净水剂聚合氯化铝中硫酸根的硫酸钡比浊测定法

Determination of Sulfate in the Water Purifying Agent Polyaluminium Chloride by Barium Sulfate Turbidimetry

目的简化净水剂聚氯化铝中硫酸根的分析方法。方法对聚氯化铝水溶液采用滤膜过滤,用硫酸钡比浊法定量,加入吐温溶液增加其稳定性。结果硫酸根分析选择波长720nm,线性良好(r=0.9991),精密度(2.7～3.4%)、回收率(92.0～103.2%)良好,结果与国标重量法差异无显著性。结论该方法操作简便快速,适用于实验室批量分析。

Objective To simplify the detection method of sulfate in the water purifying agent poly aluminium chloride.Meth ods Poly aluminium chloride solution was filtered using filterable film and Tween liquor was added to the filtered so lu tion to in crease its stability,then the sulfate content in the solution was determined by barium sulfate turbidimetry.Results The se-lected analytic wave-length of the method was720nm and it showed a good linear relationship with r=0.9991.The coefficient of varia tion and recovery rate were2.7%～3.4%and92.0%～103.2%respectively,which revealed no significant differences com-pared with the results obtained using the national standard determination method,the weight method.Conclusion The method was rapid and easy to operate,which was suitable for determination of batch samples.