微波消解-ICP-oaTOF-MS法检测烟田土壤中Cr·As·Cd·Hg·Pb的研究

Microwave Digestion-ICP-oaTOF-MS Method for the Determination of Cr,As,Cd,Hg and Pb in Tobacco Soil

[目的]研究烟草土壤中几种重金属元素含量的测定方法。[方法]采用微波密闭消解-电感耦合等离子体直角加速飞行时间质谱(ICP-oaTOF-MS)法,分析了烟田土壤中Cr、As、Cd、Hg、Pb 5种元素含量。同时,研究了影响其测量的主要因素,确定了最佳测定条件。[结果]Cr、As、Cd、Hg、Pb检出限分别为0.090、0.130、0.083、0.090、0.093μg/L,回收率为90.67%～100.62%,RSD低于5%。[结论]与其他方法相比,所建立的方法具有简便、快速、准确、灵敏度高、检测限低等优点,特别是对一些浓度低达ng/L级的超痕量组分的检测,但高质量的丰度灵敏度要差一些,可用于烟叶重金属检测、质量控制。

[Objective] To study the determination methods of heavy metal elements contents in tobacco soil.[Method] The five trace elements of Cr,As,Cd,Hg and Pb in tobacco soil were analyzed by inductively coupled plasma orthogonal acceleration time of flight-mass spectrometry（ICP-oaTOF-MS）.Factors affecting the determination were analyzed in details.The optimum condition for the determination was obtained.[Result] The limits of determination for Cr,As,Cd,Hg and Pb were 0.090,0.130,0.083,0.090,and 0.093 μg/L,respectively.The recycling rates ranged from 90.67% to 100.62%.RSD was less than 5%.[Conclusion] Compared with other methods,this method is simple,fast and accurate with high sensitivity,especially for the determination of some ultratrace elements with low concentration of ng/L.However,the abundance and sensitivity of high-quality end are worse,thus it can be used in the heavy metal detection and quality control for tobacco.