Water quality. Determination of free chlorine and total chlorine - Colorimetric method using N,N-dialkyl-1,4-phenylenediamine, for routine control purposes1 Scope This document specifies a method for the determination of free chlorine and total chlorine in water, readily applicable to lab and field testing. It is based on measurement of the absorption, the red DPD colour complex in a photometer or the colour intensity by visual comparison of the colour with a scale of standards that is regularly calibrated. This method is appropriate for drinking water and other waters, where additional halogens like

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When it is required that the concentration of a specific fraction is to be determined then recourse to the relevant standard method from the ISO 8573 series is recommended

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