高锰酸钾-甲醛-碘化学发光新体系的研究

Study on Chemiluminescence Reaction of Potassium Permanganate-Formaldhyde-I^(-)System

在甲醛存在下 ,高锰酸钾在酸性溶液中可以氧化碘离子 ,产生很强的化学发光。根据这一发现 ,采用流动注射技术 ,建立了利用高锰酸钾 -甲醛 -碘化学发光体系测定碘的化学发光分析法。方法的检出限为 1 .8× 1 0 -8g/m L,相对标准偏差为 1 .3% (1 .0× 1 0 -6g/m L ,n=1 1 ) ,线性范围为 1 .0× 1 0 -7～ 8.0× 1 0 -6g/m L。方法已用于食品中碘含量的测定。

Chemiluminesence reaction of I - with potassium permanganate in the presence of formaldehyde as an enhancer was investigated A new method for determination of iodine on the basis of the reaction was developed.The detection limit is 1 8×10 -8 g/mL I -,the relative standard deviation is 1 3% for 1 0×10 -6 g/mL I -,( n =11),the linear range is 1 0×10 -7 ～ 8 0×10 -6 g/mL I -. The method was applied to determination of iodine in food