摘要
循环冷却水中余氯的测定有邻联甲苯胺法和DPD法,本文探讨了DPD法取代邻联甲苯法测定化肥企业中含有亚硝酸盐和磷系水稳剂的循环冷却水中余氯的可行性,测试并确定了合适的分析条件。
There are two methods can meet the requirements of the content test of residual chlorine in cooling water; the o - tolidine and N, N - diethyl -1,4- phenylenediamine ( DPD) , this article presents the method using DPD that can be used in the content test of free chlorine and combined available chlorine respectively and accurately in cooling water containing nitrite and water treatment chemicals consisted of phosphorous compounds in fertilizer plant by defining the test conditions, the method using DPD is suggested to instead of the one using o - tolidine that only can be used in total residual chlorine content test.
