基于银纳米增强的化学发光法检测对苯二酚

在碱性条件下,银纳米(Ag NPs)对luminol-K3Fe(CN)6化学发光体系具有显著的增强作用.研究发现,对苯二酚(HQ)对luminol-K3Fe(CN)6-Ag NPs化学发光体系具有抑制作用.结合流动注射技术提出了luminol-K3Fe(CN)6-Ag NPs化学发光(FI-CL)灵敏检测HQ的新方法.结果表明,HQ的线性范围为1.0×10-10~1.0×10-7mol·L-1,检出限为3.0×10-11mol·L-1,对5.0×10-9mol·L-1的HQ溶液平行测定11次的RSD为1.4%.将提出的方法分别用于河水和自来水中HQ含量的测定,加标回收率分别为98.0%~100.8%和99.1%~100.4%.结合化学发光光谱,对银纳米增强luminol-K3Fe(CN)6化学发光体系以及HQ对该体系的抑制作用机理进行了探讨.

Sensitive Detection of Hydroquinone with Silver Nanoparticles-enhanced Chemiluminescence

Silver nanoparticles( Ag NPs) exhibited better chemiluminescence( CL) catalysis activity in luminolK3Fe( CN)6system under alkaline condition. It was found that the CL intensity of luminol-K3Fe( CN)6-Ag NPs was strongly inhibited in the presence of hydroquinone( HQ). Based on the luminol-K3Fe( CN)6-Ag NPs CL system,a sensitive method to detect HQ by flow injection( FI) coupled with chemiluminescence( CL) detection was described.Under the optimized conditions,the sensitive detection of HQ could be realized and the detection limit of HQ was calculated to be 3. 0 × 10- 11 mol / L with a linear range of 1. 0 × 10- 10~ 1. 0 × 10- 7mol / L. The relative standard deviation of 1. 4% for 11 replicate determinations of 5. 0 × 10- 9mol / L was obtained. The method was applied to the HQ analysis of river water and tap water samples with recoveries of 98. 0 % ~ 100. 8% and 99. 1% ~ 100. 4%,respectively. The possible mechanism of Ag NPs enhancing effect on the weak CL emission of K3Fe( CN)6system and the inhibition effect of HQ on the system was discussed by fluorescence spectrophotometer.