光化学催化动力学法测定痕量铊  

Determination of Trace Amount of Thallium(Ⅰ) by Photochemical Catalytic Kinetics

作　　者：吴晓静[1] 王旭东[1] 舒丽平[1] 郭启昌[1] 

机构地区：[1]合肥工业大学化工学院,合肥230009

出　　处：《理化检验（化学分册）》2010年第3期224-226,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：基于在紫外光的照射下铊对光泽精-过氧化氢体系的光化学催化作用,提出了光化学催化动力学测定痕量铊的方法。系统地考察光源、光照时间、试剂用量及共存离子等因素对测定结果的影响,并探讨了该体系光化学催化作用可能的机理,确定了最佳的测定条件。铊(Ⅰ)的线性范围为0.05～0.3mg·mL-1,检出限(3s/k)为0.0081mg·mL-1。该法用于硫铁矿样品中痕量铊的测定,其相对标准偏差(n=6)为3.27%,回收率在80.0%～120.0%之间。Based on photochemical catalysis of thallium（ I ） on the reaction of lucigenin-hydrogen peroxide system under UV radiation, a method of photochemical catalytic kinetic determination of trace amount of thallium（ I ） was proposed. Influential factors, including the light sources, radiation time, amount of reagent, and coexisting ions were systemically studied; and the mechanism of photochemical catalytic action of this system was discussed. Under the optimum conditions, linearity range of thallium （ I ） was found between 0. 05-0. 3 mg·L-1 with detection limit （3s/k） of 0. 008 1 mg·L-1. The proposed method was used in the determination of trace amount of thallium （ I ） in mineral sample, giving values of RSD （n=6） of 3. 27% and recovery in the range of 80. 0%-120. 05 respectively.

关 键 词：光化学反应 催化动力学 铊 光泽精 

分 类 号：O644.1[理学—物理化学]