钴铁氧体纳米粒子催化H_2O_2氧化对甲苯酚荧光法测定H_2O_2

Determination of Hydrogen Peroxide in Aqueous Solution Based on CoFe_2O_4 Nanoparticle Catalyzed Fluorescence from H_2O_2 Oxidation on p-Cresol

研究发现钴铁氧体纳米粒子可催化H_2O_2氧化对甲苯酚产生荧光物质2,2＇-二羟基-4,4＇-二甲基联苯,据此建立了测定H2O2的方法.在优化条件下,荧光强度与H_2O_2浓度在1×10-9～1×10-6 mol/L范围内呈现良好的线性关系,H_2O_2的检出限为4.9×10-10 mol/L,对浓度为1×10-7 mol/L和1×10-6 mol/L的H_2O_2平行测定11次,其相对标准偏差（RSD）分别为3.5%和2.1%.该方法已成功用于测定雨水、自来水和江水等水样中的H2O2.

A new analytical method was developed for the detection of hydrogen peroxide, which is based on H202 oxidation on p-cresol in the presence of CoFe204 as catalyst to produce fluorescent 2, 2-di- hydroxy-4,4-dimethyl-biphenyl compound. Various factors affecting the fluorescence intensity have been optimized. Under the optimized conditions, a calibration graph was obtained for H2 02 in the range of 1× 10-9 to 1 × 10-6 mol/L with detection limit of 4.9 × 10-10 mol/L. The relative standard deviation is 3.6% and 2.1% for 1×10-7 and 1× 10 6 mol/L H2O2 （n = 11）, respectively. This method has been applied to determine the H2 O2 in tap water, river water and rainwater successfully.