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an analytical method for determining chlorine residual utilizing the reagent DPD (n-diethyl-a-phenylenediamine). This is the most commonly and officially recognized test for free chlorine residual.
dietüül-p-fenüleendiamiini meetod . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/diet%C3%BC%C3%BCl-p-fen%C3%BCleendiamiini%20meetod/1/est (04.08.2026)
