摘要目的:建立砷铈催化分光光度法测定盐碘含量的方法。方法:应用全自动碘分析仪，通过砷铈催化分光光度法检测盐碘含量，评价该方法的标准曲线线性关系、检出限、精密度、准确度。应用该方法与直接滴定法同时检测20份食用盐样品碘含量，并进行结果比对。结果:在0 ~ 150 μg/L标准曲线范围内，相关系数（ r） = - 0.999 9，检出限为1.4 mg/kg。碘成份分析标准物质GBW10006z、GBW10007z测定均值分别为12.2、22.8 mg/kg（ n = 6），均在给定标准值范围内，相对标准偏差（ RSD）分别为2.04%、2.33%。碘成份分析标准物质GBW10006b、GBW10007b、GBW10006v、GBW10007v、GBW10006z、GBW10007z测定结果（12.0、24.6、12.6、22.8、12.3、23.2 mg/kg， n = 2）均在给定标准值范围内，具有良好的质控性。分别应用砷铈催化分光光度法与直接滴定法检测20份食用盐样品碘含量，结果比较差异无统计学意义（ t = 1.99， P = 0.060）。 结论:应用砷铈催化分光光度法检测盐碘含量具有标准曲线线性关系好、检出限低、精密度好、准确度高等特点，适合推广应用。

abstractsObjective:To establish a method for determination of iodine in salt by arsenic-cerium catalytic spectrophotometry.Methods:The content of iodine in salt was detected by arsenic-cerium catalytic spectrophotometry with an automatic iodine analyzer. The standard curve linearity, detection limit, precision and accuracy of the method were evaluated. The iodine content of 20 edible salt samples was detected by the newly established method and direct titration, and the results were compared.Results:In the range of 0 - 150 μg/L standard curve, the correlation coefficient ( r) = - 0.999 9, and the detection limit was 1.4 mg/kg. The average iodine contents of iodine composition analysis standard materials GBW10006z and GBW10007z were 12.2 and 22.8 mg/kg ( n = 6), respectively, which were all within the given standard value ranges, and the relative standard deviations ( RSD) were 2.04% and 2.33%, respectively. Iodine composition analysis standard materials GBW10006b, GBW10007b, GBW10006v, GBW10007v, GBW10006z and GBW10007z measurement results (12.0, 24.6, 12.6, 22.8, 12.3, 23.2 mg/kg, n = 2) were all within the given standard value ranges, with good quality control. The iodine content of 20 edible salt samples was detected by arsenic-cerium catalytic spectrophotometry and direct titration, respectively, and the difference was not statistically significant ( t = 1.99, P = 0.060). Conclusion:Arsenic-cerium catalytic spectrophotometry has the characteristics of good linear relationship, low detection limit, good precision and high accuracy in determination of salt iodine content, which is suitable for popularization and application.