铅锌矿区土壤样品经高压密闭消解罐消解处理,采用电感耦合等离子体质谱法测定其中铬、砷、镉、镍、铜、锰、锌、钴和铅等9种微量元素的含量。通过加入盐酸降低硫对铜测定的干扰,运用干扰方程校正光谱干扰,用内标校正消除基体影响。砷的检出限(3s)为1×10-4mg·g-1,其余8种元素的检出限(3s)均为1×10-5mg·g-1。9种元素的回收率在90.1%~109.1%之间。方法用于土壤标准物质(GBW 07401、GBW 07404、GBW 07406)分析,测试结果与标准值相吻合。

The soil sample from lead-zinc ore mining area was digested in a closed vessel under pressure, and the contents of Cr, As, Cd, Ni, Cu, Mn, Zn, Co and Pb in the sample solution were determined by ICP-MS. The interference of S on Cu was eliminated by adding HCl solution, the spectral interferences was corrected by using spectral interference correction equations, and interferences of the matrix elements were eliminated by addition of internal standard. Values of detection limit (3s) of As was found to be 1×10-4mg·g-1, and of the remainder elements were 1×10-5mg·g-1. Values of recovery of the 9 elements found were in the range of 90.1%-109.1%. The proposed method was applied to the analysis of soil CRM′s (GBW 07401, GBW 07404, GBW 07406), the results obtained was in conformity with standard values.