MACHEREY-NAGEL 936220 Visocolor Powder Pillows Free Chlorine Instructions
- June 3, 2024
- MACHEREY-NAGEL
Table of Contents
Test 7-20
Instructions
936220 Visocolor Powder Pillows Free Chlorine
Free Chlorine
DPD-Reagent for the photometric determination of free chlorine in drinking
water, swimming pools and water reservoirs
Measuring range:
0.03–6.00 mg/L Cl2
Method:
At a pH value of 6.2 to 6.5 in a phosphate buffered system, free chlorine
reacts with N,N-diethyl-1,4-phenylene diamine (DPD) and forms a red-violet
dye. In order to obtain accurate results the sample must be analyzed
immediately after collection and cannot be preserved for later analysis.
Bubbles in the sample cell can cause higher chlorine contents and must be
avoided. This may require an additional gentle shaking.
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:
Requisite accessories: 2 test tubes 16 mm OD (REF 91680) or 2 test tubes 24 mm
OD (REF 936101)
A. Rinse test tube several times with sample (pH value of sample must be
between pH 4 and 8)
Blank (optional):
B. Fill one test tube with 5 mL of sample
C. Clean test tube
D. Place test tube in photometer as blank value and adjust for zero
Sample:
E. Fill another test tube with 5 mL of sample
F. Add content of 1 Powder Pillow free Chlorine
G. Close test tube and shake well
H. Clean test tube
I. Wait for 1 min
J. Measure
*Alternative procedure: Use 10 mL of sample.
Measurement:
See manual for all MACHEREY-NAGEL photometers.
After use, rinse out test tubes thoroughly and seal them.
Suitable for the analysis of sea water.
Interferences:
The temperature of the water sample should be between 10 °C and 50 °C.
Br2 and I2 interfere at all levels.
Bromamines and Chloramines interfere at all levels.
Manganese compounds in high oxidation states interfere at all levels.
Traces of remaining iodide from prior measurements might lead to higher
amounts of free chlorine.
ClO2 and other oxidizing agents interfere at all levels.
Disposal of samples:
Information regarding disposal can be found in the safety data sheet. You can
download the SDS from www.mn-net.com/SDS.
Blank (optional):
Sample:
MACHEREY-NAGEL GmbH & Co. KG · Neumann-Neander-Str. 6–8 · 52355 Düren ·
Germany
Tel.: +49 24 21 969-0 · info@mn-net.com · www.mn-
net.com
Rev 2021-01 / 936220
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>