钙红(NN)指示剂褪色分光光度法测定食盐中的碘  

Oxidation-decoloration Spectrophotometry Determination of Iodine in Table Salt with NN

作　　者：孙涛[1] 张新坤[2] 张连忠[3] 

机构地区：[1]唐山师范学院化学系,河北唐山063000 [2]河北理工大学轻工学院,河北唐山063000 [3]唐山师范学院生命科学系,河北唐山063000

出　　处：《唐山师范学院学报》2010年第5期15-16,共2页Journal of Tangshan Normal University

摘　　要：在盐酸介质中,碘酸钾与钙红反应褪色程度与碘酸根浓度在一定范围内呈线性关系,以此建立了碘的光度测定新方法。方法的最大吸收波长在510nm处,碘定量测定的线性范围为0-3mg/L,摩尔吸光系数ε=1.3×104L/mol·cm。本法所得结果和国家标准(GB5009.24-85)中规定食盐中碘含量的测定方法相当。A new method has been developed for the determination of trace amount of iodate by NN which has a maximum absorption wavelength at 510nm. The liner range is 0-3mg/L for iodineε=1.3× 10^4L/moL.cm. The method has been used for the determination of iodate in table salt with satisfactory results.

关 键 词：NN试剂 褪色光度法 碘 

分 类 号：O657.3[理学—分析化学]