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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.
DPD-meetod . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/DPD-meetod/1/est (01.07.2026)
