石墨消解-电感耦合等离子体发射质谱法测定土壤中9种重金属元素

Determination of 9 Heavy Metal Elements in Soil by Graphite Digestion-Inductively Coupled Plasma Emission Mass Spectrometry

建立了硝酸-氢氟酸-高氯酸-逆王水消解,电感耦合等离子体发射质谱法测定土壤中铜、铅、锌、铬、镍、镉、钴、铊、铍9种金属元素含量的方法。选用编号为TR230006、TR230007、TR230008的实际样品和GBW07981(GSS-39)的标准物质进行测定,并以此研究了分析方法的线性和范围、精密度、准确度等。结果显示:本文测定9种土壤重金属元素的质量浓度与以经内标校正后的对应元素信号响应值呈良好的线性关系,相关系数≥0.999,方法的检出限为0.01~1.74 mg/kg,精密度实验相对标准偏差为0.11%~2.38%,标准物质分析测定的相对误差为-0.79%~1.96%。本方法检出限低,精密度高,适用于土壤中多种重金属元素的测定。

In this paper,a method for the determination of nine heavy metals in soil by inductively coupled plasma emission mass spectrometry with nitric acid-hydrofluoric acid-perchloric acid-reverse aqua regia digestion was established.The actual samples numbered ST230006,ST230007 and ST230008 and the standard substance of GBW07981(GSS-39)were selected for determination,and the linearity,range,precision and accuracy of the analysis method were studied.The results show that there is a good linear relationship between the mass concentrations of nine soil heavy metal elements determined in this paper and the signal response values of corresponding elements corrected by internal standard,and the correlation coefficient is≥0.999.The detection limit of the method is 0.01~1.74 mg/kg,the relative standard deviation of precision test is 0.11%~2.38%,and the relative error of standard substance analysis is-0.79%~1.96%.From the above,this method has low detection limit and high precision,and is suitable for the determination of various heavy metal elements in soil.