镁基复盐的EDTA间接滴定法快速检测海藻盐中的硫酸根

Rapid detection of sulfate ion for indirect titration of EDTA magnesium-based salt

建立基于镁盐Mg-EDTA间接滴定法快速检测海藻盐中SO42-的方法。方法:在NH4·H2O缓冲液介质中,用铬黑T作指示剂,采用Mg-EDTA反应体系结合EDTA间接滴定法检测食盐中SO42-含量。结果:实验结果表明,本法回收率范围为92.0%～92.7%,相对标准偏差为3.60%,实际样品测定满足精密度和回收率要求。结论:该方法具有操作简单、反应灵敏、终点易辨、分析快速等特点。

Objective： A method for rapid detection of sulfate ion in marine alga iodine salt by indirect titration of magnesium salt Mg-EDTA was established. Methods： In the medium of ammonia water buffer, the content of sul-fate in salt was detected by Mg-EDTA reaction system and EDTA indirect titration with criochrome black T as in-dicator. Results： The recovery rate is 92.0%-92.7% ,the relative standard deviation is 3.60%. The actual sample meets precision and recovery requirements. Conclusion： This method has the characteristics of simple operation, sensitive reaction, easy identification and rapid analysis, which can meet the needs of quantitative detection for sin-gle and batch samples.