固体标准物质绘制工作曲线在ICP—MS法测定土壤中重金属的应用

采用ICP-MS测定土壤中重金属含量，土壤样品因成分复杂而存在一定的基体干扰，选择与土壤样品基体成分相近的固体标准物质绘制工作曲线，并与传统的用标准溶液绘制工作曲线法进行比较，结果表明用固体标准物质绘制工作曲线与用标准溶液绘制工作曲线一样，线性关系好，符合样品测定的要求；应用于ICP-MS测定7种土壤或沉积物样品中Cu，Pb，Zn，Cd，Cr，Ni含量的结果说明，采用固体标准物质绘制工作曲线法，除cr外均存在较小的系统误差，但误差均在允许范围内，其中79％的分析数据的误差优于标准溶液绘制工作曲线法。

Application of Working Curve Drawn Using Solid Standard Substances for Determination of Metal Content in Soil

In order to detect the heavy metals in soil, the ICP-MS technology was utilized. Due to the complexity and matrix interference existed in the soil samples, solid standard substances with similar matrixes were selected to prepare the standard curve. Compared with the standard solution prepared traditional standard curve, the standard curve made by solid standard substance had good linear coefficients similar with which made by standard solution and reached the requirements of sample determination. Both curves were applied to detect Cu, Pb, Zn, Cd, Cr, Ni content in seven soil or sediments by ICP-MS. By the solid standard substances curve, the results showed that the determination errors were all within the permissible range except element Cr with minor systematic error, and 79% analytical data＇ s error was superior to the data obtained under the standard solution prepared curve.