论文部分内容阅读
研究并建立了测定水中痕量总余氯和游离余氯的Ｎ，Ｎ－二乙基－１，４－苯二胺（ＤＰＤ）反相流动注射分光光度法。将ＤＰＤ 溶液和ＨＰＯ４２－ －Ｈ２ＰＯ４－ 缓冲溶液（ｐＨ ６．７）的混合液注入试样载流中，再与ＫＩ溶液或硫代乙酰胺溶液流混合，在５１０ ｎｍ 处对反应形成的红色半醌式化合物进行分光光度测定。总余Ｃｌ２和游离余Ｃｌ２质量浓度的线性范围均为０．１～３．２ ｍ ｇ／Ｌ，检出限分别为０．０３５ 和０．０３８ ｍ ｇ／Ｌ，测定频率均为６０ 次／ｈ。本法已用于测定自来水中总余氯和游离余氯。
A reversed-phase flow injection spectrophotometric method was developed for the determination of trace residual free chlorine and total residual chlorine in water. A mixture of DPD solution and HPO42- -H2PO4-buffer solution (pH 6.7) is injected into the sample carrier stream and mixed with a KI solution or thioacetamide solution stream at 510 nm to form a red half Quinones for spectrophotometric determination. The linear range of the total residual Cl2 and free residual Cl2 concentration were 0.1 ~ 3.2 m g / L, the detection limits were 0.035 and 0.038 m g / L, the detection frequency was 60 times / h This method has been used to determine the total residual chlorine and free chlorine in tap water.