Determination of 8 trace elements in selenium enriched tea by microwave digestion-inductively coupled plasma-mass spectrometry
GAO Hang, WANG Xiao, JIANG Fei, ZHANG Na
The Northwest Geological Institute of Nonferrous Metals, Xi'an 710054, China
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0.100 0 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0.000 7～0.034 3 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。
Abstract：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. 0.100 0 g sample was weighed and put into the teflon digestion tank, added 3 mL HNO, placed it for 1 h, digested according to the 3 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 0.000 7-0.034 3 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.
Keywords：selenium enriched tea; microwave digestion; inductively coupled plasma mass spectrometry; traceelements
GAO Hang，WANG Xiao，JIANG Fei，et al. Determination of 8 trace elements in selenium enriched tea by microwave digestion-inductively coupled plasma-mass spectrometry[J]. Chemical Analysis and Meterage，2022，31(6)：59.