砷铈催化分光光度法测定盐碘含量的方法研究  

Determination of iodine in salt by arsenic-cerium catalytic spectrophotometry

作　　者：李叶 魏竞智 夏卫文 段妮 郭磊磊 Li Ye;Wei Jingzhi;Xia Weiwen;Duan Ni;Guo Leilei(Department of Clinical Laboratory,Jintan District Center for Disease Control and Prevention,Changzhou 213200,China)

机构地区：[1]江苏省常州市金坛区疾病预防控制中心检验科,常州213200

出　　处：《中华地方病学杂志》2022年第4期323-326,共4页Chinese Journal of Endemiology

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0~150μg/L标准曲线范围内,相关系数(r)=-0.9999,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。Objective 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 0-150μg/L standard curve,the correlation coefficient(r)=-0.9999,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.

关 键 词：盐类 碘 砷铈催化分光光度法 

分 类 号：TS37[轻工技术与工程] O657.3[理学—分析化学]