电感耦合等离子体质谱法测定香菇中的20种元素  

Determination of 20 elements in Lentinus edodes by inductively coupled plasma mass spectrometry( ICP-MS)

作　　者：林少美[1] 陈珞洛[1] 王超[1] 梁晓蓉[1] 郑三燕[1] 吴俊[1] 

机构地区：[1]温州市疾病预防控制中心,浙江温州325000

出　　处：《中国卫生检验杂志》2014年第5期670-673,共4页Chinese Journal of Health Laboratory Technology

基　　金：温州市医药卫生科学研究项目(2012B014)

摘　　要：目的利用电感耦合等离子体技术建立一种能同时检测香菇中20种元素的方法。方法采用微波消解技术处理样品,电感耦合等离子体质谱法同时测定香菇中的铍、硼、钒、铬、锰、钴、镍、铜、锌、砷、硒、锶、钼、银、镉、锑、钡、汞、铊、铅这20种元素。样品前处理采用单硝酸体系。采用优化仪器条件、选择测定元素的最佳同位素和干扰校正方程方法来消除质谱干扰,采用6Li、72Ge、115In、209Bi为内标元素来校正样品的基体干扰和仪器信号的漂移。结果在优化的条件下,获得元素的工作曲线相关系数均大于0.999,检出限在0.00033 mg/kg^0.044 mg/kg之间,方法精密度为1.50%~19.3%,加标回收结果在81.1%~120%之间,绿茶标准物质GBW10052、紫菜标准物质GBW10023的检测结果与参考值相符合。结论本方法快速灵敏,精密度和准确度均符合检测要求,是一种简便快速同时分析香菇中20种元素的方法。Objective To develop a method for analysis of 20 elements in Lentinus edodes by ICP - MS at the same time. Methods After microwave digestion treatment by mononitrate system, 20 elements in Lentinns edodes were determined by inductively coupled plasma mass spectrometry, including Cr, As, Cd, Hg, Pb, etc. Some methods were adopted to eliminate the spectral interference, such as the optimization of instrument conditions, the selection of the best isotope and the correction equation. 6Li, 72Ge, 115 In and 209Bi were chosen as internal standard elements to reduce the matrix interference and the instrument signal drift. Results Under the optimized conditions, the linear correlation coefficient of all elements was greater than 0. 999, the detection limits varied from 0. 00033 mg/kg to 0. 044 mg/kg, the relative standard deviations were from 1.50% to 19.3% , the recovery ratios were 81.1% - 120%. By the method, the analysis results of 20 elements in GBWlO052 and GBW10023 were consistent with the certified values. Conclusion The method was simple and rapid for analysis of 20 elements in Lentinus edodes, due to satisfying sensitivity, precision and accuracy.

关 键 词：电感耦合等离子体质谱(ICP—MS) 香菇 元素 微波消解 

分 类 号：O657.63[理学—分析化学]