摘要
建立纳米氧化锌修饰玻碳电极-电化学法测定水中的对苯二酚与邻苯二酚的方法。通过探究酚类物质在纳米氧化锌修饰玻碳电极上的电化学行为,发现对苯二酚、邻苯二酚在修饰电极上的差分脉冲电化学信号强度分别是裸电极上的188倍和180倍,进一步研究表明对苯二酚和邻苯二酚在修饰电极上的反应过程均为受吸附控制的单电子、单质子反应过程。在pH 1.89的B-R缓冲溶液中,对苯二酚、邻苯二酚浓度c(mmol/L)在0.001~0.5 mmol/L范围内与其峰电流i(μA)线性相关,线性方程分别为i=0.9219c+2.0573(r=0.9981,对苯二酚)和i=0.5401c+2.3706(r=0.9956,邻苯二酚)。方法检出限均为3.3×10^(-4) mmol/L,该方法应用于模拟水样中对苯二酚和邻苯二酚的测定,对苯二酚回收率为96.8%~103.0%,邻苯二酚回收率为96.4%~104.3%,6次平行测定结果的相对标准偏差对苯二酚不大于4.8%,邻苯二酚不大于5.6%。
A method for determination of hydroquinone and catechol in water by electrochemical method with nano zinc oxide modified glassy carbon electrode was established.By exploring the electrochemical behavior of phenols on nano ZnO modified glassy carbon electrode,it was found that the DPV(Differential pulse electrochemical)signals strength of hydroquinone and catechol on the modified electrode were 188 times and 180 times than those on the bare electrode,respectively.Further research results showed that the reaction process of hydroquinone and catechol on the modified electrode was the reaction process of single electron and single proton controlled by adsorption.In B-R buffer solution with pH 1.89,the peak current(i,μA)was linear with the concentration of hydroquinone and catechol in the range of 0.001-0.5 mmol/L,the linear equations were i=0.9219c+2.0573(r=0.9981,for hydroquinone)and i=0.5401c+2.3706(r=0.9956,for catechol),respectively.The detection limit of the method was 3.3×10^(-4) mmol/L.The method was applied to the determination of hydroquinone and catechol in simulated water samples,the recoveries of hydroquinone and catechol were 96.8%-103.0%and 96.4%-104.3%,respectively.The relative standard deviations of determination results(n=6)were less than 4.8%for hydroquinone and 5.6%for catechol.
作者
尚永辉
刘鑫雨
李子媛
谢华萍
乔姣姣
张世叶
张一驰
张恒
Shang Yonghui;Liu Xinyu;Li Ziyuan;Xie Huaping;Qiao Jiaojiao;Zhang Shiye;Zhang Yichi;Zhang Heng(School of Chemistry&Chemical Engineering,Xianyang Normal University,Xianyang 712000,China)
出处
《化学分析计量》
CAS
2021年第6期16-20,共5页
Chemical Analysis And Meterage
基金
国家自然科学基金项目(21475113)
咸阳师范学院“拔尖人才”资助(XSYBJ201902)
咸阳师范学院专项科研基金重点项目(XSYK19046)
咸阳师范学院省级大学生创新创业训练计划项目(S202010722035)
咸阳师范学院校级大学生创新创业训练计划项目(DC2020035)。
关键词
纳米氧化锌
修饰电极
电化学行为
对苯二酚
邻苯二酚
nanometer ZnO
modified electrode
electroanalytical chemistry
hydroquinone
catechol
