MACHEREY-NAGEL 931015 Visocolor Eco Chlorine 2 Colorimetric Test Kit Instruction Manual

: June 4, 2024
: MACHEREY-NAGEL

Table of Contents

931015 Visocolor Eco Chlorine 2 Colorimetric Test Kit
photometric determination
References
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931015 Visocolor Eco Chlorine 2 Colorimetric Test Kit

Chlorine 2
Test kit for performing colorimetric tests on free and total chlorine in drinking water, swimming pools, and water reservoirs

Method:
At a pH value of 6.2 to 6.5 in phosphate buffered system, free chlorine reacts with N, N-diethyl-1,4-phenylene diamine (DPD) and forms a red-violet dye. In the presence of iodide ions, the content of total chlorine (free and combined chlorine together) can be determined.

Measurement range:
0.1–2.0 mg/L Cl2
Contents of test kit (*refill pack): sufficient for 150 tests

18 mL Cl2-1
25 mL Cl2-2
30 mL Cl2-3 (only REF 931015 / 931215)
2 screw-plug measuring glasses
1 slide comparator
1 color chart
1 plastic syringe 5 mL
1 instruction for use

Hazard warning:
Information regarding safety can be found on the box label and in the safety data sheet. You can download the SDS from www.mn-net.com/SDS.

Procedure:
I.) colorimetric determination with a color chart also refer to the pictogram on the back of the color chart
a) Free chlorine

Pour a 5 mL water sample into one of the measuring glasses using the plastic syringe and place it on position A in the comparator.
Only add the reagent to measuring glass B.
Fill the second measuring glass with 3 drops of Cl2-1.
Add 3 drops of Cl2-2.
Add a 5 mL water sample using the plastic syringe, seal the glass, and mix.
Open the glass and place it in position B in the comparator.
Slide the comparator until the colors match in the inspection hole on top.
Immediately check the measurement reading in the recess on the comparator reed. Mid-values can be estimated.
b) Total chlorine (only REF 931015 / 931215)
Add 3 drops of Cl2-3. Seal the glass and mix.
Open the glass after 2 min, place it on position B in the comparator and read off the chlorine value as described above.
After use, rinse out both measuring glasses thoroughly and seal them.
c) Combined chlorine
The content of combined chlorine can be calculated as the difference between total and free chlorine.

photometric determination

The reagents are also suitable for photometric evaluation. Please refer to the separate instructions for photometric performance.
This technique can also be used for analyzing sea water after dilution (1+1).
Disposing of the samples:
Information regarding disposal can be found in the safety data sheet. You can download the SDS from www.mn-net.com/SDS.

Interferences:
The determination of free chlorine measures bromine, bromine, chloramine, iodine, and, in part, chlorine dioxide as well. Higher manganese compounds simulate free chlorine. Chlorine concentrations above 10 mg/L can bleach the red reaction color (low results). Rinse glass tubes several times thoroughly. Residues of Cl2-3 can cause higher values for free chlorine.

Note:
Determination of bromine besides chlorine: If chlorine is present in the sample, it can be destroyed by adding a spatula of glycine (approx. 20 mg) to a 25 mL sample. The sample for the bromine determination is taken from this solution. Result in mg/L Cl2 x 2.25 = mg/L Br2.

Conversion table:

mg/L Cl2	mg/L ClO2	mg/L OCl	mg/L NaOCl	mg/L Br2	mg/L I2
0.1	0.2	0.1	0.2	0.2	0.4
0.2	0.4	0.3	0.4	0.5	0.7
0.3	0.6	0.4	0.6	0.7	1.1
0.4	0.8	0.6	0.8	0.9	1.4
0.6	1.1	0.9	1.3	1.4	2.1
0.9	1.7	1.3	1.9	2	3.2
1.2	2.3	1.7	2.5	2.7	4.3
2	3.8	2.9	4.2	4.5	7.2

For swimming pools (in Germany) please note:
If the content of free chlorine is below 0.3 mg/L, add some chlorinating reagent. If the content is above 0.6 mg/L, add fresh water. The ideal pH value is 7.4.
Storage:
Store the test kit in a cool (< 25 °C) and dry place.

MACHEREY-NAGEL GmbH & Co. KG · Valencienner Str. 11 · 52355 Düren · Germany
Tel.: +49 24 21 969-0 · info@mn-net.com · www .mn-net.com