偶氮氯膦-mA-铁(Ⅲ)-高碘酸钾体系催化光度法测定微量铁  

Catalytic spectrophotometric determination of trace iron(Ⅲ) with chlorophosphonazo-mA-ironⅡ-KIO_4 system

作　　者：冯尚彩[1] 

机构地区：[1]临沂师范学院化学系,山东临沂276005

出　　处：《冶金分析》2005年第4期49-51,共3页Metallurgical Analysis

基　　金：山东省重点科研项目(2004GG2202070)

摘　　要：基于在硫酸介质中,铁(Ⅲ)能灵敏地催化高碘酸钾氧化偶氮氯膦-mA(CPA-mA)褪色,建立了测定痕量铁(Ⅲ)的新方法,同时研究了该方法的动力学条件.方法检出限为5.72×10-8g/L,10 mL溶液中,铁的线性范围0～0.5μg.方法用于各种水中痕量铁(Ⅲ)的测定,回收率在98%～102%之间,RSD在1.9%～2.6%之间.A new catalytic spectrophotometric method for the determination of trace iron（Ⅲ） has been developed. The method is based on the catalytic effect of iron（Ⅲ） on the oxidation of chlorophosphonazo-mA with KIO4 in the medium of H2SO4.The detection limit of this method is 5.72 × 10^-8g/L for iron（Ⅲ） and Beer＇ s law is obeyed for iron（Ⅲ） in the range of 0 - 0.5 μg/10 mL. RSDs are 1.9 % - 2.6 % and recoveries range from 98 % to 102 %. The method has been applied to the determination of trace iron in the water with satisfactory results.

关 键 词：催化动力学光度法 偶氮氯膦-MA 铁(Ⅲ) 

分 类 号：TG115.33[金属学及工艺—物理冶金]