酸性红褪色分光光度法测定食盐中碘的含量  

Determination of Iodine in Salts by Fading Spectrophotometic Method with Acid Red 97

作　　者：孙洋[1] 李占清[1] 魏海英[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《中国无机分析化学》2016年第1期65-68,共4页Chinese Journal of Inorganic Analytical Chemistry

基　　金：河北省科技厅科技支撑项目(112764351)资助

摘　　要：研究了在H_2SO_4-KBr的介质中,碘酸钾能够氧化酸性红并使之褪色,且褪色的程度与碘酸根的含量在一定范围内有很好的线性关系,从而建立了一种新的测定碘的方法。实验结果表明,酸性红的最大吸收波长为510nm,碘的含量在0～50μg/50mL范围内,符合比耳定律,其回归方程为△A=0.004 13C+0.032 14,相关系数R2=0.998 3,检出限为0.78μg/50mL。方法操作简单,快速准确,用于食盐中碘含量的测定,结果令人满意。Based on the oxidation color reaction of potassium iodate with acid red 97 in H2SO4 and KBr medium,and the chromomeric extent was linear with the content of iodate,a new spectrophotometric method for the determination of iodine in salts was established.Under the optimized analytical conditions,the maximum absorption wavelength was at 510 nm.Beer＇s law holds in the range of 0~50μg/50 mL,and the linear regression equation was △A=0.004 13C＋0.032 14 with correlation coefficient of R2=0.998 3.The detection limit was 0.78μg/50 mL.The method is simple quick and accurate for the determination of iodine in salts with satisfactory results.

关 键 词：酸性红 褪色分光光度法 碘 

分 类 号：O657.32[理学—分析化学] TH744.12[理学—化学]