DIN EN ISO 7393-2-2000 水质.游离氯和氯总含量测定.第2部分:为常规控制目的使用N,N-二乙基-1,4-苯二胺的比色法
Water quality - Determination of free chlorine and total chlorine - Part 2: Colorimetric method using N,N-diethyl-1,4-phenylenediamine, for routine control purposes (ISO 7393-2:1985); German version EN ISO 7393-2:2000
The document specifies a colorimetric method for the determination of free chlorine and total chlorine in water, especially in drinking water or water in swimming pools, in the concentration range 0,0004 mmol/l to 0,07 mmol/l.