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Spectrophotometric Determination of Iodine in Table Salt by Oxidation-Decoloration of Butyl Rhodamine B
Author(s): TANG Ning-li
Pages: 121-
123
Year: 2006
Issue:
2
Journal: GUANGXI SCIENCES
Keyword: 碘; 食盐; 丁基罗丹明B; 氧化褪色; 分光光度法;
Abstract: 在H2SO4介质中,KBr存在下,碘酸根氧化丁基罗丹明B使之褪色,褪色程度与碘酸根的量有关,据此建立了褪色光度法测定碘的新方法.新方法用于测定加碘食盐中碘含量的最大吸收波长为560nm,碘浓度在0~400μg/L范围内与丁基罗丹明B褪色程度呈线性关系,表观摩尔吸光系数ε560=9.27×104L·mol-1·cm-1.新方法的灵敏度高,室温可以进行反应,操作简便,用于加碘食盐中碘含量测定的结果令人满意.
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