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| Free chlorine reacts, also when iodide is absent, immediately with 1-amino-4-diethyl-aminobenzene hydrogen sulphate (DPD-sulphate) by forming a red coloured compound. After adding potassium iodide, bound chlorine also reacts with DPD-sulphate by forming a red coloured compound. By titrating this red coloured compound with iron(II)-ammonium sulphate solution until it is colourless, the free and bound chlorine content can be determined. |
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| Matrices qualified by the Dutch RvA: | Drinking water, Swimmingpool water |
| Reporting limit: | 0.05 mg/l, matrix dependent |
| Measurement uncertainty: | 20% |
| Sampling bottle: | Plastic
, white
, 250 ml
(fill up to the neck of the bottle)
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