盐酸标准物质的研制

Preparation of the CRM of hydrochloric acid

本文介绍了盐酸标准物质的研制程序，其中包括溶液的配制、均匀性和稳定性检验、分析方法和数据统计处理方法等。并选择了具有高准确度的精密库仑法和自动电位滴定法分析定值，对制备浓度为０．００６ｍｏｌ／ｄｍ３盐酸标准物质，其定值的相对不确定度可达０．２％，稳定期在一年以上。

his paper describes preparation procedure of the CRM of hydrochloric acid solution forthe determination of seawater alkalinity. The procedure includes the solution preparation, ho mogeneity check, stability check, analytical methods and statistical methods of data processing.Two analytical methods were adopted for certification value, i. e. Precise coulomb and automatic potential tiration methods are of high accuracy, The certified relative uncertainty for 0. 006 mol/dm3 concentration of the hydrochloric acid solution is 0. 2%' The Stability term is over one year.