铅、镉、砷、汞、铜混合对照品溶液的定值及不确定度评估研究

目的：对铅、镉、砷、汞、铜混合对照品溶液准确赋值，并评估定值的不确定度。方法：采用电感耦合等离子体质谱法（ICP-MS法），以铅、镉、砷、汞、铜5种元素为指标，联合7家实验室对混合对照品溶液协作定值，并评估不确定性。结果：铅、镉、砷、汞、铜各元素标准值和扩展不确定度分别为（198.7±6.1）μg·mL^-1、（10.0±0.3）μg·mL^-1、（103.2±3.6）μg·mL^-1、（10.0±0.7）μg·mL^-1、（1 007.5±24.6）μg·mL^-1。结论：通过协作定值及不确定度评估可实现铅、镉、砷、汞、铜混合对照品溶液准确赋值。

Objective: To specify the mixed reference solution of Pb,Cd,As,Hg,Cu and evaluate the uncertainty of the results. Methods: The mixed reference solution was investigated by determination of Pb,Cd,As,Hg,Cu using ICP-MS. Seven laboratories participated in the collaborative calibration study.The uncertainties of results were evaluated.Results: The standard values and extended uncertainties of Pb,Cd,As,Hg,Cu were(198.7±6.1) μg·mL^-1,(10.0±0.3) μg·mL^-1,(103.2±3.6) μg·mL^-1,(10.0±0.7) μg·mL^-1, (1 007.5±24.6) μg·mL^-1,respectively. Conclusion: The mixed reference solution of Pb,Cd,As,Hg,Cu was specified based on the results of collaborative calibration and uncertainty evaluation.

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