铁-溴酸钾-偶氮氯膦-mA体系催化动力学光度法测定痕量铁  

Catalytic kinetic spectrophotometric determination of trace ironⅢ with iron-potassium bromate-chlorophosphonazo-mA system

作　　者：韩长秀[1] 冯尚彩[1] 

机构地区：[1]临沂师范学院化学与环境科学系,山东临沂276005

出　　处：《冶金分析》2005年第5期63-65,共3页Metallurgical Analysis

摘　　要：在硫酸介质中,铁能催化溴酸钾氧化偶氮氯膦-mA(CPA-mA)发生褪色反应,据此建立了测定痕量铁的新方法,同时研究了该方法的动力学条件.方法检出限为1.27×10-9g/mL,10 mL溶液中测定铁的线性范围为0.01～1.0μg,回收率在98%～103%之间,RSD在1.9%～2.4%范围内,用于水及人发中痕量铁的测定,结果满意.A new catalytic kinetic spectrophotometric method for the determination of trace iron（Ⅲ）was developed. It was based on the catalytic effect of iron（Ⅲ）on the fading reaction of chlorophosphonazo-mA oxidized by potassium bromate in sulphuric acid medium. The detection limit of this method was 1.27×10^-9g/mL for iron（Ⅲ） and Beer＇s law was obeyed in the range of 0.01 - 1.0 μg/10 mL. The RSD and recovery were 1.9 % - 2.4 % and 98 % - 103 %, respectively. The method has been used for determining ironall）in water and hair samples with satisfactory results.

关 键 词：偶氮氯膦-MA 催化光度法 铁 水 头发 

分 类 号：O614.811[理学—无机化学] O657.3[理学—化学]