电感耦合等离子体质谱法测定土壤中镉和总汞

建立电感耦合等离子质谱法测定土壤中镉和总汞的方法。土壤样品在电热板上用盐酸和硝酸于100℃低温消解,重量法定容,取上清液上机测定。镉和总汞含量分别在0.502~10.20 ng/g,0.212~5.010 ng/g范围内线性良好,相关系数(r2)大于0.999,土壤中镉和总汞的检出限分别为0.021,0.002μg/g,测定结果的相对标准偏差分别为1.99%,5.57%(n=6),加标回收率分别为97.5%~101.1%,87.5%~92.9%。该方法样品处理简单快捷,检出限低,准确度和精密度高,适合土壤中镉和总汞含量的测定。

Determination of Cadmium and Total Mercury in Soil by ICP-MS

A method of ICP-MS was established for the determination of cadmium and total mercury in soil. The sample was dissolved at temperature of 100℃ by hydrochloric acid and nitric acid, being dissolved and dilluted to constant volume, and determined by using supernatant fluid. The linear range of cadmium and mercury was 0.502-10.20 ng/g, 0.212-5.010 ng/g, respectively, the correlation coefficients (r2) were more than 0.999, the detection limits of cadmium and total mercury in soil were 0.021, 0.002 μg/g, respectively. The relative standard deviations of determination results were 1.99％, 5.57％(n=6), and the recoveries were 97.5％-101.1％, 87.5％-92.9％ for calnium and total mercury, respectively. The method is simple and easy to process sample, with low detection limit,high accuracy and precision, and it is suitable for the determination of cadmium and total mercury content in soil.