ICP-MS同时测定土壤中Cr、Ni、Cu、As、Tl和Pb

建立起HNO₃-H₂O₂-HF体系微波消解前处理样品，利用电感耦合等离子体质谱（ICP-MS）同时测定土壤中的铬（Cr）、镍（Ni）、铜（Cu）、砷（As）、铊（Tl）、铅（Pb）6种重金属元素含量的方法。该方法的相关系数在0.9996~1.000，相对标准偏差在0.669~3.02%，加标回收率为94.68~115.5%，检出限为2.004~312.4 ng/L，结果表明该方法满足重金属分析的要求。用建立起的方法测定了来自7个省45个产区烟田土壤中的Cr、Ni、Cu、As、Tl和Pb 6种重金属元素含量；与对应烟叶中的6种重金属含量相比，聚类分析结果表明不同省区间土壤中的重金属含量无明显差异，而烟叶中却差异明显。 

Simultaneous determination of Cr,Ni,Cu,As,Tl and Pb in soil by inductively coupled plasma mass spectrometry

A combination of HNO_3-H_2O_2-HF was used for microwave digestion.Method for simultaneous determination of Cr,Ni,Cu,As,Tl,and Pb in soil by inductively coupled plasma mass spectrometry(ICP-MS)Wag developed.The linear correlation factors were from 0.9996 to 1.000.The relative standard deviations of measurement were from 0.669% to 3.02%.The recoveries for spiking soil samples and the limits of detection were in the range of 94.68-115.5%and 2.004-312.4 ng/L,respectively.The results showed that the method met the requirements of trace element analysis.The content of Cr,Ni,Cu,As,Tl,and Pb in soil from 45 areas in 7 provinces including Hunan,Hubei,Yunnan,Guizhou,Henan,Fujian,and Liaoning were simultaneously determined by ICP-MS.The differentiation of 6 heavy metal contents in soil and tobacco from different provinces were studied.Cluster analysis report showed that the differentiation of 6 heavy metal contents was significant in tobacco but non-significant in soil.