DBS-偶氮胂与钍(Ⅳ)显色反应研究

Studies on the Color Reaction of DBS-Arsenazo and Thorium(Ⅳ)

钍(Ⅳ)与DBS-偶氮胂在硫酸介质中反应生成组成比为1:2络合物,由此建立了一个测定钍的新体系。本方法测定钍(Ⅳ)的线性范围为0～2 g·mL 1,在628 nm处方法表观摩尔吸光系数为=1.02×105 L·mol 1.cm 1,检出限为7.6 ng·mL-1。本法用于海带和紫菜样品中钍含量的测定,相对标准偏差分别为4.07%、4.74%,回收率分别为101.3%、101.0%。

It is found that in sulfuric acid,medium thorium（Ⅳ） and DBS-ASA react to generate the composition ratio 1：2 complex.Based on this phenomenon,a new system was developed for the determination of thorium.In this method,the linear calibration was 02 %egmL for the determination of thorium.the apparent molar absorptivity is %^ = 1.02？05 Lmolcm.and the detection limit is 7.6 ngmL,respectively and 628nmThe method was applied to determine the content of thorium in the kelp and laver samples.Their relative standard deviations are 4.07% and 4.74%,respectively.Their recoveries are 101.3% and 101.0%,respectively.