Publicité
Chlorine HR 2 PP / M112
Chlorine HR 2 PP
0.1 - 10 mg/L Cl
DPD
Material
EN
Required material (partly optional):
Reagents
VARIO Chlorine Free DPD F25
VARIO Chlorine Total DPD F25
Sampling
1.
When preparing the sample, Chlorine outgassing, e.g. through the pipette or
shaking, must be avoided.
2.
The analysis must take place immediately after taking the sample.
Preparation
1.
Cleaning of vials:
As many household cleaners (e.g. dishwasher detergent) contain reducing
substances, this can lead to lower results with the determination of Chlorine.
To avoid measurement errors, the glassware used should be free of chlorine
consumption. To achieve this, all glassware should be placed in a sodium
hypochlorite solution (0.1 g/L) for one hour and then rinsed thoroughly with
deionised water.
2.
For individual testing of free and total Chlorine, the use of different sets of
glassware is recommended (EN ISO 7393-2, 5.3)
3.
The DPD colour development is carried out at a pH value of 6.2 to 6.5. The
reagents therefore contain a buffer for the pH adjustment. Strong alkaline or acidic
water samples must therefore be adjusted between pH 6 and pH 7 before the
analysis (use 0.5 mol/l Sulphuric acid or 1 mol/l Sodium hydroxide).
44
2
Packaging Unit
Powder / 100 pc.
Powder / 100 pc.
EN Method Reference Book 1.0
M112
Part Number
530110
530130
Publicité
