水中碘离子溶液标准物质研制

Preparation of the Reference Material of Iodide in Water

研制了水中碘离子溶液标准物质。采用杂质扣除法和硝酸银电位滴定法两种不同原理的方法确定原材料碘化钾的纯度。最终确定碘化钾纯度为99.80%,相对扩展不确定度为0. 26%(k=2);采用重量-容量法配制水中碘离子溶液标准物质,并采用F检验和趋势线检验考查该标准物质的均匀性和稳定性。结果表明,研制的标称值为100 mg/L的水中碘离子溶液标准物质具有良好的均匀性和稳定性,相对扩展不确定度为1%(k=2)。该标准物质可用来校准仪器和评价分析检测方法。

The reference material of iodide in water was prepared.The purity of potassium iodide was 99. 80% and the relative expanded uncertainty was 0. 26%( k = 2),which was determined by deducting impurities and silver nitrate titration. The reference material of iodide in water was prepared by weight-volumetric method,and F test and trend line were carried out for the reference material.The results showed that the standard value of the reference material of iodide in water was 100 mg/L,and the relative expanded uncertainty was 1%( k = 2).The reference material has good uniformity and stability.It can be used for the evaluation of iodide analysis and the calibration of the instrument.