催化光度法测定痕量铁的研究──Fe（Ⅲ）－对乙酰基偶氮胂－H＿2O＿2体系  

Catalytic Kinetic Spectrophotometric De-termination of Trace Iron-System of Fe(Ⅲ)-P-Acetylarsenazo-H_2O_2

作　　者：赵书林[1,2,3] 夏心泉[1,2,3] 高光炎 马厚蓉[1,2,3] 

机构地区：[1]沈阳化工学院高分子化工系铁 [2]对乙酰基偶氮胂 [3]催化动力学光度法

出　　处：《分析试验室》1996年第4期58-60,共3页Chinese Journal of Analysis Laboratory

摘　　要：本文基于在弱酸性介质中及活化剂α，　α－联吡啶存在下，痕量铁（Ⅲ）对过氧化氢氧化对乙酰基偶氮胂的反应有强烈的催化作用，建立了催化光度法测定痕量铁的新方法。该法灵敏度为１；１４×１０￣（－１１）ｇ／ｍＬ，测定范围为０～０．１０μｇ　Ｆｅ￣３＋／２５ｍＬ，表观活化能为８２．２４ＫＪ／ｍｏｌ。应用于大米、小米和小麦中痕量铁的测定，结果满意。new indicator reaction is describedinwhich p-acetylarsenazo is oxidized to discolourby hydrogenperoxide,with iron(Ⅲ)as thecatalyst and α,α'-dipyridyl as the activator.Thus a method for determining trace iron wasset up.The sensitivity is l.14 ×10￣(-11)g/mL,the range of determination is 0～0.10μg Fe￣(3+)/25mL. The apparent activation energy of thecatalytic reaction has been found to be 82. 24KJ/mol.The metho has been applied to the determination of trace ifon in rice,millet andwheat with satisfactory results

关 键 词：铁 乙酰基偶氮胂 催化光度法 过氧化氢 

分 类 号：O614.811[理学—无机化学] O657.32[理学—化学]