直接滴定分析法测定纯碱中硫酸根含量

Determination of Sulfate Radical in Sodium Carbonate by Direct Titrimetry

本法研究了用偶氮氯磷Ⅲ作指示剂，三氯化钡标准溶液作滴定剂的直接滴定法测定碳酸钠硫酸根，结果表明，在ｐＨ１．８～２．４的范围内可获得最满意的结果，该法简便、快速、准确，适用于成品碳酸钠中ＳＯ_４^（２－）测定和生产过程的中间控制分析。

Chlorophosphonazo Ⅲ(as indicator) and standard solution of B_aCl_2 (as titration solution)were used to measure SO_4￣(2-) in Na_2CO_3.Satisfactory results were obtained at values of l.8￣2. 4 pH.The method is simple,fast and accurate and suitable for determination of SO_4￣(2-) in Na_2CO_3 product and control analysis in production process of N_sCO_3.