Lovibond Tintometer MD 100 Manual De Instrucciones página 35

Chlorine HR PP / M111
Chlorine HR PP
0.1 - 8 mg/l Cl
DPD
Material
EN
Required material (partly optional):
Reagents
Chlorine Free DPD F10
Chlorine Free DPD F10
Chlorine Total DPD F10
Chlorine Total DPD F10
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).
36
a)
2
Packaging Unit
Powder / 100 pc.
Powder /
1000 pc.
Powder / 100 pc.
Powder /
1000 pc.
EN Method Reference Book 1.0
M111
CL8
Part Number
530100
530103
530120
530123