毒死蜱D_(10)溶液标准物质的制备及定值

Preparation and Certifi cation of Chlorpyrifos-D_(10) in Solution Reference Material

介绍毒死蜱D_(10)溶液标准物质的制备及定值方法。采用稳定同位素标记物毒死蜱D_(10)为原料,丙酮为溶剂,经定量称取和定体积溶解,制备了质量浓度为100 mg/L的毒死蜱D_(10)溶液标准物质。分别用F检验法和直线拟合法对制得的毒死蜱D_(10)溶液标准物质进行均匀性和稳定性验证,结果表明,研制的标准物质均匀性良好,在20℃,4℃,–25℃下可稳定存放半年,定值结果的扩展不确定度为1.6 mg/L(k=2)。

The method to prepare Chlorpyrifos-D10 solution reference material was introduced. Chlorpyrifos-D10 solution reference material of 100 mg/L was prepared by using purity reference material by weight–volumetric method. The uniformity and stability of standard solution were examined byF test and regression curve method respectively. The result showed that the homogeneity met the requirement of reference material, and the reference material was stable for half a year at 20℃, 4℃ and –25℃. The expanded uncertainty was 1.6 mg/L (k=2).