二甲基砷溶液标准物质的研制

Preparation of Dimethylarsinic Reference Material

以高纯度的二甲基砷酸钠为原料,采用重量法制备了二甲基砷溶液标准物质。在对制备的标准物质进行定性检测的基础上,通过高效液相色谱-电感耦合等离子体质谱法对制备的标准物质进行比较法定值。同时,对标准物质的均匀性、稳定性进行考察。二甲基砷溶液标准物质的质量浓度为22. 1μg/g,扩展不确定度为U=0. 8μg/g(k=2),有效期为12个月。

Dimethylarsinic reference material was prepared using high purity sodium dimethylarsinate as raw materials by weighting method.On basis of quality analysis,the certified value was defined by the comparing with primary reference material by means of HPLC-ICP-MS.In addition,the checking of uniformity and stability test were systematically studied.The result revealed the certified value of the reference material was 22. 1 μg/g with expanded uncertainty of U = 0. 8 μg/g( k = 2) while its valid was 12 months.