【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0.5 mol.L-1、对苯二胺浓度为10 g.L-1时,该方法的线性范围为0.05~10.0 mg.L-1,检出限(3S/N)为0.006 3 mg.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%(1.0 mg.L-1碘酸根)。更多还原

【Abstract】 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 IO-3 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%.更多还原