溴百里酚蓝褪色光度法测定食盐中碘的研究  

Research on the Determination of Iodine in Salt by Depigmentation Photometry with Bromothymol Blue

作　　者：张新坤[1] 刘立宅 张相平[3] 

机构地区：[1]河北理工大学轻工学院,河北唐山063000 [2]河北迁安市环境保护局,河北迁安064400 [3]唐山师范学院化学系,河北唐山063000

出　　处：《中国井矿盐》2009年第1期32-33,共2页China Well and Rock Salt

摘　　要：在酸性介质中,溴化钾存在下,碘酸根对溴百里酚蓝有褪色作用,且褪色程度与碘酸根的量有关,从而建立了碘的光度测定新方法。方法的最大吸收波长在430nm处,碘定量测定的线性范围为0～18μg/10mL。方法操作简单,快速、重现性好,用于加碘食盐中碘的测定,结果满意。In the acidic medium with the existence of potassium bromide, the iodate radical has depigmentation function on bromothymol blue, and the degree of depigmentation is related to the amount of iodate, which establishes a new method for photometric determination of iodine. The maximal absorbing wavelengh of this method is at the 430nm and the linearity range for determining the amount of iodine is 0-18μg/10mL. This method is characteristic of easy and fast operation and good reproducibility with satisfactory result.

关 键 词：溴百里酚蓝 褪色光度法 碘 

分 类 号：TS3[轻工技术与工程]