VWR MCP 100 Manual De Instrucciones página 25

Tolerances:
0 – 1.9 mg/l: ± 0.1 mg/l
> 1.9 – 3.8 mg/l: ± 0.2 mg/l
Notes:
1. Vial cleaning:
As many household cleaners (e.g. dishwasher detergent) contain reducing substances,
the subsequent determination of Chlorine dioxide may show lower results. To avoid any
measurement 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. Preparing the sample:
When preparing the sample, the lost of Chlorine dioxide, e.g. by pipetting or shaking,
must be avoided. The analysis must take place immediately after taking the sample.
3. The DPD colour development is carried out at a pH value of 6.2 to 6.5. The reagents
therefore contains a buffer for the pH adjustment.
Strong alkaline or acidic water samples must be adjusted between pH 6 and pH 7 before
the tablet is added (use 0.5 mol/l Sulfuric acid resp. 1 mol/l Sodium hydroxide).
4. Exceeding the measuring range:
Concentrations above 3.8 mg/l Chlorine dioxide can lead to results showing 0 mg/l. In
this case, the water sample must be diluted with water free of Chlorine dioxide. 10 ml of
the diluted sample will be mixed with the reagent and the measurement repeated.
5. Oxidising agents such as Chlorine, Ozone etc. interfere as they react in the same way as
Chlorine dioxide.
30144.294
31627.290
85413.601
84208.600
VWR ver 1 23.01.2018
SULPHURIC ACID 0.5 MOL/L 1N AVS TITRINORM
SODIUM HYDROXIDE 1 MOL/L AVS R.PE/USP/NF
PH TEST STRIPS 4.5-10.0 DOSATEST
REFERENCE STANDARD KIT RSK CHLORINE MCP 100
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