摘要
基于在酸性介质中，碘酸根与对苯二胺发生显色反应，提出了流动注射-分光光度法测定碘酸盐态碘含量的方法。对流动注射体系中盐酸溶液的浓度及二苯胺溶液浓度等反应条件进行了试验及优化。在室温下，当盐酸浓度为0．5mol·L^-1、对苯二胺浓度为10g·L^-1时，该方法的线性范围为0．05-10．0mg·L^-1，检出限（3S／N）为0．0063mg·L^-1，用于2种食盐中碘含量的测定，回收率在99．8％～101．6%之间，相对标准偏差（n=11）为1．07％（1．0mg·L^-1碘酸根）。
Based on the color reaction of iodate with p-phenylenediamine, in dil. HCl medium, a FI- photometric method for determination of iodate in table salt was proposed. Conditions of color reaction in the FI- system, i. e. , the concentrations of HCl solution and the p-phenylene diamine solution, were studied and optimized. Linearity range of the method was found to be 0. 05-10. 0 mg·L^-1, at room temperature, when the concentration of HCl solution and the p-phenylene diamine solution were 0. 5 mol·L^-1 and 10 g·L^-1, respectively. Detection limit （3S/N） found was 0. 006 3 mg·L^-1. Precision of the method was tested at IO3^- concentration of 1.0 mg ·L^-1 for 11 determinations, giving value of RSD of 1.07%. Based on 2 samples of table salt with known contents of iodate, recovery was tested by standard addition method, values of recovery found were ranged from 99. 8% to 101.6%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2009年第7期836-837,841,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
国家863资助项目(NO:2006AA09Z173)
关键词
流动注射-光度法
碘
对苯二胺
碘酸盐
Flow injection-photometry
Iodate
p-Phenylenediamine
Table salt
