大气中痕量镉、铅的测定

The Analysis of Cadmium and Lead in Air

本文提出在0．05mol／LKCI－0．02mol／LHNO3－0．0025mol／L（CH2）5N4－3×10（－5）mol／LHgCl2体系中，采用微分脉冲阳极溶出伏安技术测定大气中痕量镉、铅，该方法灵敏度高，检测下限达5．0×10（-11）ug／ml（即0．05ppb），样品回收率均在95－105％范围内，十次平行测定结果的相对标准偏差不大于5％。

The article put a new method for determining the Cadmium and lead in air byAnodic Stripping Differential Pulse voltiammetry, in system, 0. 05mol/L KCI-0. 02mol/LHNO3 - 2. 5 ×10-3mol/L (CH2)5N4 -3 ×10-5mol/L HgCl2.This method is sensitive and accu-rate. It's detection limit reach the 5 ×10-11ug/ml (0.05ppb). The recovery rate of samples iscontrolled in 95-105%. It's less than 5% that relative standard deviations of measurmet re-sults of ten time.