DIN EN ISO 7393-2:2019-03
水质游离氯和总氯的测定第2部分:使用N,N-二烷基-1,4-苯二胺的比色法 用于常规控制目的
Water quality - Determination of free chlorine and total chlorine - Part 2: Colorimetric method using N,N-dialkyl-1,4-phenylenediamine, for routine control purposes (ISO 7393-2:2017); German version EN ISO 7393-2:2018