水中的余氯如何测量？ - 知乎
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02 DPD比色法N,N-diethyl-p-phenylenediamine N,N-二乙基对苯二胺 (DPD)： DPD试剂会与水中的余氯发生反应,生成一种粉红色的化合物二苯胺盐酸盐，它会使水溶液呈现粉红色。 颜色的深浅与余氯的浓度成正比，余氯浓度越高，颜色越深。
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