Determination of Copper, Lead, Cadmium and Zinc in Water by Square Wave Polarography with Dithizone-Chloroform Extraction Method

[摘要] 500 ml of a sample water was extracted with 10 ml of 0.01 % dithizone-CHCl3 three times. When CHCl3 layer was back extracted with 10 ml of 0.1 N HCl containing mercuric ion, the free metal ions come into aqueous layer. The aqueous layer was added with 2 ml of 2 N KCl and was washed with 10 ml of CHCl3 two times in order to remove the trace dithizone, and then was recorded square wave polarogram. The concentration of copper, lead and cadmium can be determined up to 3 ppb and that of zinc up to 14 ppb with an error of 10 %.

[学科分类] 化学（综合）