摘要
采用热电子诱导阴极电致化学发光技术,建立了小麦粉中过氧化苯甲酰(BPO)的高灵敏度检测方法.以氧化处理的玻碳电极(CxO1-x)为工作电极,在电极上施加-18 kV(vs.Ag/AgCl)阴极脉冲电位,电子通过遂穿机制无能量损失地穿越能垒,形成热电子,而后经水合热能化作用,形成水合电子,溶液中的BPO在强还原性的水合电子作用下,生成了强氧化性自由基,生成的自由基参与了鲁米诺(Luminol)的氧化还原反应,而激发Luminol发光,从而最终实现BPO的痕量检测.线性范围为:10-1000μg/L;检出限(S/N=3)为0.7μg/L.本方法用于小麦粉中BPO分析,回收率达97.2%-100.4%,结果令人满意.
A sensitive method base on hot electron-induced cathodic electrochemiluminescence has been developed for the trace determination of benzoyl peroxide(BPO). Under the cathodic pulse potential of -18.0 V(vs. Ag/Ag Cl), after tunneling through the CxO1-x film, the hot electrons underwent a fast hydration reaction in the conduction band of water, and forming hydrated electrons partially. The hydrated electrons reacted with BPO, and the strong oxidants C6H5–COO^* - were formed. Ultimately, the cathodic ECL results from the luminol oxidized by the strong oxidants. Under the optimum conditions, the excellent linearity was observed in the range from 10–1000 μg/L. The limit of detection(S/N=3) was 0.7 μg/L. The proposed method has been applied to the analysis of BPO in flour with satisfactory results.
出处
《中国科学:化学》
CAS
CSCD
北大核心
2016年第3期280-286,共7页
SCIENTIA SINICA Chimica
基金
国家自然科学基金(编号:20975022
21475023
21275030)
"十二五"国家科技支撑计划项目(编号:2012BAD29B06)资助项目