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The DPD reagent buffers the pH value of the sample water in the range of 6.2 to 6.5, which is
essential for colour development. If the sample water is very alkaline or acidic, this must be
adjusted to a pH within the range of 6 to 7 by addition of 0.5 mol/l sulphuric acid or 1 mol/l
caustic soda, respectively, before the DPD reagent is added.
If the sample water contains more than 60 mg/l iodine, a measured value of 0 mg/l can be
displayed. In that case, a dilution is recommended.
If the sample water contains further oxidizing agents, these will react like iodine and contribute
to the measurement result.
T97/204
T97/204
Summary of Contents for Primelab 2.0
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