测定摄入碘酸钾碘盐人群尿中碘形态的方法讨论

Different methods in assessing iodine speciation in urine of people ingested iodate iodized salt

目前国内对食用碘酸钾碘盐人群尿中是否含碘酸根离子（IO3^-）的测定方法有碘离子选择性电极测定法、对苯二胺比色测定法、在线分离在线消化-流动注射砷铈催化光度测定法.对这3种测定方法及其结果的可靠性和可信性进行分析发现,碘离子选择性电极测定法和对苯二胺比色测定法没有消除尿成分的严重干扰,测定特异性差.在线分离在线消化-流动注射砷铈催化光度测定法特异性好、灵敏度高、准确度好,其得到摄入碘酸钾碘盐人群尿中无IO3^-形态排出.

At present, the methods to analyze IO3^-in urine of human ingested edible salt iodized with potassium iodate include the iodine ion selective electrode analysis method, para-phenylene diamine colorimetric method and flow injection arsenite ceric catalytic spectrophotometry with online ion exchangeonline digestion（IE-FIA）.In studies comparing the reliability of these methods and their results, it is found that iodine ion selective electrodeanalysis method and para-phenylene diamine colorimetric method did not eliminate the serious interference of urine compositions, and their determining specificity was lower.IE-FIA had the characteristics of high specificity, sensitivity and accuracy,and no IO3-ions was found in urine of people ingested KIO3^- iodized salt.