过氧化氢-钴-纳米银体系共振散射法测定痕量过氧化氢

Resonance light scattering method for determination of hydrogen peroxide by the Co( Ⅱ)-silver nanoparticles system

基于纳米银与Co^(2+)的络合反应及H_2O_2与Co^(2+)的类Fenton反应,建立了一种测定H_2O_2的共振散射方法。在pH=5.2的柠檬酸-磷酸氢二钠缓冲液中,530nm处,H_2O_2浓度在0.02~0.4μmol·L^(-1)范围内与共振散射强度降低值△I呈良好的线性关系,相关系数r为0.9966,检出限为1.07×10^(-8)mol·L^(-1)。该法用于池塘水和雨水中过氧化氢的测定,回收率分别为104.26%和97.63%,同时探讨了反应机理。

A new resonance light scattering method for the determination of hydrogen peroxide was developed,which basedon that Co^2＋was chelated by silver nanoparticles and Co^2＋participated in Fenton-like reaction with hydrogen peroxide.In a buffer solution of pH 5. 2 citric acid-disodium hydrogen phosphate,the resonance light scattering intensityat 530 nm was decreased linearly with concentration ofhydrogen peroxideoverthe range of 0. 02 - 0. 4μmol·L^-1,with a correlation coefficient of 0. 9966 and a detection limit of 1. 07 ×10^-8 mol·L^-1.The method has been applied to the analysis of hydrogen peroxide in pond water and rainwaterwiththe recoveries of 104. 26%and 97. 63%,Simultaneously,the reaction mechanism was discussed.