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

摘要

[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、0.093 μg/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 jxg/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.