偶氮胂Ⅲ褪色光度法测定食盐中碘的研究  

Study on the Spectrophotometric Determination of Iodine in Celery Salt by Decoloration of Arsenazo Ⅲ

作　　者：黄典文[1] 卢业玉[1] 区良益[1] 

机构地区：[1]广东工业大学轻工化工学院,广东广州510090

出　　处：《广东工业大学学报》2003年第3期68-70,75,共4页Journal of Guangdong University of Technology

摘　　要：在H_2SO_4-KBr介质中,碘酸根能氧化偶氮胂Ⅲ使之褪色,且褪色的程度与KIO_3的存在量呈线性关系,借此建立了分光光度法测定碘的新方法。在选定条件下,有色溶液的最大吸收波长为530nm,碘的含量在0～4mg/L范围内符合比尔定律,表观摩尔吸光系数为2.07×10~3m^2/mol。方法简单、快速、准确、选择性好,在用于测定加碘食盐中的微量碘时,结果满意。A new spectrophotometric determination of iodine based on the decoloration of arsenazoⅢ by io- date in H_2SO_4 medium is reported. The maximum absorption is at 530nm. Beer's law is obeyed from 0 to 4mg/L for iodine. The apperent molar absorptivity is 2.07×103m^2/mol.The method has been used for the determination of iodine in celery salt with satisfactory results.

关 键 词：碘 偶氮胂Ⅲ 褪色反应 分光光度法 

分 类 号：O657.3[理学—分析化学]