电感耦合等离子体质谱(ICP-MS)法测定农产品地土壤中铅、镉、铬消解方法的改进

采用赶酸电热板消解农产品地土壤中的重金属,电感耦合等离子体质谱(ICP-MS)法同时测定土壤中的铅、镉、铬。研究了酸体系及酸用量、赶酸电热板的升温程序,确定了最佳消解条件。通过统计50个批次土壤样品中加入的质控样,做出质控图,结果表明:各元素测定值均落在中心附近、上下警告线之内,批次内平行样品各元素相对标准偏差均小于5%。方法克服了传统的电热板消解法的缺点,弥补了高压罐消解法和微波消解法的不足,方法快速、准确,适合于大批量样品的分析。

Digestion Method Improvement on the Determination of Lead, Cadmium and Chromium in Agricultural Soil by ICP-MS

The agricultural soil sample was digested on an electric hot plate, and the digestion solution was used to determine the contents of heavy metals such as lead, cadmium and chromium by ICP-MS. Experimental parameters such as the acid volume and the temperature raising procedure of the electric hot plate were studied, and the optimum digestion conditions were obtained. The quality control samples were added into 50 batched of soil samples, Based on the analytical results, a quality control chart was plotted. The results showed that the measured value of each element was all near the center, which was also within the range of upper limit and lower limit of the warning line. The relative standard deviations were lower than 5%. This method not only overcame the shortcoming of traditional electric heating plate digestion method, but also compensated the shortage of high pressure tank digestion and microwave digestion methods. It was proved to be rapid, accurate and suitable for batch analysis.