基于碘酸盐在肼存在下对溴酸盐与氯离子反应的加速作用，建立灵敏的动力学分光光度法测定加碘食盐中的碘酸盐。

Sensitive kinetic-spectrophotometric determination of iodate in iodized table salt based on its accelerating effect on the reaction of bromate with chloride ion in the presence of hydrazine.

作者信息

Afkhami Abbas, Mosaed Fatemeh

机构信息

Department of Chemistry, Faculty of Sciences, Bu-Ali Sina University, Hamadan, Iran.

出版信息

Anal Sci. 2002 Jun;18(6):667-70. doi: 10.2116/analsci.18.667.

DOI:10.2116/analsci.18.667

PMID:12083552

Abstract

A simple, precise, sensitive and accurate method was developed for rapid determination of trace quantities of iodate. The method is based on the accelerating effect of iodate on the reaction of bromate and chloride acid in the presence of hydrazine in acidic media. The decolorization of Methyl Orange with the reaction products was used to monitor the reaction spectrophotometrically at 525 nm. Iodate could be determined in the concentration ranges of 0.03 - 1.2 microg ml(-1). The relative standard deviation for ten replicate determinations of 0.3 microg ml(-1) of iodate was 1.65%. The proposed method was applied to the determination of iodate in table salts with satisfactory results.

摘要

开发了一种简单、精确、灵敏且准确的方法用于快速测定痕量碘酸盐。该方法基于在酸性介质中，碘酸盐在肼存在下对溴酸盐与盐酸反应的加速作用。利用反应产物使甲基橙褪色，在525 nm处通过分光光度法监测反应。碘酸盐的测定浓度范围为0.03 - 1.2 μg ml⁻¹。对0.3 μg ml⁻¹碘酸盐进行十次重复测定的相对标准偏差为1.65%。所提出的方法应用于食盐中碘酸盐的测定，结果令人满意。