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建立了刺梨和无籽刺梨中痕量重金属元素的分析方法。采用微波消解-电感耦合等离子体质谱法(ICPMS)测定了As、Bi、Cd、Co、Cr、Ni、Pb、Sb和Sn共9种元素。结果显示,各元素在质量浓度范围0~100μg/L内线性良好,相关系数R≥0.999 8,ICP-MS对所测定重金属元素的方法检出限为0.150~9.495μg/kg,定量限为1.50~94.95μg/kg,精密度试验相对标准偏差为1.03%~4.71%,加标回收率在93.3%~102.4%之间。利用该方法分析了国家标准物质黄芪(GBW 10028),结果与证书值相符。该方法可快速、准确地测定刺梨和无籽刺梨中痕量重金属元素。
A method for the analysis of trace heavy metals in prickly pear and seedless prickly pear was established. Nine elements of As, Bi, Cd, Co, Cr, Ni, Pb, Sb and Sn were determined by microwave digestion-inductively coupled plasma mass spectrometry (ICPMS) The results showed that the linearity of each element was good in the range of 0-100 μg / L with the correlation coefficient R ≥ 0.998. The detection limits of heavy metal elements by ICP-MS were 0.150-9.495 μg / kg and the limits of quantification were 1.50 ~ 94.95μg / kg. The relative standard deviations (RSDs) of precision tests were 1.03% ~ 4.71%, and the recovery rates were between 93.3% ~ 102.4%. Using this method, the national standard substance astragalus (GBW 10028) was analyzed and the result was consistent with the certificate value. The method can quickly and accurately determine the trace heavy metals in prickly pear and seedless prickly pear.