苯酚及3种苯二酚异构体在多壁碳纳米管修饰玻碳电极上的电化学行为研究及循环伏安法测定水样中总酚含量  被引量:2

Study on the Electrochemical Behaviors of Phenol and Three Isomers of Dihydroxybenzene at the MWCNTs Modified GCE and CV Determination of Total Phenols in Water Samples

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作  者:尚永辉[1] 王黛琳 彭怡婷 潘乐乐 孙晓梅 SHANG Yonghui;WANG Dailin;PENG Yiting;PAN Lele;SUN Xiaomei(School of Chemistry and Chemical Engineering,Xianyang Normal College,Xianyang 712000,China)

机构地区:[1]咸阳师范学院化学与化工学院,咸阳712000

出  处:《理化检验(化学分册)》2018年第9期1020-1024,共5页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基  金:国家自然科学基金项目(21475113);陕西省科技计划项目(2012JQ2013);陕西省软科学研究计划项目(2015KRM164);咸阳师范学院"青蓝人才"项目(XSYQL201507);陕西省大学生创新创业训练计划项目(201828006)

摘  要:移取1.00×10-3 mol·L-1的苯酚、对苯二酚、邻苯二酚和间苯二酚标准溶液各5.00mL,分别置于4支比色管中,各加pH 5.0的柠檬酸-柠檬酸钠缓冲溶液3.00mL,用水定容至10mL,采用多壁碳纳米管修饰的玻碳电极为工作电极,以0.25V·s-1速率扫描获得循环伏安曲线。结果发现:0.225,0.333,0.727V处的氧化峰电流的加和与总酚浓度在0.5~2 000μmol·L-1内呈线性关系,检出限(3S/N)为0.15μmol·L-1。方法用于测定环境水样中总酚含量,加标回收率在95.0%~105%之间,测定值的相对标准偏差(n=6)小于6.0%。Aliquots of 5.00 mL of standard solution of 1.00×10-3 mol·L-1 phenol,hydroquinone,catechol and resorcinol were taken and placed separately in 4 colorimetric tubes.Portions of 3.00 mL of citric acid-sodium citrate buffer solution(pH 5.0)were added to each of the tubes and the volume of the mixture were made up to10 mL with water.Cyclic voltammetry curves of the 4 solutions were taken at a scanning rate of 0.25 V·s-1,using a multi-walled carbon nanotube modified glassy carbon electrode as working electrode.It was shown that linear relationship was kept between the sum of oxidation peak currents,at 0.225,0.333,and 0.727 V,and the concentration of total phenols in the range of 0.5-2 000μmol·L-1,with detection limit(3 S/N)of 0.15μmol·L-1.The method was used to determine total phenols in environmental water samples,and recovery was tested by standard addition method,giving values of recovery in the range of 95.0%-105%,and RSDs(n=6)less than6.0%.

关 键 词:多壁碳纳米管修饰电极 循环伏安法 苯酚 苯二酚异构体 总酚 水样 

分 类 号:O657.1[理学—分析化学]

 

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