浓盐水中SO_(4)^(2-)含量测定方法探讨

Discussion on Determination Method of SO_(4)^(2-) Content in Concentrated Brine

为满足环保要求,实现废水盐含量的达标排放,实施了外排废水-脱盐达标排放改造项目,简要介绍了项目的工艺流程及严格控制SO_(4)^(2-)含量的重要性。为确保项目建成后稳定运行,采用离子色谱法、铬酸钡分光光度法、哈希试剂法等3种方法分别测定水中SO_(4)^(2-)含量。结果表明:离子色谱法操作简单、响应灵敏,可有效消除干扰,重现性较好,精密度和准确度较高;哈希试剂法准确度好,但受杂散光影响较大,重现性稍差,分析试剂包成本偏高;铬酸钡分光光度法操作过程较烦琐,分析耗时较长,数据的重现性及准确度低于前两种分析方法。

In order to meet the requirements of environmental protection and realize the standard discharge of wastewater salt content,the transformation project of effluent desalination standard discharge is implemented.The process flow of the project and the importance of strictly controlling SO_(4)^(2-)content are being briefly introduced.In order to ensure the stable operation after the completion of the project,three methods such as ion chromatography,barium chromate spectrophotometry and HACH reagent method are used to determine the SO_(4)^(2-)content in water respectively.The results show that ion chromatography has the advantages of simple operation,sensitive response,effective elimination of interference,good reproducibility,high precision and accuracy.The HACH reagent method has good accuracy,but it is greatly affected by stray light.The reproducibility is slightly poor,and the cost of analytical reagent package is high.Furthermore,the operation process of barium chromate spectrophotometry is cumbersome,the analysis time is long,and the reproducibility and accuracy of data are lower than the first two analysis methods.