分析测试学报2009，Vol.28Issue(7)：819-823,828,6.DOI:10.3969/j.issn.1004-4957.2009.07.013
磷钨酸改性蒙脱土修饰电极对多巴胺与尿酸的测定
Determination of Dopamine and Uric Acid on Phosphotungstic Acid Clay-modified Electrode with Surfactant
摘要
Abstract
A novel phosphotungstic acid(PTA) clay-modified glassy carbon electrode(PTA-MMT/GCE) was prepared and successfully used to determine dopamine(DA) and uric acid(UA).The characterization of electrochemical response of DA and UA on PTA-MMT/GCE was investigated.The results indicated that in pH 6.5 PBS buffer,a pair of redox peaks of DA was observed on the modified electrode and the DA was controlled by diffusion and reversible process.An obvious oxidation peak of UA appeared at 0.328 V on the modified electrode.The electrode process of UA was inreversible and controlled by diffusion too.Reaction electronic numbers and diffusion coefficients of DA and UA were calculated with the method.The properties of electrode surface were studied by comparing the Nyquist plots of PTA-MMT/GCE and NaMM/GCE.The effects of buffer solution,pH,modifier dosage,scan rate and temperature were discussed by cyclic voltammetry.Under the optimal conditions,the oxidation peak of DA and UA was completely separated.The peak current intensities were linear over the dopamine hydrochloride injection and UA in uric sample with satisfactory results.The spiked recoveries of the two samples were 94%-102% and 93%-97%,respectively.关键词
磷钨酸/蒙脱土(MMT)/修饰电极/多巴胺/尿酸Key words
phosphotungstic acid/montmoriuonit(MMT)/modified electrode/dopamine(DA)/uric acid(UA)分类
化学化工引用本文复制引用
何晓英,蒋晓丽,李容,张艳..磷钨酸改性蒙脱土修饰电极对多巴胺与尿酸的测定[J].分析测试学报,2009,28(7):819-823,828,6.基金项目
四川省教育厅资助项目(08zc007) （08zc007）
