微波消解-电感耦合等离子体质谱法测定富硒茶叶中8种微量元素  

Determination of 8 trace elements in selenium enriched tea by microwave digestion-inductively coupled plasma-mass spectrometry

作　　者：高航 王啸 姜菲 张娜 GAO Hang;WANG Xiao;JIANG Fei;ZHANG Na(The Northwest Geological Institute of Nonferrous Metals,Xi’an 710054,China)

机构地区：[1]西安西北有色地质研究院有限公司,西安710054

出　　处：《化学分析计量》2022年第6期59-62,共4页Chemical Analysis And Meterage

摘　　要：建立微波消解–电感耦合等离子体质谱法测定富硒茶叶中铜、铅、锌、硒、铬、镉、钴、镍8种微量元素的方法。称取茶叶样品0.1000 g,置于聚四氟乙烯消解罐中,加入3 mL硝酸,放置1 h,按照设定的微波消解程序升温消解,采用电感耦合等离子体质谱法测定,以Rh作为内标校正基体效应和基线漂移。8种元素的质量浓度在0~500μg/L范围内与质谱响应值线性良好,相关系数均大于0.999,方法检出限为0.0007~0.0343 mg/kg,测定结果的相对标准偏差为1.3%~4.8%(n=7)。采用所建方法对国家标准物质GBW 10052进行测定,测定值均在标准值不确定度范围内。该方法简便、快速。A method for the determination of 8 trace elements of Cu,Pb,Zn,Se,Cr,Cd,Co and Ni in selenium enriched tea by microwave digestion–inductively coupled plasma–mass spectrometry(ICP–MS)was established.0.1000 g sample was weighed and put into the teflon digestion tank,added 3 mL HNO_(3),placed it for 1 h,digested according to the set microwave digestion procedure,determined by ICP–MS,and Rh was used as the internal standard to correct the matrix effect and baseline drift.The mass concentrations of 8 elements had a good linearity with the mass spectrum response value in the range of 0–500μg/L,the correlation coefficients were more than 0.999,and the detection limits were 0.0007–0.0343 mg/kg.The relative standard deviations of the determination results were 1.3%–4.8%(n=7).The national reference material GBW 10052 was determined by the established method,and the measured values were within the uncertainty range of the standard value.The method is simple and rapid.

关 键 词：富硒茶 微波消解 电感耦合等离子体质谱法 微量元素 

分 类 号：O657.6[理学—分析化学]