碘盐中微量碘的定量分析是碘盐监测工作中的重要一环。目前,碘酸钾碘盐的定量测定方法主要采用以H3PO4酸化后的直接滴定法[1]。直接滴定法简便、快速,为保证测定结果的准确性,必须对检测过程的关键环节采取有效的质量控制措施。1检测试剂的质量控制[2]1.1硫代硫酸钠(Na2S2O3)标 Quantitative analysis of trace iodine in iodized salt is an important part of iodized salt monitoring. At present, the quantitative determination method of iodized potassium iodate mainly adopts the direct titration method after acidification with H3PO4 [1]. Direct titration is simple and rapid. To ensure the accuracy of the determination results, effective quality control measures must be taken in the key aspects of the detection process. A test reagent quality control [2] 1.1 sodium thiosulfate (Na2S2O3) standard