水样中Cr(Ⅵ)的测定

Determination of Cr(Ⅵ) in the water samples

铬及其化合物在工业中应用广泛,对环境造成了较大的污染,是环境污染监测中的必测项目之一.在酸性溶液中,通过用Fe2+标准溶液滴定Cr(Ⅵ),使其还原成Cr3+,以二苯胺磺酸钠作指示剂,根据Fe2+标准溶液所消耗的体积,计算出水中Cr(Ⅵ)的含量(mg L).本实验操作简单,快速,通过对实际样品的测量,结果令人满意.

Chromium and its compounds are widely used in industry which resulted in greater environmental pollution as one of the items must be determined in environmental pollution monitoring project.In this paper,in acidic solution,standard solution titration with Fe2＋ and Cr（Ⅵ）,it reduced to Cr3＋.With diphenylamine sulfonate as indicator,according to the volume of consumed in Fe2＋ standard solution calculated the content of Cr（Ⅵ）（mg L） in the water.The experiment is simple and fast and satisfactory results were obtained by measuring the actual sample.