JP4524402B2 - Semi-volatile organic compound (SVOC) emission measurement method and measurement apparatus - Google Patents

Description

  The present invention relates to a method and a measuring apparatus for measuring the amount of volatile organic compound (SVOC) emitted from an object to be measured installed in a chamber, and more particularly, to a quasi-volatile organic compound on the inner wall surface of the chamber. (SVOC) Adsorption amount measurement method for semi-volatile organic compounds (SVOC) that is accurate and highly accurate, requires no chamber heating or cleaning, and can measure non-destructive objects under measurement And a measuring apparatus.

  In recent years, contamination of indoor air with chemical substances such as organic compounds released from building materials, furniture, electrical products, etc. has become a social problem. The World Health Organization (WHO) classifies these chemicals into the following four groups according to the boiling point of organic compounds.

(1) Ultra (high) volatile organic compounds having a boiling point of <0-50-100 ° C. (VVOC: Very Volatile Organic Compounds)
(2) Volatile organic compounds having a boiling point of 50-100 to 240-260 ° C. (VOC: Volatile Organic Compounds)
(3) Semi-volatile organic compounds (SVOC: Semi-volatile Organic Compounds) having a boiling point of 240-260 to 380-400 ° C.
(4) Particulate organic compounds (POM: Particulate Organic Compounds) having a boiling point of> 380 ° C.

  A typical chemical substance belonging to the super volatile organic compound (VVOC) is formaldehyde, and a chemical substance belonging to the volatile organic compound (VOC) is toluene, xylene, benzene, styrene, or the like. As for the semi-volatile organic compound (SVOC), there are some plasticizers such as dioxyl phthalate (DOP), tributyl phosphate (TBP), and organophosphorus pesticides. Examples of the particulate organic compound (POM) include tricresyl phosphate (TCP) insecticide and chlorpyrifos, hoskim, pyridafenthion, and the like, which are used as an insecticide.

  In particular, extremely volatile organic compounds (VVOC) and volatile organic compounds (VOC) such as formaldehyde, toluene, and xylene are considered to be harmful to health and cause sick house syndrome. Provides guidelines for indoor concentrations of these chemical substances.

  Therefore, it is necessary to accurately and accurately measure the amount of volatile organic compound (VOC) emitted from building materials, furniture, electrical appliances, etc. (emission rate: mass of VOC emitted per unit time). As for the volatile organic compounds (VOC), as a result of the progress of standardization of measurement methods, recently, JIS-A1901 "Measurement method for emission of volatile organic compounds (VOC), formaldehyde and other carbonyl compounds in building materials" -“Small chamber method” is JIS.

  On the other hand, with regard to semi-volatile organic compounds (SVOC), these chemical substances are often contained in plastics as plasticizers and flame retardants, and among them, they exhibit endocrine disrupting action, carcinogenicity, and neurotoxicity. There are also things. In addition, since they are released into the room despite having a higher boiling point than volatile organic compounds (VOC), they are concerned as chemical substances that may affect health in the same way as volatile organic compounds (VOC). ing.

In general, the principle of the method for measuring the amount of chemical emission is explained as follows.
First, it is assumed that an object to be measured is installed in a room, and when a chemical substance is diffused from the object to be measured, it immediately and uniformly diffuses and is completely mixed in the air. This concentration is defined as instantaneous uniform diffusion concentration (completely mixed concentration) C (μg / m ³ ). The instantaneous uniform diffusion concentration C is given by the following equation (1).
C = (E × u) / Q (1)
Here, E is the diffusion rate per unit (μg / (unit · h)), u is the number of units to be measured (unit), and Q is the volume of air supplied into the room per unit time (m ³ / h), ie, ventilation.

In practice, the chemical substance diffused from the object to be measured does not diffuse instantaneously and almost has a concentration distribution in the room. However, the chemical conservation laws in the indoor outlet mean concentration C _o of the exhaust port will always be consistent with the ideal instantaneous uniform diffusion concentration C.

Here, if the diffused chemical substance is not adsorbed on the wall surface of the room such as volatile organic compound (VOC), it reaches the indoor exhaust port with the instantaneous uniform diffusion concentration C. When the average outlet concentration C _o (μg / m ³ ) is measured, an instantaneous uniform diffusion concentration C can be obtained (C = C _o ).

Measurement of outlet mean concentration C _{o (μg} / m ^3), for example, to place the collecting tube to the exhaust port, a predetermined time t (min) at a constant aspiration flow q (m 3 ^/ min) at a suction pump sucks To collect air. Then, the mass m (μg) of the chemical substance trapped in the collection tube is quantified with a measuring instrument. The outlet average concentration C _o (μg / m ³ ) is obtained from the following equation (2).
C _o = m / (t × q) (2)

  However, unlike the volatile organic compound (VOC), most of the emitted chemical substance is adsorbed on the indoor wall surface under the room temperature condition, unlike the volatile organic compound (VOC). For this reason, even if the concentration is measured at the exhaust port, it can hardly be detected, and it is difficult to accurately measure the amount of emission. Therefore, the small chamber method of JIS-A1901 cannot be applied as it is to the measurement of semi-volatile organic compounds (SVOC).

Therefore, a test piece is placed in a small chamber and the whole chamber is heated and measured, or a so-called screening method, or after placing the test piece in a small chamber, the chamber is ventilated to collect the emitted gas, Take out the test piece, heat the chamber while supplying purge gas into the empty chamber, and release (desorb) the quasi-volatile organic compound (SVOC) adsorbed on the inner wall surface of the chamber, so-called adsorption in the chamber -A method for measuring a semi-volatile organic compound (SVOC) such as a heat desorption method has been proposed (see, for example, Patent Document 1 and Non-Patent Document 1).
International Publication No. 03/048738 Pamphlet Zhu Qingyu, Kunihiro Hoshino, Shinsuke Kato, Yuji Anya, “Development of a method for measuring volatile organic compounds (SVOCs) emitted from materials under room temperature conditions”, Architectural Institute of Japan Proceedings, No. 574, pp. 35-41, December 2003

  However, in any of the above conventional methods, the object to be measured is a test piece obtained by taking out or cutting a part of an indoor product such as an electric appliance or furniture, and measuring a full-size indoor product in a non-destructive manner. It wasn't the way. For example, in the screening method described above, if the chamber is enlarged and an attempt is made to measure a full-size indoor product instead of a test piece, the indoor product in the chamber is also hot and damaged, so it cannot be applied. There was a problem.

  Further, in the above-described in-chamber adsorption-heat desorption method, it is necessary to heat the large chamber after taking out the indoor product. However, it is extremely difficult to uniformly desorb this semi-volatile organic compound (SVOC) adsorbed on the inner wall surface of the chamber by uniformly heating the large chamber.

  An alternative method is to clean the chamber with a solvent, etc., elute the components adsorbed on the wall surface, and analyze it. It is extremely difficult to elute the compound (SVOC) completely. Therefore, the above-described method for collecting and analyzing the components adsorbed on the inner wall surface of the chamber is not practical from the viewpoint of cost and labor, and has a problem that it is difficult to apply.

  That is, since the semi-volatile organic compound (SVOC) is easily adsorbed on the inner wall surface of the chamber as described above, it is difficult to measure with high accuracy with the conventional method.

  As described above, an effective measuring method and measuring apparatus that accurately and accurately measures a full-scale indoor product in a non-destructive state is still proposed for measuring the amount of volatile organic compound (SVOC) emitted. It has not been.

  In view of the above-mentioned problems of the prior art, the present invention has less measurement error due to adsorption of the semi-volatile organic compound (SVOC) to the inner wall surface of the chamber, is accurate and highly accurate, and does not require heating or cleaning of the chamber. An object of the present invention is to provide a method and an apparatus for measuring the emission amount of a semi-volatile organic compound (SVOC) capable of measuring a measurement object in a nondestructive manner.

To solve this problem,
The invention according to claim 1 is a method for measuring the amount of quasi-volatile organic compound dissipated from an object to be measured installed in a chamber, wherein the air flow in the chamber is analyzed by hydrodynamic simulation, The step (a) of identifying a region where the concentration of the chemical substance diffused from the object to be measured installed in the chamber is 100 ± 1 to 20% when the instantaneous uniform diffusion concentration is 100; When the measured object is placed in a chamber and ventilated, and the instantaneous uniform diffusion concentration is 100, air in a region of 100 ± 1 to 20% is collected and contaminated with the semi-volatile organic compound. It has a process (b) which measures a density | concentration, It is a emitted amount measuring method of the semivolatile organic compound characterized by the above-mentioned.

  According to a second aspect of the present invention, the object to be measured is at least one room selected from the group consisting of furniture, joinery, furniture, office furniture, office joinery, home appliances, office equipment, and building equipment. The method for measuring the emission amount of a semi-volatile organic compound (SVOC) according to claim 1, which is a product.

  The invention according to claim 3 is the method for measuring a volatile organic compound (SVOC) emission amount according to claim 1 or 2, wherein the airflow and ventilation in the chamber are vertical laminar flows.

According to a fourth aspect of the present invention, there is provided an apparatus for measuring the amount of volatile organic compound (SVOC) diffused from an object to be measured installed in a chamber, wherein the air flow in the chamber and the concentration distribution of the emitted chemical substance Is installed, and a fluid dynamics simulation device for specifying a region of 100 ± 1 to 20% when the instantaneous uniform diffusion concentration is set to 100, and the object to be measured including an air supply port and an exhaust port are installed. The chamber, a collection tube for sucking and collecting air in an area of 100 ± 1 to 20% when the instantaneous uniform diffusion concentration in the chamber is 100, and a collection tube from the collection tube introducing the air that has condensed, the a diffusion amount measuring device of quasi-volatile organic compound (SVOC) semi volatile organic compounds characterized in that a measuring device for measuring the pollutant concentration of (SVOC).

  According to a fifth aspect of the present invention, in the chamber, the air supply port is provided on the entire floor surface excluding an area where the object to be measured is installed, and the exhaust port is provided on the entire ceiling surface. 4 is a device for measuring the amount of emitted volatile organic compounds (SVOC) according to 4.

  According to the method and apparatus for measuring the amount of volatile organic compound (SVOC) emitted according to the present invention, the phenomenon of adsorbing the air flow in the chamber and the concentration distribution of the emitted chemical substance on the inner wall of the chamber is reproduced by fluid dynamics simulation. Analysis, and when the instantaneous uniform diffusion concentration is defined as 100, an area of 100 ± 1 to 20% is specified, and then air is actually collected in the specific area, and a semi-volatile organic compound ( (SVOC) contamination concentration is measured, measurement errors due to adsorption of semi-volatile organic compounds (SVOC) to the inner wall of the chamber are reduced, accurate and high accuracy, and without heating or cleaning the chamber. The measurement object can be measured without breaking.

  Hereinafter, an example of a device for measuring the amount of volatile organic compound (SVOC) emission according to an embodiment of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic configuration diagram of a semi-volatile organic compound (SVOC) emission measurement apparatus 1 according to the first embodiment.

  A dissipating amount measuring apparatus 1 according to the present embodiment includes a fluid dynamics simulation apparatus (not shown), a chamber 2 provided with an air supply port 5 and an exhaust port 6 in which an object to be measured 4 is installed, and an analyzer 3 It is roughly structured.

  In the fluid dynamics simulation, the air flow in the chamber 2 is analyzed by a personal computer, a large computer or the like incorporating commercially available computational fluid dynamics (CFD) simulation software, and the object 4 to be measured is installed in the chamber 2. The concentration distribution of the chemical substance released from the measurement object 4 when ventilated can be theoretically analyzed including the phenomenon that the semi-volatile organic compound (SVOC) is adsorbed on the inner wall surface of the chamber.

The chamber 2 used in this embodiment is made of a metal such as a rectangular parallelepiped stainless steel having a width (W) of 2700 mm, a depth (D) of 2700 mm, and a height (H) of 2400 mm, and can be sealed. The inner surface may be left as it is, or may be coated with glass or quartz. The chamber 2 has a volume of about 17.5 m ³ and corresponds to a living room with a size of 4 tatami mats. Therefore, the chamber 2 (for example, width (w) 600 mm, depth (d) 1200 mm, height (h) 600 mm) and chest ( For example, the device under test 4 having a width (w) of 600 mm, a depth (d) of 1200 mm, and a height (h) of 1800 mm) can be installed as it is.

  The chamber 2 can control the internal temperature, humidity, and ventilation volume. A 220 mm × 220 mm square air supply port 5 and an exhaust port 6 for ventilation are diagonally arranged on the ceiling surface. Is provided.

  The analyzer 3 includes a collection tube 7 such as a Tenax-TA adsorption tube for collecting air, a gas chromatograph (GC / FID) with a flame ionization detector, and a gas chromatograph mass spectrometer (GC / MS). ) And the like measuring instrument 8.

  The collection tube 7 is configured such that after the air in the chamber is sucked and collected by a pump, the air is released and introduced into the measuring device 8. The measuring device 8 is a kind of so-called commercially available analytical instrument, and can quantitate the contamination concentration of the semi-volatile organic compound (SVOC) in the collected air.

  In the measuring apparatus 1 according to the present embodiment, by increasing the size of the chamber 2, the measurement object 4 can be housed and measured without being destroyed.

  Next, a method for measuring the amount of emitted quasi-volatile organic compound (SVOC) according to this embodiment will be described. This method for measuring the amount of emissions is based on the computer simulation, in which an area of 100 ± 1 to 20% is specified in advance when the instantaneous uniform diffusion concentration is 100, and the actual air collection is specified. In this area, the contamination concentration of the semi-volatile organic compound (SVOC) is measured, and from this the amount of emission of the semi-volatile organic compound (SVOC) of the object to be measured (emission rate per unit number) is calculated. Yes, measurement errors due to adsorption to the inner wall surface of the chamber are reduced, and accurate and highly accurate measurement is possible.

  FIG. 2 is a process diagram showing a method for measuring the amount of emission of a semi-volatile organic compound (SVOC) according to this embodiment. The semi-volatile organic compound (SVOC) emission amount measuring method according to the present embodiment is roughly composed of steps a to o.

  The objects to be measured are non-destructive indoor products such as plastic and surface-coated metal, and building equipment. For example, furniture, furniture for homes, offices, educational facilities, public facilities, and stores And indoor products such as electrical appliances such as joinery, home appliances, office equipment, and OA equipment.

  Specifically, chests, bookshelves, bookcases, cupboards, shelves, Buddhist tools, beds, counters, desks, tables, sideboards, lockers, racks, chairs, benches, sofas, stools, blackboards, bulletin boards, stands, hangers, cases Furniture, furniture such as storage, wagons, carriers, etc .; furniture such as partitions, partitions, shoji screens, bags, doors, etc .; AV equipment such as TV, audio, video, digital camera, DVD, home game machine, telephone, washing machine General household appliances such as dryers, vacuum cleaners, refrigerators, cooking utensils, lighting fixtures, and air conditioners; office equipment such as personal computers, facsimiles, printers, copiers, scanners, shredders, projectors, and OA equipment It is done.

  Among these, one or more indoor products selected from the group consisting of furniture, joinery, furniture, office furniture, office joinery, home appliances, office equipment, and building equipment are preferable.

  Step (a) is composed of steps a to c shown in FIG. 2, and analyzes the air flow in the chamber by hydrodynamic simulation and takes into account the phenomenon that chemical substances are adsorbed on the inner wall surface of the chamber. By analyzing the concentration distribution of the chemical substance diffused from the object to be measured, the region where the concentration is 100 ± 1 to 20% when the instantaneous uniform diffusion concentration is 100 is specified.

  First, in step A shown in FIG. 2, flow field analysis (air flow analysis) is performed using a fluid dynamics simulation apparatus. In the flow field analysis, there is no emission of chemical substances from the object to be measured, and only the flow of airflow in the chamber is analyzed. The process A and the next process A are collectively referred to as CFD analysis. Table 1 shows specific conditions of the CFD analysis case.

In the present embodiment, CFD analysis is performed for cases 1 to 4. Each of the cases 1 to 4 is a model in which a 220 mm × 220 mm square air supply port 5 and an exhaust port 6 are provided diagonally on the ceiling surface of the chamber 2 shown in FIG. The object 4 is a television of 600 mm × 1200 mm × 600 mm (surface area 2.88 m ² ), and the case 1 is a volatile organic compound (VOC) that does not adsorb diffused chemical substances on the ceiling surface, floor surface, and wall surface of the chamber. This is the case, and Case 2 is a case of a semi-volatile organic compound (SVOC) to be adsorbed.

Cases 3 to 4 have a measurement object 4 having a diameter of 600 mm × 1200 mm × 1800 mm (surface area 7.2 m ² ), and case 3 adsorbs a diffused chemical substance on the ceiling surface, floor surface, and wall surface of the chamber. This is the case for volatile organic compounds (VOC), and Case 4 is the case for adsorbing semi-volatile organic compounds (SVOC).

Here, the loading factor (LF) is a numerical value (m ² / m ³ ) obtained by dividing the surface area of the object to be measured by the chamber volume, which is 0.165 for television and 0.412 for chest. The ventilation frequency (times / h) refers to a value obtained by dividing the volume of the air (ventilation amount) supplied to the chamber per unit time by the chamber volume. In this embodiment, LF / N, which is a value obtained by dividing the number of ventilations, the blowing speed from the air supply port 5, and the loading factor (LF) by the number of ventilations, is the conditions shown in Table 1.

Further, the conditions shown in Table 2 are used as the CFD analysis conditions of the present embodiment. The turbulence model is a low Re-type k-ε model (Abe-Nagano model), the algorithm is SIMPLE method, the difference scheme is QUICK (k, ε is first-order accuracy upwind), and the inflow boundary condition is U _in = 0.05 m / S etc. are used.

  FIG. 3 is a schematic diagram showing a flow field in the chamber by CFD analysis in Case 3 of Table 1. According to FIG. 3, the turbulence of the airflow has occurred, and the stay area 10 is observed near the left floor surface from the chance and the flow field of the circulating flow 11 is observed near the right center.

  Next, in step (a) shown in FIG. 2, the theoretical distribution (diffusion field) of the concentration distribution of the chemical substance dissipated from the object to be measured is taken into consideration while adsorbing the semi-volatile organic compound (SVOC) on the inner wall surface of the chamber. To analyze. In addition, about a volatile organic compound (VOC), it is not necessary to consider adsorption | suction to the inner wall surface of a chamber.

  At this time, the diffusion surfaces from the object to be measured are the five surfaces excluding the bottom surface, and are the surfaces 41 to 45 shown in FIG. In addition, an example in which pure water is used as the emission chemical substance will be described so that calculation is easy. In addition, it is the same even if it analyzes using what kind of substance other than a pure water.

Specifically, as shown in the bottom column of Table 2, the saturated gas phase concentration (27.7 g / m ³ ) of pure water is given to the surface (41 to 45) of the object to be measured, and the diffusion coefficient is 2. The calculation is performed assuming that 66 × 10 ⁻⁵ m ² / s, the temperature in the chamber is constant at 28 ° C., and the object to be measured does not generate heat. At this time, the presence / absence of adsorption to the inner wall surface of the chamber can be taken in as a parameter.

  Next, in the step C shown in FIG. 2, the region of 100 ± 1 to 20% when the instantaneous uniform diffusion concentration is set to 100 out of the concentration of the obtained chemical substance is specified on the computer screen. To display. If the error is not so much a problem, it can be performed in the region of 100 ± 1 to 20% when the instantaneous uniform diffusion concentration is set to 100 as in the present embodiment, but the error is further reduced. If there is, the region may be 100 ± 10% when the instantaneous uniform diffusion concentration is 100.

  FIG. 4 is a schematic diagram showing a region of 100 ± 10% when instantaneous uniform diffusion concentration is set to 100 out of the radiation from the television in the chamber by CFD analysis. When there is no wall surface adsorption of case 1, (b) is a schematic diagram when there is wall surface adsorption of case 2 of Table 1. FIG. Here, the region indicated by reference numeral 20 is a region that becomes 100 ± 10% when the instantaneous uniform diffusion concentration is 100.

  According to FIG. 4, in the case where there is no wall surface adsorption in (a), a region 20 that is 100 ± 10% when the instantaneous uniform diffusion concentration is set to 100 is considerably widened in the chamber 2. When the wall surface adsorption of (b) is present, a region 20 that is 100 ± 10% when the instantaneous uniform diffusion concentration is 100 is slightly present in the vicinity of the periphery of the DUT 4.

  FIG. 5 is a schematic diagram showing a region of 100 ± 10% when the instantaneous uniform diffusion concentration is set to 100 out of the radiation from the chance in the chamber by CFD analysis. When there is no wall surface adsorption of the case 3 of FIG. 1, (b) is a schematic diagram when the wall surface adsorption of the case 4 of Table 1 exists.

  In the case of the case, as in the case of the television, when the wall surface adsorption shown in FIG. 5B is present, the region 20 which is 100 ± 10% when the instantaneous uniform diffusion concentration is 100 is the vicinity of the object 4 to be measured. Exists.

  From the results shown in FIGS. 4 and 5, in the case of a chemical substance having a wall surface adsorptivity, the concentration is reduced in the vicinity of the exhaust port 6 of the chamber, and the region is 100 ± 10% when the instantaneous uniform diffusion concentration is 100. 20 is specified to be near the periphery of the DUT 4.

Next, step (b) corresponding to actual measurement is performed. Step (b) is composed of the steps E to E shown in FIG. 2. When the object to be measured is actually placed in the chamber for ventilation and the instantaneous uniform diffusion concentration is 100, 100 ± 1 collecting the air in the area to be 20%, and measures the pollutant concentration C _m of semi volatile organic compounds (SVOC).

  First, in step D shown in FIG. 2, the object to be measured is placed in the chamber. This chamber is shown in FIG.

  Next, in the process O shown in FIG. 2, the inside of the chamber is ventilated. The ventilation conditions are the same as those shown in Table 1. Then, when the instantaneous uniform diffusion concentration specified in the step C is set to 100, the air is sucked with a pump in a region of 100 ± 1 to 20% and is collected in a collection tube such as a Tenax-TA adsorption tube. Gather.

In step mosquitoes shown in FIG. 2, by releasing the air collected from the collecting tube, it is introduced into a gas chromatograph mass spectrometer (GC / MS), the pollutant concentration C _m of semi volatile organic compounds (SVOC) Quantify. Semi-volatile organic compounds (SVOC) to be measured are phthalate esters such as dibutyl phthalate (DBP) and di-2-ethylhexyl phthalate (DEHP); adipic acid such as adipic acid-2-ethylhexyl (DOA) Esters; Phosphate esters such as tributyl phosphate (TBP) and tri (chloroethyl) phosphate (TCEP); Aliphatic hydrocarbons such as dibutylhydroxytoluene (BHT), siloxane hexamer (D6), hexadecane and eicosane; 2-ethyl Examples include alcohols such as -1-hexanol.

Pollutant concentration C _m of the semi-volatile organic compounds (SVOC) is specified in step c, since is in the air in the collection regions in step o, the instantaneous uniform diffusion concentration C is 100 , Corresponding to the concentration of 100 ± 1% to 20%, corresponding to the outlet average concentration _Co at the exhaust port 6. In the step O shown in FIG. 2, the contamination concentration C _m (μg / m ³ ) is applied to the following formula (3) derived from the above formula (1), and the emission rate E (μg / ( unit · h)).
E = (C _m × Q) / u (3)
Here, similarly to the above formula (1), u is the number of measured objects (unit), and Q is the ventilation volume (m ³ / h). The obtained error of the diffusion rate E per unit is ± 1 to 20%.

  According to the measurement method according to the present embodiment, the region that is 100 ± 1 to 20% when the instantaneous uniform diffusion concentration is set to 100 is specified in advance by hydrodynamic simulation. By collecting the air with, the measurement can be performed with almost no influence by the adsorption of the semi-volatile organic compound (SVOC) onto the inner wall surface of the chamber. As a result, the measurement error can be reduced, and the semi-volatile organic compound (SVOC) can be measured accurately and with high accuracy.

  Further, in the measurement method according to the present embodiment, measurement can be performed almost without being affected by the adsorption of the semi-volatile organic compound (SVOC) to the inner wall surface of the chamber. It is not necessary to desorb the components adsorbed by heating and to collect the components, or to clean the chamber with a solvent and elute the components adsorbed on the wall surface for analysis. For this reason, it can be simplified as compared with the conventional method in terms of energy cost and labor, and can be easily applied to a large chamber.

  Further, in the measurement method according to the present embodiment, the object to be measured is placed in the chamber in a non-destructive state and can be measured at room temperature, so that the object to be measured is not damaged or adversely affected, and after the measurement is completed. The object to be measured can be used as usual.

  In this embodiment, the chemical substance to be measured is a semi-volatile organic compound (SVOC), but can be applied to measurement of other chemical substances. For this reason, the supervolatile organic compound (VVOC) and the volatile organic compound (VOC) can be measured in consideration of the degree of adsorption to the inner wall surface of the chamber simultaneously with the semi-volatile organic compound (SVOC).

  Further, in the present embodiment, in the diffusion field analysis of step (b) shown in FIG. 2, the diffusion concentration of the chemical substance from the diffusion surface of the object to be measured is assumed to be the same for all five surfaces (41 to 45). . However, if the emission concentration from a specific part of the object to be measured is higher than that of the remaining part, the error becomes large with this assumption. In such a case, measure the diffused concentration of the high and low diffused portions in the measured object in advance, and give the parameters that reflect the difference to the diffusion field analysis for calculation. As a result, it is possible to reduce the error of the final emission amount.

[Second Embodiment]
FIG. 6 is a schematic configuration diagram of the chamber 2 of the apparatus for measuring a volatile organic compound (SVOC) emission amount according to the second embodiment. Since the diffused amount measuring apparatus according to this embodiment is the same except that the shape and position of the air supply port 5 and the exhaust port 6 of the chamber 2 are different from those of the first embodiment, description thereof will be omitted.

  In the chamber 2 according to the present embodiment, the air supply port 5 is provided on the entire floor surface excluding the area where the measurement object 4 is installed, and the exhaust port 6 is provided on the entire ceiling surface. For example, the floorboard may be grating and the ceiling board may be punched. The arrows in FIG. 6 indicate the air flow.

  By providing the air supply port 5 on the floor and the exhaust port 6 on the ceiling surface, the airflow can flow only in one direction from the bottom to the top. In addition, an air supply / exhaust port is provided on almost the entire surface of the floor and the ceiling so that the air flow does not stay in the chamber 2.

  Since the method for measuring the amount of emission according to this embodiment is the same as that of the first embodiment except that the conditions of the CFD analysis case shown in Table 3 are used, the description thereof is omitted. Table 3 shows each condition of the CFD analysis case of the method for measuring the amount of emission according to the present embodiment. In this case, wall surface adsorption is considered to be only the wall surface excluding the ceiling surface and floor surface of the chamber.

In Table 2, the inflow boundary U _in = 0.000034 m / s is used. FIG. 7 is a schematic diagram showing a flow field in the chamber by CFD analysis in Case 7 of Table 3. As can be seen from FIG. 7, the air flow in the chamber 2 is a vertical laminar flow 12.

  FIG. 8 is a schematic diagram showing a region of 100 ± 10% when instantaneous uniform diffusion concentration is set to 100 out of the radiation from the television in the chamber by CFD analysis. When there is no wall surface adsorption of case 5, (b) is a schematic diagram when there is wall surface adsorption of case 6 of Table 3.

  According to FIG. 8, when (a) and (b) assume that the instantaneous uniform diffusion concentration is 100, there is no difference in the region 20 which is 100 ± 10%, and this region 20 is the ceiling surface. The exhaust port 6 is reached.

  FIG. 9 is a schematic diagram showing a region of 100 ± 10% when the instantaneous uniform diffusion concentration is set to 100 out of the radiation from the chance in the chamber by CFD analysis. When there is no wall surface adsorption of case 3 of FIG. 3, (b) is a schematic diagram when there is wall surface adsorption of case 8 of Table 3.

  In the case of FIG. 9 as well, there is almost no difference between (a) and (b). From the results of FIGS. 8 and 9, when the air supply port 5 is provided on the floor surface, the exhaust port 6 is provided on the entire ceiling surface, and the air flow is a vertical laminar flow, it is hardly affected by the wall surface adsorption and the chemical substance is adsorbed. When the instantaneous uniform diffusion concentration is 100, the region 20 that is 100 ± 10% is specified to be in the vicinity of the exhaust port 6 on the ceiling surface. Therefore, in the present embodiment, air is collected near the exhaust port 6.

  In the measuring apparatus according to the present embodiment, the air supply port 5 is provided in the chamber 2 over the entire floor surface excluding the area where the object to be measured 4 is installed, and the exhaust port 6 is provided over the entire ceiling surface so that the airflow is vertical. It can be laminar. As a result, since the airflow and ventilation in the chamber can be a vertical laminar flow, the chemical substance released from the object to be measured reaches the exhaust port 6 without being adsorbed on the inner wall surface of the chamber. Therefore, the emission amount of the semi-volatile organic compound (SVOC) can be measured more accurately and accurately without being affected at all by the adsorption to the wall surface.

  In the present embodiment, a vertical laminar airflow is used, but the effect of wall surface adsorption can be reduced by providing slit-like exhaust ports at the four corners of the chamber to form a spiral flow field.

  Hereinafter, the present invention will be described in more detail by way of examples. The present invention is not limited to the following examples.

[Example 1]
A large stainless steel chamber having a width (W) of 2700 mm, a depth (D) of 2700 mm, and a height (H) of 2400 mm was prepared. The floorboard was grating, the ceiling board was punched, and the floor was supplied with air and the ceiling was exhausted. One television having a width (w) of 600 mm, a depth (d) of 1200 mm, and a height (h) of 600 mm was installed in the chamber.

  CFD analysis was performed under the conditions shown in Table 2. When the ventilation rate is 0.5 (times / h), the blowout speed from the air supply port 5 is 0.00034 m / s, LF / N is 0.329, wall surface adsorption is taken, and the instantaneous uniform diffusion concentration is 100 , The area of 100 ± 10% was calculated. When this instantaneous uniform diffusion concentration is 100, the region of 100 ± 10% is the same as FIG. 8B.

  Actual air collection was performed in the region specified by the above calculation. The temperature in the chamber was 28 ° C., the humidity was 50%, the ventilation frequency, and the blowing speed were the same as in the CFD analysis. Tenax-TA was used as the collection tube, and the collection flow rate was 200 ml / min, the collection time was 50 minutes, and 10 L.

  For the analysis, a gas chromatograph mass spectrometer (GC / MS) was used. The analysis conditions for GC / MS are as follows.

GC: HP6890
Cold trap temperature: −130 ° C. (1.5 minutes) → 50 ° C./second→250° C. (4 minutes)
Column: TC-1 (60 m × 0.25 mm × 0.25 μm)
Oven temperature: 40 ° C (5 minutes) → 10 ° C / minute → 270 ° C (21 minutes)
Detector: HP5973MSD

  FIG. 10 shows a chart of the measured total ion chromatogram (TIC). From the results of FIG. 10, the emission rate of dibutyl phthalate (DBP) is 0.6 (μg / (unit · h)), and the emission rate of 2-ethyl-1-hexanol is 0.8 (μg / (unit · h). )).

  From the above results, according to the present invention, there is almost no measurement error due to adsorption to the inner wall of the chamber without heating or cleaning the chamber, and without damaging the object to be measured. It was confirmed that the amount of volatile organic compound (SVOC) emitted can be measured.

  The quasi-volatile organic compound (SVOC) emission measuring method and measuring apparatus of the present invention are quasi-volatile organic compounds from indoor products such as electric products that use a lot of plastic materials such as personal computers, notebook computers and televisions ( It can be applied to the emission suppression of the SVOC).

It is a schematic block diagram of the emission amount measuring apparatus of the semi-volatile organic compound (SVOC) which concerns on 1st Embodiment. It is process drawing which shows the emission amount measuring method of the semi-volatile organic compound (SVOC) which concerns on 1st Embodiment. It is the schematic diagram which showed the flow field of the air in a chamber by the CFD analysis in case 3 of Table 1. FIG. It is the schematic diagram which showed the area | region which becomes 100 +/- 10% when instantaneous uniform diffusion density | concentration is set to 100 among the radiation | emission from the television in a chamber by CFD analysis, (a) is the wall surface of case 1 of Table 1 When there is no adsorption, (b) is a schematic view when there is wall adsorption of case 2 in Table 1. It is the schematic diagram which showed the area | region which becomes 100 +/- 10% when instantaneous uniform diffusion density | concentration is set to 100 among the radiation | emission from the chance in a chamber by CFD analysis, (a) is the wall surface of case 3 of Table 1 When there is no adsorption, (b) is a schematic view when there is wall adsorption of the case 4 in Table 1. It is a schematic block diagram of the chamber of the emission amount measuring apparatus of the semi-volatile organic compound (SVOC) which concerns on 2nd Embodiment. It is the schematic diagram which showed the flow field in the chamber by the CFD analysis in case 7 of Table 3. It is the schematic diagram which showed the area | region which becomes 100 +/- 10% when instantaneous uniform diffusion density | concentration is set to 100 among the radiation | emission from the television in a chamber by CFD analysis, (a) is the wall surface of case 5 of Table 3 When there is no adsorption, (b) is a schematic diagram when there is wall adsorption of the case 6 in Table 3. It is the schematic diagram which showed the area | region which becomes 100 +/- 10% when instantaneous uniform diffusion density | concentration is set to 100 among the radiation | emission from the chance in a chamber by CFD analysis, (a) is the wall surface of case 7 of Table 3 When there is no adsorption, (b) is a schematic diagram when there is wall adsorption of the case 8 in Table 3. 1 is a chart of a total ion chromatogram (TIC) measured in Example 1. FIG.

Explanation of symbols

1 Quasi-volatile organic compound (SVOC) emission measurement device 2 Chamber 3 Analysis device 4 Object to be measured 5 Air supply port 6 Air exhaust port 12 Vertical laminar flow

Claims (5)

A method for measuring the amount of volatile organic compounds emitted from an object to be measured installed in a chamber,
Analyzing the air flow in the chamber by fluid dynamics simulation, the concentration of the chemical substance released from the object to be measured installed in the chamber is 100 ± 1 to 20% when the instantaneous uniform diffusion concentration is 100 A step (a) for identifying a region to be
The object to be measured is actually placed in the chamber and ventilated, and the air in a range of 100 ± 1 to 20% is collected when the instantaneous uniform diffusion concentration is 100, and the semi-volatile organic is collected. A method for measuring the amount of emitted volatile organic compounds, comprising the step (b) of measuring the contamination concentration of a compound.   The said to-be-measured object is 1 or more types of indoor products selected from the group which consists of furniture, fittings, furniture, office furniture, office fittings, home appliances, office equipment, and building equipment. Method for measuring the emission of semi-volatile organic compounds.   The method for measuring the amount of emitted volatile organic compounds according to claim 1 or 2, wherein the air flow and ventilation in the chamber are vertical laminar flows. An apparatus for measuring the amount of volatile organic compounds emitted from an object to be measured installed in a chamber,
Analyzing the concentration distribution of the air flow and the emitted chemical substance in the chamber and specifying a region of 100 ± 1 to 20% when the instantaneous uniform diffusion concentration is 100 ;
The chamber in which the object to be measured is provided, which has an air supply port and an exhaust port;
A collection tube that sucks and collects air in an area of 100 ± 1 to 20% when the instantaneous uniform diffusion concentration in the chamber is 100 ,
Wherein the air collected from the collecting tube is introduced, the diffusion amount measuring device of quasi-volatile organic compounds characterized in that a measuring device for measuring the pollutant concentration of the semi-volatile organic compounds.   5. The semi-volatile organic material according to claim 4, wherein the chamber has the air supply port provided on the entire floor surface excluding an area where the object to be measured is installed, and the exhaust port provided on the entire ceiling surface. Compound emission measurement device.

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