1.11112.

0001
Kompaktlabor
für die Bauindustrie
zur Untersuchung von betonangreifendem Wasser

Compact Laboratory
for the construction industry
for the investigation of concrete-aggressive water
1.11112.0001 Aquamerck® Compact Laboratory
for the construction industry
for the investigation of concrete-aggressive water

Reagent kit with waterproof colour cards, reagents, test strips and complete set of
accessories for the determination of:

Odour (H2S): 100 tests

Lime-dissolving carbonic acid (lime-dissolving capacity): 50 tests
pH: 200 tests
Total hardness: 50 tests at 12.5 ˚e
Carbonate hardness: 50 tests at 12.5 ˚e
–
Chloride: 70 tests at 200 mg/l Cl
Magnesium: 50 tests
Ammonium: 100 tests
Sulfate: 100 tests

Contents
Seite
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2. Odour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3. Lime-dissolving carbonic acid (lime-dissolving capacity) . . . . . . . . . . . . . 14
4. pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5. Total hardness (sum of alkaline earth ions) . . . . . . . . . . . . . . . . . . . . . . . 17
6. Carbonate hardness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7. Chloride . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8. Magnesium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9. Ammonium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10. Sulfate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
11. Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12. Refill packs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
13. Representatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12
1. General
Concrete, while being a reliable and generally durable building material, is sus-
ceptible to attack by certain types of water, which impair its otherwise excellent
properties.
Such water is said to be aggressive and may be found as ground, bog, spring, river
or waste water. Aggressive water can generally be recognized by its dark colora-
tion, by a putrid odour, by precipitation of salts, or by the presence of rising gas
bubbles. It is important to realize, however, that concrete is also attacked by
water which at first sight may appear to be pure.
DIN 4030 “Beurteilung betonangreifender Wässer, Böden und Gase” (= “Evaluation
of water, soils and gases aggressive to concrete”) quotes lime-dissolving capacity
(lime-dissolving carbonic acid), pH, chloride, magnesium, ammonium, and sul-
fate as factors which influence the severity of attack. All of these parameters can
be measured using this Compact Laboratory for the construction industry.
The values set by DIN 4030 for the various degrees of attack are listed below:

Aggressive components Degree of attack

slight severe very severe
Lime-dissolving
carbonic acid (CO2 in mg/l 015 – 0040 0040 – 0100 above 0100
(marble test acc. to Heyer)
Acids pH 6.5 – 5.50 5.5 – 4.5 below 4,5
Magnesium (Mg ) 2+ in mg/l 300 – 1000 1000 – 3000 above 3000
+
Ammonium (NH ) 4 in mg/l 015 – 0030 0030 – 0060 above 0060
Sulfate (SO )2– in mg/l 200 – 0600 0600 – 3000 above 3000
4

–
Chloride (Cl ) does not attack concrete at concentrations under 500 mg/l.
Assign the results obtained to the various columns in the table above. The initial
assessment of severity is governed by the highest column under which any single
value falls. However, if two or more results are close to the upper borderline be-
tween one column and the next highest (or the lower borderline in the case of
pH), the degree of attack is taken as being one step more severe. The figures listed
in the table are for “normal conditions”. Aggressivity may be more severe, for
instance, at higher water temperatures, or less severe, as when only small quanti-
ties of substance are encountered.
Natural waters of very low total hardness (less than 3 °d or 0.5 mmol/l) and
waters containing hydrogen sulfide, sulfite or organic constituents may have a
slight corrosive capacity.
Sulfate resistant cement is required in cases where the sulfate content is greater
than 400 mg/l (use HS cement as defined in DIN 1164). DIN 1045 lists further

13
measures to be considered when mixing concrete which is expected to withstand
a high degree of chemical attack.
The Aquamerck ® Compact Laboratory for the construction industry for the inves-
tigation of concrete-aggressive water is intended to facilitate rapid, semi-quantita-
tive, on-site testing in accordance with DIN 4030. If all values measured are well
below the minimum level for slight attack (or above it in the case of pH and total
hardness), the water may be considered safe. If, however, the results obtained give
reason to fear corrosion, final judgment should be reserved until formal quantita-
tive analysis has been conducted in a chemical laboratory. Also, it is important to
consult a specialist if hydrogen sulfide is present (smell of bad eggs, sometimes
not noted until the water is acidified with phosphoric acid), or if there is reason
to suspect the presence of appreciable amounts of organic constituents.
The Compact Laboratory contains all the reagents and accessories needed to per-
form the tests, together with printed instructions, in a sturdy plastic case. The
tests are simple to perform.

2. Odour
Method of determination:
Hydrogen sulfide may be given off when a water sample is acidified with phos-
phoric acid. It has a characteristic odour of bad eggs.

Instructions for use:

For this test, please use the following reagent:
Phosphoric acid: “1.11112., Phosphorsäure”
1. Rinse the test vessel with the water to be tested and fill to the 5-ml
mark.
2. Add 5 drops of phosphoric acid and swirl cautiously.
3. Check the odour of the sample before and after adding acid.

Note:
A qualitative test can be performed using lead(II) acetate paper, Cat. No.
1.09511.0001, or a semi-quantitative test using the Microquant® Sulfide Test
(former designation: Microquant® Hydrogen Sulfide Test), Cat. No. 1.14777.0001.

3. Lime-dissolving carbonic acid

(lime-dissolving capacity)
Method of determination:
Calcium carbonate added to the water dissolves to form hydrogen carbonate at a
rate proportional to the amount of lime-dissolving carbonic acid (aggressive

14
carbon dioxide) present in the water. This causes the carbonate hardness to rise.
Undissolved calcium carbonate is then removed, after which the lime-dissolving
capacity and, respectively, the content of lime-dissolving carbonic acid can be
calculated from the rise in carbonate hardness.

Instructions for use:

For this test, please use the following reagents:
„1.11130., Kohlensäure (kalklösend)-Test“:
Calcium carbonate: „Reagenz 1, Calciumcarbonat“
Indicator solution: „Reagenz 2, Indikatorlösung“
Titration solution: „Reagenz 3, Titrierlösung“
1. Rinse the glass bottle with the water to be tested and fill to the brim.
2. Add 1 level spoonful of calcium carbonate and close the bottle with the
tapered glass stopper, ensuring that no air bubbles are entrained.
3. Shake the glass bottle until the calcium carbonate is evenly distributed
and set aside for 5 min. (Keep the temperature constant by suspending
or standing the bottle in the water to be tested and occasionally shake
the bottle.)
4. Filter off any undissolved calcium carbonate and discard the first few
millilitres of filtrate.
5. Rinse the test vessel with a few millilitres of the filtrate, then fill to the
5-ml mark.

15
 6. Add 3 drops of indicator solution and shake thoroughly.
7. With shaking add titration solution dropwise (hold the dropping bottle
vertically). Count the number of drops needed (A) to turn the solution
from blue to red.
8. Multiply the original carbonate hardness (B) by 1.8 and subtract the
result from the number of drops counted (A). Multiply this difference
by 5.6 to give the lime-dissolving capacity (C) in mg/l CaO:
C = 5.6 (A – 1.8 B)
Regard any negative value obtained as zero.
For the description of the long-term behaviour of concrete in aggressive
waters, the concentration of lime-dissolving carbonic acid in mg/l CO 2
is often cited instead of the lime-dissolving capacity (C) in mg/l CaO.
For this purpose, the value obtained for C must be multiplied by the
factor 1.5696:
Concentration of lime-dissolving carbonic acid in mg/ l CO2 = C x 1.5696

Notes:
If the sample has already been stabilized with calcium carbonate, start the deter-
mination at point 4 above.
Determination of carbonate hardness (B) see Chapter 6.

4. pH
Method of determination:
An indicator added to the water sample changes colour according to the pH of
the sample. By matching the colour aganinst a scale the pH can be rapidly and
accurately measured.

Instructions for use:

For the pH Test, please use the following reagent as indicator solution:
“1.08038. · 1.08043. · 1.11137., Reagenz, Indikatorlösung”
1. Rinse the test vessel with the water to be tested and fill to the 5-ml
mark.
2. Add 3 drops of indicator solution and shake thoroughly.
3. Place the test vessel on the white strip of the pH colour scale and slide
along until the colour of the solution matches a colour on the colour
scale or is intermediate between two colours. In doing so, view the
solution from above.
4. Record the pH.

16
5. Total hardness (sum of alkaline earth ions)
Method of determination:
An indicator is added to the water sample and Titriplex® III (EDTA) solution is
added dropwise to produce a colour change. The Titriplex® III solution has been
adjusted so that 1 drop corresponds to exactly 1 °d or, in other words, the num-
ber of drops used is directly equivalent to the total hardness in German degrees of
hardness.

Instructions for use:

For the Total Hardness Test (“Gesamthärte-Test”), please use the follow-
ing reagents:
Indicator solution: “1.11104., Reagenz 1, Indikatorlösung”
Titration solution: “1.11104., Reagenz 2, Titrierlösung”
1. Rinse the test vessel with the water to be tested and fill to the 5-ml
mark.
2. Add 3 drops of indicator solution and swirl cautiously. The sample
turns red in the presence of hardening constituents.
3. While swirling, add 1 drop of titration solution every 5 sec (hold the
dropping bottle vertically) until the colour of the water sample changes
to green. Count the number of drops.
1 drop =ˆ 1 °d = 1.25 °e = 10 mg/l CaO = 17.8 mg/l CaCO3
= 0.18 mmol/l alkaline earth ions

6. Carbonate hardness
Method of determination:
An indicator is added to the water sample and a hydrochloric acid solution is
added dropwise to produce a colour change. The hydrochloric acid solution has
been adjusted so that 1 drop corresponds to exactly 1 °d or, in other words, the
number of drops used is directly equivalent to the carbonate hardness in German
degrees of hardness.

Instructions for use:

For the Carbonate Hardness Test (“Carbonathärte-Test”), please use the
following reagents:
Indicator solution: “1.11103., Reagenz 1, Indikatorlösung”
Titration solution: “1.11103., Reagenz 2, Titrierlösung”
1. Rinse the test vessel with the water to be tested and fill to the 5-ml
mark.

17
 2. Add 3 drops of indicator solution and swirl cautiously. The sample
turns blue in the presence of hardening constituents.
3. Add titration solution dropwise from the dropping bottle to turn the
sample from blue to red. Hold the dropping bottle vertically and swirl
the test vessel cautiously after each drop added. Count the number of
drops.
1 drop =ˆ 1 °d = 1.25 °e

7. Chloride
Method of determination:
The chloride ion concentration is determined by mercurimetric titration with
mercury(II) nitrate.
Mercury(II) ions react with chloride ions to form practically undissociated
mercury(II) chloride. Excess mercury(II) ions form a blue-violet complex with
diphenylcarbazone indicator in a solution acidified with nitric acid.

Instructions for use:

For the Chloride Test (“Chlorid-Test”), please use the following reagents:
Indicator solution: “1.11132., Reagenz 1, Indikatorlösung”
Reagent 2: “1.11106. · 1.11132., Reagenz 2”
Titration solution: “1.11132., Reagenz 3, Titrierlösung”
1. Rinse the test vessel with the water to be tested and fill to the 5-ml
mark.
2. Add 2 drops of indicator solution and shake thoroughly. This generally
causes the solution to turn blue.
3. With further shaking add reagent 2 dropwise to turn the solution
yellow.
4. Add titration solution dropwise from the dropping bottle to turn the
sample from yellow to violet. Hold the dropping bottle vertically and
swirl the test vessel cautiously after each drop added. Count the num-
ber of drops.
1 drop =ˆ 25 mg/l Cl–

8. Magnesium
Method of determination:
Magnesium ions form a red dye with the Mann and Yoe reagent. Since the
reagent is very sensitive, the sample must be diluted twice with buffer solution.

18
Instructions for use:
For the Magnesium Test, please use the following reagents:
Buffer solution: “1.11131., Mg-1, Pufferlösung”
Reagent solution: “1.11131., Mg-2, Reagenzlösung”
1. Use the dropping pipette to transfer 1 drop of water sample to the test
vessel.
2. Add 9 drops of buffer solution and mix thoroughly.
3. Use the second dropping pipette to transfer 2 drops of this solution to a
second test vessel.
4. Fill the latter vessel to the 5-ml mark with buffer solution.
5. Add 10 drops of reagent solution and shake.
6. Place the test vessel on the white strip of the magnesium colour scale
and slide along until the colour of the measurement solution matches a
colour on the colour scale or is intermediate between two colours.
(In doing so, view the solution from above.)
7. Record the magnesium content in mg/l.

9. Ammonium
Method of determination:
Nessler’s reagent contained in the reaction zone of the test strip turns yellow or
brown when immersed in a solution containing ammonia or ammonium ions.

Instructions for use:

For the Ammonium Test, please use the following reagent in addition to
the test strips:
“1.10024., Reagenz”
1. Rinse the test vessel with the water to be tested and fill to the 5-ml
mark.
2. Add 10 drops of reagent and shake thoroughly.
3. Immerse the reaction zone of a test strip in the solution for 1 sec.
4. Remove the test strip and shake off excess liquid.
5. After 10 sec compare the reaction zone with the colour scale.

10. Sulfate
Method of determination:
The four reaction zones on the strip contain different amounts of the red thorin-
barium complex. Depending on the amount of sulfate ions present, the colour
changes to that of the yellow thorin.

19
Instructions for use:
1. Immerse a test strip in the sample solution (not running water) for 1 sec,
so that all reaction zones are completely wetted.
2. Withdraw the test strip, shake off excess liquid, wait 2 min, and then
compare the reaction zones with the colour scale.

Notes:
The pH of the sample solution should be between 4 and 8. Acidic solutions (pH
below 4) must be buffered with sodium acetate (Cat. No. 1.06268.), and alkaline
solutions (pH greater than 8) with ascorbic acid (Cat. No. 1.00127.).
If the solution under test has a sulfate content just at the upper borderline of a
colour-change range, the reaction zone in question remains slightly red at the
edges. At higher sulfate concentrations the edges turn yellow, too.

11. Safety precautions

Keep the test kit under lock and key and out of reach of children. Keep the test kit
away from food. Do not eat or smoke when performing the tests. Avoid contact
with skin and eyes.

20
12. Refill packs
1.11130.0001 Aquamerck® Carbonic Acid (lime-dissolving) Test
Reagent kit with dropping bottles and complete accessories
for 50 tests

1.11137.0001 Aquamerck® pH Test

Reagent kit with colour card
for 200 tests

1.11104.0001 Aquamerck® Total Hardness Test (sum of alkaline earth ions)

Reagent kit with dropping bottle
for 50 tests at 12.5 °e

1.11103.0001 Aquamerck® Carbonate Hardness Test

Reagent kit with dropping bottle
for 50 tests at 12.5 °e

1.11132.0001 Aquamerck® Chloride Test

Reagent kit with dropping bottle
for 70 tests at 200 mg/l Cl–

1.11131.0001 Aquamerck® Magnesium Test

Reagent kit with colour card
for 50 tests

1.10024.0001 Merckoquant® Ammonium Test

for 100 tests

1.10019.0001 Merckoquant® Sulfate Test

Pack containing 100 strips

21
13. Bezugsquellen / Representatives
ALGERIA CANADA CZECH REPUBLIC Merck KGaA
Merck S.A. BDH Inc. Merck spol. s r.o. Frankfurter Str. 250
5/9, rue Anquetil 350 Evans Avenue Belohorska 39/260 D-64293 Darmstadt
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CHILE Dr. Theodor Schuchardt & Co.
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22
ITALY NEW ZEALAND RUSSIA SYRIA
Bracco S.P.A. BDH Chemicals Merck KGaA Droguerie Syrie
Divisione Chimica New Zealand Ltd. Krasnopresnenskaja nab. 12 P. O. Box 54 41
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Phone +81 (0) 3 54 344 700 Postboks 45, Kalbakken P. O. Box 50 12 Phone +886 (0) 22 5219 331 /
Telefax +81 (0) 3 54 344 705 N-901 OSLO RIYADH 11422 5652 180
E-Mail iq003911@nisiq.net Phone +47 (0) 22 900 000 Phone +966 (0) 1 4041 717 Telefax +886 (0) 22 5216 905
Telefax +47 (0) 22 900 040 Telefax +966 (0) 1 4059 052 E-Mail lilys@merck.com.tw
Kanto Chemical Co. Inc. E-Mail kebo@kebolab.no
Marusan Bldg. 2F SINGAPORE THAILAND
11-5, Nihombashi Honcho Merck Industrikjemikalier Merck (Singapore) Pte. Ltd. Merck Ltd.
3-chome Chuo-Ku Kalbakken No. 22 Tuas Avenue 10 2170, Monterey Tower, 9th Flr.
TOKYO 103 Postboks 45 SINGAPORE 639145 New Petchburi Road
Phone +81 (0) 3 36 637 631 N-901 OSLO Phone +65 (0) 8631 800 Bangkapi, Huay Kwang
Telefax +81 (0) 3 36 678 277 Phone +47 (0) 22 900 057 Telefax +65 (0) 8636 800 BANGKOK 10320
Telefax +47 (0) 22 900 058 E-Mail merck.sg@mesi.com.sg Phone +66 (0) 2 3080 218-24
JORDAN Telefax +66 (0) 2 3080 216-7
Henry Marroum & Sons PAKISTAN SLOVAKIA E-Mail service@merck.co.th
Lab. Serve Merck Marker (Pvt.) Ltd. Merck spol. s r.o.
P. O. Box 589 D/7, Shaheed-e-Millat Road Hagarova 9/A TUNISIA
AMMAN 11118 KARACHI P.O. Box 3 Merck S.A.
Phone +962 (0) 6 4613 523 Phone +92 (0) 21 4559 210 - 17 SK-830 04 BRATISLAVA 5/9, rue Anquetil
Telefax +962 (0) 6 4638 088 Telefax +92 (0) 21 4559 221 / Phone +42 (0) 1 7 49 267 111 F-94736 NOGENT-SUR-MARNE
E-Mail info@labserve.com.jo 4535 294 Telefax +42 (0) 1 7 49 267 777 CEDEX
E-Mail merck@paknet3.ptc.pk E-Mail merck@merck.sk Phone +33 (0) 1 43 945 400
KUWAIT Telefax +33 (0) 1 48 761 815
Bader Sultan & Bros. Co. Ltd. PARAGUAY SLOVENIA
6th Ring Road S. Farwania Vicente Scavone y Cia. C.I.S.A. Merck d.o.o. TURKEY
P.O.Box 867 Presidente Franco 570 Slowenia Alfred Paluka & Co.
13009 SAFAT ASUNCIÓN Dunajska Cesta 156 Postfach 532
Phone +965 (0) 4 332 555 Phone +595 (0) 21 490 251 / SLO-1113 LJUBLJANA 80004 ISTANBUL-KARAKÖY
Telefax +965 (0) 4 334 217 497 253 Phone +386 (0) 61 1881 380 Phone +90 (0) 212 2513 618 /
E-Mail react@ncc.moc.kw Telefax +595 (0) 21 494 704 / Telefax +386 (0) 61 1881 383 2516 738
440 642 Telefax +90 (0) 212 2524 458
LUXEMBOURG SOUTH AFRICA
Merck-Belgolabo N.V.- S.A. PERU Merck (Pty.) Ltd. USA
Brusselsesteenweg 288 Merck Peruana S.A. P. O. Box 1998 EM Industries Inc.
B-3090 OVERIJSE Av. Los Frutales No. 220 HALFWAY HOUSE 1685 5, Skyline Drive
Phone +32 (0) 2 6860 711 Ate/Vitarte Phone +27 (0) 11 3151 100 HAWTHORNE, N.Y. 10532
Telefax +32 (0) 2 6879 120 Casilla 4331 Telefax +27 (0) 11 3151 353 Phone +1 (0) 914 5924 660
E-Mail bebfkvdp@ibmmail.com LIMA 3 E-Mail merck@global.co.za Telefax +1 (0) 914 5929 469
Phone +51 (0) 1 4375 440 E-Mail feedback@emindustries.com
MACEDONIA Telefax +51 (0) 1 4372 955 SOUTH KOREA
Varus E-Mail postmast@mpsa.com.pe Merck Korea Ltd. EM Science
Merck Representation Macedonia Kang-Nam 480 S. Democrat Road
Mito Hadzivasilev-Jasmin Bb PHILIPPINES P. O. Box 312 GIBBSTOWN, N.J. 08027
91000 SKOPJE Merck Inc. SEOUL Phone +1 (0) 609 4236 300
Phone +389 (0) 91 115 122 Vernida IV Building 7th Floor Phone +82 (0) 2 5555 964 Telefax +1 (0) 609 4234 389
Telefax +389 (0) 91 137 013 128 Alfaro Street Telefax +82 (0) 2 5571 440 E-Mail ismrke@emscience.
Salcedo Village E-Mail merckkor@shinbiro.com emindustries.com
MALAYSIA 1227 MAKATI-METRO MANILA
Merck (Malaysia) SDN. BHD Phone +63 (0) 2 8126 241 / SPAIN VENEZUELA
74, Jalan Universiti 8186 969 Merck Farma y Química, S.A. Merck S.A.
46200 Petaling Jaya Telefax +63 (0) 2 8103 024 Division Productos Quím. y React. Apartado 20 20
SELANGOR DARUL EHSAN E-Mail edymerck@webquest.com Apartado 47 CARACAS 1010A
Phone +60 (0) 3 7587 022 - 08100 MOLLET DEL VALLES Phone +58 (0) 2 2566 533 /
7587 029 POLAND (BARCELONA) 2052 001
Telefax +60 (0) 3 7570 459 Merck Sp. z o.o. Phone +34 (0) 93 5655 500 Telefax +58 (0) 2 2568 358
E-Mail lsmerck@pc.jaring.my Ul. Banderii 4 Telefax +34 (0) 93 5440 000 E-Mail mven@telcel.net.ve
01-164 WARSZAWA E-Mail
MAROCCO Phone +48 (0) 22 36 7117 / 106333.2542@compuserve.com VIETNAM
Merck S.A. 36 7209 Merck Representative Office
5/9, rue Anquetil Telefax +48 (0) 22 368 203 SWEDEN 181 Vo Thi Sau - District 3
F-94736 NOGENT-SUR-MARNE E-Mail lpro.mm@merck.com.pl E. Merck AB HO CHI MINH CITY
CEDEX Fagerstagatan 18 A Phone +848 (0) 9320 187 /
Phone +33 (0) 1 43 945 400 PORTUGAL S-163 94 SPÅNGA 9320 189
Telefax +33 (0) 1 48 761 815 Merck Farma e Química, S.A. Phone +46 (0) 8 6213 800 Telefax +848 (0) 9320 186
Rua Alfredo da Silva 3c Telefax +46 (0) 8 6213 890 E-Mail merckvn@hcm.vnn.vn
MEXICO 1304 LISBOA-CODEX
Merck-México S.A. Phone +351 (0) 1 3613 500 KEBO Lab AB YUGOSLAVIA
Apartado 86 19 Telefax +351 (0) 1 3613 665 Fagerstagatan 18 A NOVOS
06000 MEXICO, D.F. E-Mail merck@merck.pt S-16394 SPÅNGA Merck Representation Yugoslavia
Phone +52 (0) 5 7269 015 Phone +46 (0) 8 6213 400 Bulevar Lenjina 165a
Telefax +52 (0) 5 3580 408 ROMANIA Telefax +46 (0) 8 7604 520 YU-11070 BEOGRAD
E-Mail compuserve: 74174,1373 Merck KGaA E-Mail kebo@kebolab.se Phone +381 (0) 11 3115 673
Representation Office Telefax +381 (0) 11 3116 679
NETHERLANDS Blvd. Unirii 15 SWITZERLAND
E. Merck Nederland B.V. Bloc 3, Sc. 1 Merck (Schweiz) AG
Basisweg 34 Et. 2, Ap. 7 / Sector 5 Rüchligstrasse 20
Postbus 8198 1 BUKAREST CH-8953 DIETIKON
NL-1005 AD AMSTERDAM Phone +40 (0) 1 3366 889 Phone +41 (0) 1 7451 111
Phone +31 (0) 20 4808 400 Telefax +40 (0) 1 3365 667 Telefax +41 (0) 1 7451 100
Telefax +31 (0) 20 4808 480 E-Mail merck.labor@merck.ch
E-Mail office@merck.nl Internet www.merck.ch

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Merck KGaA
64271 Darmstadt, Germany
Telefon (0 61 51) 7 20
Telefax (0 61 51) 72 20 00 9.71111.1210/02-61498361