水中氯离子测定时干扰物的消除

用硝酸银滴定法测定水中氯离子时，存在S~2-、SO_3~2-、S_2_O_3~2-的干扰，原用H_2O_2消除干扰，但滴定到达终点后，颜色不太稳定，为此，我们采用过硫酸钾氧化法进行消除干扰的试验。实践证明,该方法对消除上述干扰物是可行的，对测定石油勘探开发废水中氯离子时消除干扰是适用的。

Elimination of Interfering Substance in Determining Chlorion in Water

While using silver nitrate titration to determine chlorion in water there exists interference of S~2-、SO_3~2-、S_2O_3~2-.Originally H_2O_2 was used to eliminate interference but it was not quite stable in colour on titrating to the end point.Consequently potassium persulfate oxidation was adopted to carry out the test for eliminating interference.The method through practice has been verified to be workable for eliminating the above-mentioned interference and also suitable for eliminating interference in determining chlorion in waste water relating to petroleum exploration and development.