JPS5858457A - Measuring electrode for ionic activity - Google Patents
Measuring electrode for ionic activityInfo
- Publication number
- JPS5858457A JPS5858457A JP15657081A JP15657081A JPS5858457A JP S5858457 A JPS5858457 A JP S5858457A JP 15657081 A JP15657081 A JP 15657081A JP 15657081 A JP15657081 A JP 15657081A JP S5858457 A JPS5858457 A JP S5858457A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- electrode
- membrane
- permeable membrane
- conductivity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/07—Construction of measuring vessels; Electrodes therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は溶液導電率測定用電極を用いて構成するガス
濃度測定用電極に関し、さらに詳しくは、溶液導電率瀘
定用電ａＩ！を置うようにガス透過性膜を設けるととも
に、仁のＷＷとガス透過性膜との間にガスＶ＆収液を充
填してなる溶液導電率型ガス濃度測定用電極に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode for measuring gas concentration constructed using an electrode for measuring solution conductivity, and more specifically, an electrode for measuring solution conductivity. This invention relates to a solution conductivity type gas concentration measuring electrode, in which a gas permeable membrane is provided so as to dispose the gas permeable membrane, and a gas V and a collected liquid are filled between the solid WW and the gas permeable membrane.
従来、膜電極にガス透過性膜をかぶせ、このガス透過性
膜を通過してくるガスをガス吸収液に吸収させ、この吸
収液のｐＨ変化をｌ１ｌＩ［極にて電位差変化として促
え、 ｃｎよタガス濃度を測定する方法があった。 し
かしながら、この方法罠おいては％測定される電位差と
ガス論度とが対数関係にある為、Ｗ位差からガス濃度を
求めるには逆対数変換ａｔ全必要する。 また、用いる
ｖＨ’ｌ極の内部抵抗が大きいため（一般的に１００Ｍ
Ω以上）高入力抵抗の増幅器が必要である等装置が祷細
となｎ、Ｉｌｌ定に手間がかかるとともにコスト高にな
る。 装置全体としてｉＭ雑となるので取扱いに注意を
要し、とくに高入力抵抗増幅−であるための絶ｌＩ＃低
下等取扱いに注意を必要とするものであった。Conventionally, a membrane electrode is covered with a gas-permeable membrane, and the gas passing through the gas-permeable membrane is absorbed into a gas absorption liquid, and the pH change of the absorption liquid is induced as a potential difference change at the electrode. There was a method to measure the concentration of yotagus. However, in this method, since the measured potential difference and the gas temperature are in a logarithmic relationship, inverse logarithmic transformation is necessary to obtain the gas concentration from the W potential difference. In addition, since the internal resistance of the vH'l pole used is large (generally 100M
Ω or more) requires an amplifier with a high input resistance, etc., and the equipment is very detailed, making it time-consuming and expensive. Since the device as a whole is complicated, care must be taken when handling it, and in particular, due to the high input resistance amplification, there is an absolute drop in II#.
この発明は上記の従来法の欠点を解消するべくなされ九
もので、溶液導電率測定用電極管用いてガス濃度ｔｍ定
しようとするものである。This invention was made in order to eliminate the drawbacks of the above-mentioned conventional method, and attempts to determine the gas concentration tm using an electrode tube for measuring solution conductivity.
以下この発明を実施例に基づいて詳述するものであるが
、この発明は下記実施例に限定されるものではない。This invention will be described in detail below based on Examples, but this invention is not limited to the Examples below.
第１図はこの発明の溶液導電率型ガス濃度測定用電極（
１）を示すもので、溶液導電率測定用電極（２）を櫃う
ようにガス透過性膜（Ｊが設けられて構成さレテイる。Figure 1 shows the solution conductivity type gas concentration measuring electrode (
1), the gas permeable membrane (J) is provided so as to cover the electrode (2) for measuring solution conductivity.
ｆ７ｆ＆導電率測５１１１１［Ｆｊｉ！、（２１ｆ
ｌ、 Ｉｊ板（（転）。f7f & conductivity measurement 51111 [Fji! , (21f
l, Ij board ((transfer).
（４と、この極板（４１、（４１を埋設して支持する支
持管（Ｓと、リード線（８、（６）とからなるもので、
従来の溶液導電率測定用電極においては極板を支持管よ
り突出させて支持していたのに対し、支持管（９面と下
端部が面一となるように極板（４） 、 （４１′ｇ！
−設けている。 こｎはガス透過性ＩＩ（ａ）が納まり
よく、支持管（劫との間に適当な空隙を作るように設け
られるべくｕしたものである。 ガス透過性ｊｉｌ（３
１としては２声〜１００声厚程度のテフロン、ポリプロ
ピＶン、シリコーン等の疎水性高分子膜が用いられ、ガ
ス吸収液の充填は実際にはこのガス透過性膜（（至）の
内向に滴下しておこなわれるもので、ガス透過性膜（３
）は０リング（ηにより支持管（ジに取り付けられる。(4), this electrode plate (41, (41) is buried and supported by a support tube (S), and lead wires (8, (6).
In conventional electrodes for measuring solution conductivity, the electrode plate was supported by protruding from the support tube, whereas the electrode plate (4), (41 'g!
- Yes. This is shaped so that the gas permeability II (a) can be accommodated well and it can be installed to create an appropriate gap between the support tube (kalpa). Gas permeability jil (3)
As 1, a hydrophobic polymer membrane such as Teflon, polypropylene V, silicone, etc. with a thickness of 2 to 100 mm is used, and the gas absorbing liquid is actually filled in the inward direction of this gas permeable membrane. This is done by dropping a gas permeable membrane (3
) is attached to the support tube (ji) by the O-ring (η).
この取り付けの際ガス透過性膜（鵠のガスｇ！に収液
部分の厚みが２声〜１ｏ戸程度に保′たれるようにする
ものである。During this installation, the thickness of the gas-permeable membrane (gas-permeable membrane) should be maintained at a level of about 2 mm to 1 mm.
以下この発明の実施例を使用しておこなうアンモニヤガ
ス嬢度測定について示す。Ammonia gas resistance measurement performed using an embodiment of the present invention will be described below.
ガス＠収液としては塩化アンモニウム水溶液を用いるも
ので、ガス透過膜を透過したアンモニヤガスは塩化アン
モニウふ水＃液と次式のように反応し、水酸化アンモニ
ウム（ＮＨ２ＯＨ）１生成し平衡状態となる。An ammonium chloride aqueous solution is used as the gas @recovered liquid, and the ammonia gas that has passed through the gas permeable membrane reacts with the ammonium chloride solution as shown in the following formula, producing ammonium hydroxide (NH2OH)1 and reaching an equilibrium state. Become.
ＭＨ，十ＭＭ４０１＋Ｈ，Ｏ＃ Ｍｌｌ、Ｏｆ＋Ｈ１３
，ＯＨ生成する水酸化アンモニウム１には？７＆測定ガ
スであるアンモニヤガス濃度に可逆的に比例する。 す
なわち、アンモニヤガスｌｌｌ５が大であれば生成され
る水酸化アンモニウムの量も多くなり、アンモニヤガス
濃度が小であれば水酸化アンモニウムの量も少なくなる
。MH, 10MM401+H,O# Mll, Of+H13
, for ammonium hydroxide 1 that produces OH? 7 & Reversibly proportional to the concentration of ammonia gas, which is the measurement gas. That is, if the ammonia gas lll5 is large, the amount of ammonium hydroxide produced will be large, and if the ammonia gas concentration is small, the amount of ammonium hydroxide will be small.
一方溶液導電率電極で測定されるガス吸収液の溶液電導
率（Ｕ） Ｆ１次式で示されるように生成される水酸化
アンモニウムの量に比例する。On the other hand, the solution conductivity (U) of the gas-absorbing liquid measured with a solution conductivity electrode is proportional to the amount of ammonium hydroxide produced as shown by the linear equation F.
ＬＦ＝ ＫＭ１３，０１− ＯＮＨ，Ｏｆ＋ＫＭＨ，Ｏ
Ｈ−ＣＭＨ，ＯＨ従がってガスＩ＆暇液の溶液導電率変
化を測定することによつ″ｃｆ＆測定ガスであるアンモ
ニヤガス濃度を求めることができるものである。LF=KM13,01-ONH,Of+KMH,O
H-CMH,OH Therefore, by measuring the change in the solution conductivity of the gas I and the free liquid, it is possible to determine the concentration of the ammonia gas, which is the cf and measurement gas.
ガスｒＩｋ収液としてはガスｇ＆収に伴なう溶液導電率
変化の大きい溶液を、測定ガス圧対応させて適宜選択し
て用いるもので、アンモニヤガスの＊−ｅは上紀塩化ア
ンモニウム水溶液の他に炭酸水素方トリウム水溶液を用
い、炭酸ガスの場合−炭酸水素ナトリウム水溶液を用い
る。As the gas rIk collection liquid, a solution with a large change in solution conductivity due to gas g& collection is appropriately selected and used in accordance with the measured gas pressure. For carbon dioxide, a thorium aqueous solution is used, and for carbon dioxide, a sodium hydrogen carbonate aqueous solution is used.
第１図に示した実施例においては極板を２個用い７ｔも
のを示し友が、溶液導電率測定用Ｗ極には極板が３個の
もの４個のものがあるので、この発明においても七ｎら
の使用が可能である。In the embodiment shown in FIG. 1, a 7-ton electrode using two electrode plates is shown. However, W electrodes for solution conductivity measurement include three electrode plates and four electrode plates, so in this invention, It is also possible to use Nana et al.
この発明は上述のように構成されている−ので。This invention is constructed as described above.
この発明によれば溶液導電率より直線関係におい−でガ
ス濃度逼得られるので逆対数変換器を用いる必要がなく
、また内部抵抗も大とならないので増幅器４必要とせず
、全体＃４Ｆｌｔが簡単とな９取り扱いが容易に＠ると
ともにコスト安に提供できるものである。 さらにこの
発明を溶液の導電率測定に用い九場合、ガス体のみに感
応するので共存の液体成分の妨害が少なく、選択性のあ
る測定が１１能になるという付加的効果も発揮するもの
でおる。According to this invention, the gas concentration can be obtained in a linear relationship from the solution conductivity, so there is no need to use an anti-logarithm converter, and the internal resistance is not large, so the amplifier 4 is not required, and the overall #4Flt is simple. It is easy to handle and can be provided at low cost. Furthermore, when this invention is used to measure the conductivity of a solution, it has the additional effect of being sensitive to gas only, so there is less interference from coexisting liquid components, and selective measurement becomes possible. .
ｗＬ１図はこの発明の実施例の一部切欠ｗｈ向図である
。
（１）・・・・廖液導電率型ガス濃度測定用ｆ極、（３
・・・・溶液導電率測定用電極、
（（至）・・・・ガス透過性展
第１図Figure wL1 is a partially cutaway wh-direction view of an embodiment of the present invention. (1)...F-pole for liquid conductivity type gas concentration measurement, (3
... Electrode for measuring solution conductivity, ((to) ... Gas permeability exhibition Figure 1
Claims (1)
膜を設けるとともに、この電極とガス透過性膜との間に
ガス゛吸収液を充填してなる浴液導電率型ガス濃度測定
用［ｆＭ。L For bath liquid conductivity type gas concentration measurement [ fM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15657081A JPS5858457A (en) | 1981-09-30 | 1981-09-30 | Measuring electrode for ionic activity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15657081A JPS5858457A (en) | 1981-09-30 | 1981-09-30 | Measuring electrode for ionic activity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5858457A true JPS5858457A (en) | 1983-04-07 |
| JPS6236172B2 JPS6236172B2 (en) | 1987-08-05 |
Family
ID=15630654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15657081A Granted JPS5858457A (en) | 1981-09-30 | 1981-09-30 | Measuring electrode for ionic activity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5858457A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01314767A (en) * | 1988-06-08 | 1989-12-19 | Kato Seikosho:Kk | Knotting structure of fishing net, knitting of said net knitting thereof and net knitting device therefor |
| US7622304B2 (en) | 1998-07-17 | 2009-11-24 | Alertis Medical As | Carbon dioxide sensor and method of determining partial pressure of carbon dioxide |
| US7826880B2 (en) | 2004-07-16 | 2010-11-02 | Alertis Medical As | Electrochemical sensor for in-vivo or ex-vivio measurements of the carbon dioxide partial pressure of living tissue |
| JP2014006128A (en) * | 2012-06-22 | 2014-01-16 | Omron Corp | Gas sensor and gas sensing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5098396A (en) * | 1973-12-21 | 1975-08-05 |
-
1981
- 1981-09-30 JP JP15657081A patent/JPS5858457A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5098396A (en) * | 1973-12-21 | 1975-08-05 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01314767A (en) * | 1988-06-08 | 1989-12-19 | Kato Seikosho:Kk | Knotting structure of fishing net, knitting of said net knitting thereof and net knitting device therefor |
| US7622304B2 (en) | 1998-07-17 | 2009-11-24 | Alertis Medical As | Carbon dioxide sensor and method of determining partial pressure of carbon dioxide |
| US8003401B2 (en) | 1998-07-17 | 2011-08-23 | Alertis Medical As | Carbon dioxide sensor and method of determining partial pressure of carbon dioxide |
| US7826880B2 (en) | 2004-07-16 | 2010-11-02 | Alertis Medical As | Electrochemical sensor for in-vivo or ex-vivio measurements of the carbon dioxide partial pressure of living tissue |
| JP2014006128A (en) * | 2012-06-22 | 2014-01-16 | Omron Corp | Gas sensor and gas sensing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6236172B2 (en) | 1987-08-05 |
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