摘要
为建立同时检测干制水产品中铅、砷、铝、铬、铁、铜金属残留的电感耦合等离子体质谱(Inductively coupled plasma mass spectrometry,ICP-MS)方法。选择自动石墨消解仪对样品进行消解,消解完全后,利用ICP-MS对样液进行检测,内标法定量分析。结果显示:铅、砷、铝、铬、铁、铜元素浓度在0. 25～25μg/L范围内线性良好,相关系数(R2)均大于0. 990;检测限:铅0. 02μg/L、砷0. 08μg/L、铝0. 12μg/L、铬0. 10μg/L、铁0. 03μg/L、铜0. 05μg/L;加标回收率在84. 0%～108. 4%之间;方法重复性RSD(n=6)低于10%。该方法操作简单、准确度高、检测限低、重复性好,可以用于干制水产品中的金属元素检测。
This study aimed to establish a method that uses inductively coupled plasma mass spectrometry(ICPMS) to simultaneously determine lead,arsenic,aluminum,chromium,iron,and copper in dried aquatic products.Samples were digested in automatic graphite digestion,followed by quantitative tests using internal standard method by ICP-MS. The results showed that the concentrations of lead,arsenic,aluminum,chromium,iron,and copper showed good linear relationships in the range of 0. 25-25 μg/L,with correlation coefficients(R2) higher than 0. 990. The detection limits for lead,arsenic,aluminum,chromium,iron,and copper were 0. 02 μg/L,0. 08 μg/L,0. 12 μg/L,0. 10 μg/L,0. 03 μg/L,and 0. 05 μg/L,respectively. The recovery rate was 84. 0%-108. 4%. The relative standard deviation of reproducibility was less than 10%(n = 6). This method was proved to be simple,accurate,with low detection limits and good reproducibility,which can be used to detect metals in dried aquatic products.
引文
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