硅酸盐环境标准参考物质中硅的定值方法——氟硅酸钾容量法

Volumetric Method for Silicon Determination in Certified Reference Silicates——Potassium Silieofluoride Volumetry.

本文详细介绍用氟硅酸钾容量法测定硅的最佳实验条件,与其它方法比较,准确度与经典方法相同,而分析速度大大提高,相对标准偏差为0.09—0.17％。对各类硅酸盐、国内粘土标样与美国国家标准局(NBS)标样进行测定比较,均得到满意结果。因此,氟硅酸钾容量法测定硅可推荐为仲裁和标准参考物质定值方法。

The optimal experimental conditions for determining silicon by using the volumetric method of potassium si-licofluoride were presented in this paper. Different types of silicate materials such as clay, glass, refractories, silicate minerals, domestic certified samples and SRM of USNBS are also determined with this method, for which the authors participated the determination of the certified values of silicon in ERM (environmental reference material of soil and pond sediments. After comparing this method with others, it was found that the analytical results of the former one were accurate as those by the classical methods, and its RSD (relative standard deviation)-was 0.09-0.17%. So the volumetric method for potassium silicofluoride can be recommended as an arbitrory method or one for determining the certified value of SRM.