Tintometer Aqualytic AL100 Mode D'emploi page 35

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Methods
GB
Notes:
1. Vial cleaning:
As many household cleaners (e.g. dishwasher detergent) contain reducing substances,
the subsequent determination of Chlorine may show lower results. To avoid any meas-
urement errors, only use glassware free of Chlorine demand.
Preparation: Put all applicable glassware into Sodium hypochlorite solution (0.1 g/l) for
one hour, then rinse all glassware 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. Do not use the same sample vial for free and total chlorine without thoroughly rinsing
the vial between the two different tests.
4. Preparing the sample:
When preparing the sample, the lost of Chlorine, e.g. by pipetting or shaking, must be
avoided. The analysis must take place immediately after taking the sample.
5. 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 be adjusted between pH 6 and pH 7 before
the reagent is added (use 0.5 mol/l Sulfuric acid resp. 1 mol/l Sodium hydroxide).
6. Exceeding the measuring range:
Concentrations above 2 mg/l Chlorine can lead to results showing 0 mg/l. In this case,
the water sample must be diluted with water free of Chlorine and the measurement
repeated.
7. Oxidising agents such as Bromine, Ozone etc. interfere as they react in the same way as
Chlorine.
Reagent / Accessories
VARIO Clorine Free-DPD/ F10
(blue color marking)
VARIO Chlorine Total-DPD /F10
(blue color marking)
MD100_1 02/2018
Form of reagent/Quantity
Powder Pack / 100
free
Powder Pack / 100
total
Order-No.
4530180
4530190
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