双波长双指示剂催化动力学光度法测定痕量铁  

Determination of trace iron by dual-wavelength dual-indicator catalytic kinetic spectrophotometric method

作　　者：葛笑兰[1] 谢秀娟[1] 张振新[1] 

机构地区：[1]淮北煤炭师范学院化学系,安徽淮北235000

出　　处：《化学研究与应用》2010年第2期191-193,共3页Chemical Research and Application

基　　金：安徽省教育厅自然科学基金项目(2006KJ163C)

摘　　要：A new catalytic spectrophotometric method for the determination of trace iron was established in this paper.The method was based on the fading indication reaction between alizarin red and rhodamine B using hydrogen peroxide as oxidant in sulphuric acid medium.It used iron as catalyst.The maximum absorption peak was at 430nm and 560nm,the linear range of the determination was 0.02～0.2 μg /mL and 0.2～0.32 μg/mL,the detection limit for iron was 5.04×10-11 g/mL.The method has high sensitivity,good selectivity and stability.The operation of the system is simple and its reagents is easy to get.The method has been applied to determination of trace iron(Ⅲ)in tea sample with satisfactory results.A new catalytic spectrophotometric method for the determination of trace iron was established in this paper. The method was based on the fading indication reaction between alizarin red and rhodamine B using hydrogen peroxide as oxidant in sulphuric acid medium. It used iron as catalyst. The maximum absorption peak was at 430nm and 560nm, the linear range of the determination was 0.02 -0.2 μg/mL and 0.2 - 0.32 μg/mL, the detection limit for iron was 5.04 - 10^-11g/mL. The method has high sensitivity, good selectivity aod stability. The operation of the system is simple and its reagents is easy to get. The method has been applied to determination of trace iron（ Ⅲ ）in tea sample with satisfactory results.

关 键 词：铁 催化光度法 茜素红 罗丹明B 

分 类 号：O657.32[理学—分析化学]