DBM-偶氮胂催化褪色光度法测定痕量铜  

The determination of trace copper(Ⅱ) by catalytic fading spectrophotometry of DBM-arsenazo

作　　者：陈常兴 刘长增[2] 黄静[2] 徐文军[2] 

机构地区：[1]山东医学高等专科学校,临沂276002 [2]山东临沂师范学院化学系,临沂276005

出　　处：《分析试验室》2009年第9期103-105,共3页Chinese Journal of Analysis Laboratory

摘　　要：以2，2’-联吡啶为活化剂，用Cu（Ⅱ）催化抗坏血酸还原DBM-偶氮胂的褪色反应，考察了影响反应的条件，测定了反应级数、表观速率常数及表观活化能，拟定了反应的最佳条件，建立了测定痕量铜（Ⅱ）的新方法，方法的检出限为2．4×10-g／mL，线性范围为0～6．00ng／mL。方法已用于池塘水中痕量Cu（Ⅱ）的测定。Using 2, 2＇-bipyridyl as an activator, copper（ Ⅱ） catalyzes the reduction reaction of DBM-arsenazo with ascorbic acid. The optimum condition and mechanism were discussed. The order of the reaction and the apparent activation energy and rate constant have been determined. A new catalytic kinetic photometric method for the determination of trace copper was proposed. The detection limit was 2.4 × 10^-9 g/mL. The range of determination was 0 6.00 ng/mL for copper（ Ⅱ ）. The method has been applied to the determination of copper（ Ⅱ ） in pond water with satisfaetory results.

关 键 词：催化光度 DBM-偶氮胂 Cu(Ⅱ) 

分 类 号：O657.3[理学—分析化学]