过氧化氢氧化甲基紫催化动力学光度法测定土壤和大米中痕量镉  

Catalytic Kinetic Spectrophotometric Determination of Trace Cadmium in Soils and Rice Samples with Oxidation of Methyl Violet by Hydrogen Peroxide

作　　者：董洪霞 柏婷婷 李子璐 龚宽 程远清 DONG Hongxia,BAI Tingting,LI Zilu,GONG Kuan,CHENG Yuanqing(School of Chemistry and Environmental Sciences,Shangrao Normal University, Shangrao Jiangxi 341000, China)

机构地区：[1]上饶师范学院化学与环境科学学院,江西上饶334001

出　　处：《上饶师范学院学报》2018年第3期56-62,共7页Journal of Shangrao Normal University

基　　金：上饶师范学院创新训练计划项目(2017-CX-80)

摘　　要：在1.0mol/L硫酸介质中,基于痕量镉催化过氧化氢氧化甲基紫发生褪色反应的原理,建立了测定痕量镉的催化分光光度检测方法,探索了影响催化反应检测方法的动力学条件。Cd^(2+)浓度在4.0×10^(-5)~3.2×10^(-4)μg/mL范围内,线性回归方程为y=0.166x+0.043 2,相关系数R^2为0.999 5,土壤及大米中Cd^(2+)的添加回收率分别为94.1%~97.2%、92.3%~94.0%。方法的精密度为3.38%~4.02%。该法能用于土壤及大米实际样本中痕量镉的检测。In the 1.0 mol/L sulfuric acid,based on the principle of cadmium catalytic fading reaction with methyl violet by hydrogen peroxide,the catalytic spectrophotometry for determination of trace cadmium was established by exploration of the catalytic dynamicreaction conditions.The linearity of this method of Cd^2＋concentrations were in ranging of4.0×10^–5-3.2×10^–4μg/mL was conducted with regression equation of y=0.166 x＋0.043 2,correlation coefficient R-2 of 0.999 5.The recovery of this method in soil and rice were of 94.1%-97.2% and 92.3%-94.0% respectively.The precission of this method was conducted as of 3.38%-4.02%.This method can be applied to the trace cadmium determination in rice and soils samples in practic.

关 键 词：过氧化氢 甲基紫 催化动力学分光光度法 痕量镉 

分 类 号：O657.3[理学—分析化学]