Cu－T（4－MOP）PS_4光度法间接测定水中可溶性硫化物

Study on the indirect Determination of the Soluble Sulfide in Water by Spectrophotometry

利用Ｃｕ２＋与水中的Ｓ２－形成难溶的ＣＵＳ，剩余Ｃｕ２＋的含量用Ｔ（４－ＭＯＰ）ＰＳ４光度法测定，间接求得Ｓ２－的含量．研究了沉淀和显色的最佳条件．在ＰＨ８．５左右，形成难溶的ＣｕＳ，过量的铜在ｐＨ４．０用Ｔ（４－ＭＯＰ）ＰＳ４显色，然后用稀ＨＣｌ酸化至ＰＨ２．３左右测定，以提高方法的选择性，并探讨了共存离子的干扰情况．Ｓ２－的含量在０－０．２０μｇ／ｍｌ范围内符合比尔定律，相关系数ｒ＝０．９９９５，回收率为９４．０２％－１００．８％．建立的方法用于废水中可溶性硫化物的测定，结果与标准方法一致．

n this paper,a new method for indirect determination of trace sulfide ion was developed.The optimum conditions of precipitate reaction of copper with sulfide and color reaction of copper with T(4-MOP)PS4 were discussed.At about pH 8. 5, CuS was formed,and at PH4.0 the surplus copper in the solution reacted with 1(4-MOP )PS4 to form Cu-T (4-MOP)PS4.Acidifing about PH2.3 by dilute hydrochloric acid,the solution was determined by spectrophotometry.The content of S2-in the sample was calculated.The effect of interference ions was studied.The Beer'slaw is obeyed in the range of 0 - 0. 20 μg/ml.The correlation coefficient is 0.9995 and the recoveries of sulfide are in range of 94. 02%100.8%.The proposed method was used to determine the soluble sulfide in waste water and the results are agreed with the standard method.