Determination of cadmium in water samples by fast pyrolysis-chemical vapor generation atomic fluorescence spectrometry

作者：Zhang, Jingya; Fang, Jinliang; Duan, Xuchuan^*

来源：Spectrochimica Acta Part B: Atomic Spectroscopy , 2016, 122: 52-55.

DOI：10.1016/j.sab.2016.05.009

• Sodium formate
• Pyrolysis vapor generation
• Cadmium
• Water sample
• Atomic fluorescence spectrometry

A pyrolysis-vapor generation procedure to determine cadmium by atomic fluorescence spectrometry has been established. Under fast pyrolysis, cadmium ion can be reduced to volatile cadmium species by sodium formate. The presence of thiourea enhanced the efficiency of cadmium vapor generation and eliminated the interference of copper. The possible mechanism of vapor generation of cadmium was discussed. The optimization of the parameters for pyrolysis-chemical vapor generation, including pyrolysis temperature, amount of sodium formate, concentration of hydrochloric acid, and carrier argon flow rate were carried out. Under the optimized conditions, the absolute and concentration detection limits were 0.38 ng and 2.2 ng ml(-1), respectively, assuming that 0.17 ml of sample was injected. The generation efficiency of was 28-37%. The method was successfully applied to determine trace amounts of cadmium in two certified reference materials of Environmental Water (GSB07-1185-2000 and GSBZ 50009-88). The results were in good agreement with the certified reference values.

• 出版日期2016-8-1
• 单位天津师范大学