Camlab Lovibond MD 610, Instruction Manual

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MD 610_2d 11/2019
Notes:
1. Vial cleaning:
As many household cleaners (e.g. dishwasher detergent) contain reducing substances,
the subsequent determination of Ozone may show lower results. To avoid any
measurement errors, only use glassware free of Chlorine demand.
Preparation: Put all applicable glasswareinto Sodium hypochlorite solution (0.1 g/l) for
one hour, then rinse all glasswarethoroughly with deionised water.
2. Preparing the sample:
When preparing the sample, the lost of Ozone, e.g. by pipetting or shaking, must be
avoided. The analysismust take place immediately after taking the sample.
3. The DPDcolour development is carried out at a pH value of 6.2 to 6.5. The reagent
tablet therefore contains a buffer for the pH adjustment.
Strong alkaline or acidic water samplesmust 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 6 mg/l Ozone can lead to results showing 0 mg/l. In this case,the
water sample must be diluted with water free of Ozone. 10 ml of the diluted sample
should be mixed with the reagent and the measurement repeated.
5. If ??? is displayed at the diffentiated test result seepage 362.
6. Oxidising agents such as Bromine, Chlorine etc. interfere as they react in the same way
as Ozone.