硼砂存在下茜素红S作为络合滴定锌指示剂的研究

Study on alizarin red S as an indicator of the complexometric titration of zinc in borax buffer solution

研究了在硼砂缓冲体系中茜素红S(ARS)作为络合滴定锌指示剂的分析性能.结果表明,在pH 9.2的硼砂缓冲体系中,加入6滴ARS指示剂,用EDTA标准溶液进行目视滴定,滴定终点溶液由红色变为亮黄色,变色敏锐,准确度较高,具有一定的应用价值.

Alizarin red S as an indicator for the eomplexometrie titration of zinc was studied in borax buffer solution. The results showed that the end-point for the titration of zinc with six drops of the reagent was sharper in pH 9.2 borax buffer solution. The color of solution at the end-point changed from red to light yellow. The method had been successfully used to determinate zinc in zinc salt and zinc metal with satisfactory results.