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
出处
《分析试验室》
CAS
CSCD
北大核心
1996年第4期58-60,共3页
Chinese Journal of Analysis Laboratory
