聚丙烯酰胺增敏催化过氧化氢氧化维多利亚蓝褪色光度法测量痕量铬Ⅲ  

Catalytic Spectrophotometry for the Determination of Trace ChromiumⅢ Based on Oxidizing Decoloration Reaction of Victoria Blue and Hydrogen Peroxide Using Polyacrylamine as Sensitizer

作　　者：刘佳铭[1] 杨天隆[1] 叶妙玲[1] 朱国辉[2] 李志明[2] 陈翠莲[2] 

机构地区：[1]漳州师范学院化学系,漳州363000 [2]漳州职业技术学院食品生物系,漳州363000

出　　处：《分析化学》2004年第8期1064-1066,共3页Chinese Journal of Analytical Chemistry

基　　金：福建省自然科学基金资助项目 (No .C0 110 0 2 8)

摘　　要：在聚丙烯酰胺存在下 ,基于Cr 对过氧化氢氧化维多利亚蓝褪色有显著的催化作用及聚丙烯酰胺有较强的增敏效应 ,从而建立了聚丙烯酰胺增敏催化过氧化氢氧化维多利亚蓝褪色光度测量痕量Cr 的方法。该褪色反应的速率常数为K =4 .5 1× 1 0 -4s-1 ;表观反应活化能为E =1 31 .99kJ/mol。在最佳条件下 ,Cr 含量在 4 0～ 2 4 0 μg/L范围内符合比耳定律 ,线性回归方程为ΔA =0 .1 0 4 9+0 .0 0 1 1 30CCr (μg/L) ,r =0 9989;检出限为 2 .0 μg/L ,本方法已成功用于水样中CrA new catalytic spectrophotometic method of the determination of trace chromium*# was studied based on the catalytic effect of chromium*# on oxidizing decoloration rection of Victoria blue and hydrogen peroxide and on the sensitive effect of polyacrylamine (PAM).This catalytic decoloration is a first order reaction and its rate constant K is 4.51×10 -4 s -1 ,activation energy E is 131.99 kJ/mol. Beer′s law is obeyed in the range of 40.0 to 240 μg/L( r =0.9989),the detection limit is 2.0 μg/L. The method has been applied to the determination of trace Cr*# in water samples with satisfactory results.

关 键 词：聚丙烯酰胺 增敏 催化褪色光度法 过氧化氢 维多利亚蓝 含量测定 痕量分析 铬 

分 类 号：O657.3[理学—分析化学]