采用溶胶-凝胶法制备了纳米铁酸铋,用作荧光光度法测定大气微颗粒物中邻苯二甲酸酯(PAEs)含量时的Fenton试剂.在水解液中加盐酸(1+1)溶液中和并用0.03 mol·L-1磷酸盐缓冲溶液控制酸度至pH 7,加入铁酸铋0.050 0 g及过氧化氢使其浓度在100 mL总体积中达0.02 mol·L-1,进行光催化Fenton反应3.5 h.根据在417 nm处所测得荧光强度,可对所含PAEs进行定量.邻苯二甲酸二乙酯的浓度在3.8×10-7~4.8×10-5mol·L-1范围内与其荧光强度呈线性关系,检出限(3S/N)为5.43×10-8mol·L-1.加标回收率在90.8%~108%之间,测定值的相对标准偏差(n=7)在2.1%~8.3%之间.

Nano-Bismuth ferrate (BiFeO3) was prepared by the sol-gel method and used as Fenton reagent in the fluorophotometric determination of phthalates (PAEs) in atmospheric microparticles.The hydrolysate was neutralized with HCl (1+1) solution and its acidity was controlled at pH 7 with 0.03 mol·L-1 phosphate buffer solution.Bismuth ferrate (0.050 0 g) and H2O2 were added to render to concentration of H2O2 attained to 0.02 mol·L-1 in a total volume of 100 mL.The solution was irradiated under a high-pressure mercury lamp for 3.5 h to carry out the photocatalytic heterogeneous Fenton′s reaction.Determination of PAE′s was performed by measuring the fluorescence intensity (IF) at 417 nm.Taking diethylphthalate (DEP) as example,linear relationship between values of IF and concentration of DEP was kept in the range of 3.8×10-7-4.8×10-5mol·L-1,with its detection limit (3S/N) of 5.43×10-8mol·L-1.Values of recovery found by standard addition method were in the range of 90.8% to 108%,with values of RSD′s (n=7) ranged from 2.1% to 8.3%.