Simultaneous Determination of Zinc, Cadmium, Lead and Copper in Tungsten Matrix by Differential Pulse Anodic Stripping Voltammetry

摘要

The simultaneous determination of Zn, Cd, Pb and Cu in 1.000%(w/v) tungsten matrix by differential pulse anodic stripping voltammetry at a hanging mercury drop electrode has been studied. Tartaric acid(pH=5.00) was used as a supporting electrolyte. Optimum analytical conditions were found that the deposition potential was -1.2 volt(vs. Ag/AgCl), the deposition time was 3 minutes. The linear concentration range of all trace metal ions in 1.000%(w/v) tungsten matrix were 10 to 50 ppb. And the detection limit(3￥ò) of zinc, cadmium, lead and copper were 1.25, 1.02, 1.69, and 1.02 ppb respectively. This method was superior to the ICP-AES method which detection limits(3￥ò) in 1.000%(w/v) tungsten matrix were 8.0, 5.0, 120 and 5 ppb respectively.