摘要
研究了碘酸钾、碘化钾与甲基紫在盐酸介质中的显色反应 ,反应产物之最大吸收波长λmax为 650nm ,并由此建立了一个简单、快速、实用的分光光度测定食盐中微量碘酸钾的新方法。在最佳实验条件下 ,碘酸钾质量浓度在 0～ 1 60 μg/ 2 5mL内服从比耳定律 ,其线性相关系数r为 0 .9996。本法用于加碘食盐中微量碘酸钾的测定 。
A new simple,rapid spectrophotometric method for the determination of potassium iodate in salt was studied,which based on chromogenic reaction of methy1 violet with potassium iodate and potassium iodide in HCl medium.The maximum absorption of the reaction product lies at 650nm and beer's law is obeyed over the concentration range of 0～160μg/25mL potassium iodate with the regression coefficient r 0.9991.The satisfactory results have been obtained in agreement with those by ultraviolet spectrophotometric method when applying the proposed method to determination of potassium iodate in salt samples.
出处
《广州化学》
CAS
1999年第4期44-48,共5页
Guangzhou Chemistry
