纳米金催化甲酸还原磷钼酸耦合电置换反应-共振瑞利散射测定痕量汞  

A New Strategy for the Determination of Trace Mercury by Resonance Rayleigh Scattering Method Based on Nano-gold Catalytic Amplification and Galvanic Replacement Reaction-phosphomolybdic Acid

作　　者：刘奇文 李丹[1,2] 黄小芳[1,2] 梁爱惠[1,2] 蒋治良 LIU Qiwen;LI Dan;HUANG Xiaofang;LIANG Aihui;JIANG Zhiliang(Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Guangxi Normal University),Ministry of Education,Guilin Guangxi 541006,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology(Guangxi Normal University),Guilin Guangxi 541006,China)

机构地区：[1]珍稀濒危动植物生态与环境保护教育部重点实验室(广西师范大学),广西桂林541006 [2]广西环境污染控制理论与技术重点实验室(广西师范大学),广西桂林541006

出　　处：《广西师范大学学报（自然科学版）》2022年第2期140-148,共9页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金(21767004)。

摘　　要：在pH=3.1的HCOOH-HCOONa缓冲液中,磷钼酸粒子在450 nm处产生一个共振瑞利散射(RRS)峰。金纳米粒子(AuNPs)可催化磷钼酸-甲酸反应生成磷钼蓝,使得450 nm处磷钼酸的RRS强度线性降低。Hg^(2+)可与AuNPs发生电置换反应,从而抑制AuNPs的催化作用,RRS峰增强。在2.5×10^(-4)~3.5μmol/L,随着Hg^(2+)浓度的增加,AuNPs的催化作用逐渐减弱,反应液的颜色逐渐从蓝色变为无色,体系在450 nm处的RRS峰值(ΔI)线性增高,其线性方程为ΔI=0.32 C+46.1,检出限为0.18 nmol/L。该法用于废水中Hg^(2+)的检测,结果令人满意。Phosphomolybdic acid particles have a resonance Rayleigh scattering(RRS)effect,which produces a RRS peak at 450 nm.In the HCOOH-HCOONa buffer solution at pH=3.1,gold nanoparticles(AuNPs)can catalyze the reaction of phosphomolybdic acid-formic acid to produce phosphomolybdenum blue,making the RRS intensity of phosphomolybdic acid linearly decrease at 450 nm.Hg^(2+) can undergo a galvanic replacement reaction with AuNPs,thereby inhibiting the catalytic effect of AuNPs.In the range of 2.5×10^(-4)-3.5μmol/L,as the concentration of Hg^(2+) increases,the catalytic effect of AuNPs gradually weakens,the color of the reaction solution gradually changed from blue to colorless,and the resonance Rayleigh scattering peak of the system at 450 nm increases linearly.The regression equation isΔI=0.32 C+46.1,and the detection limit is 0.18 nmol/L.This method is used for the detection of Hg^(2+) in wastewater,and the results are satisfactory.

关 键 词：汞 纳米金催化 静电取代 磷钼蓝 共振瑞利散射 

分 类 号：O657.3[理学—分析化学]