摘要
建立了一种介孔泡沫(MCF)修饰碳糊电极(MCF/CPE)高灵敏测定多菌灵的新方法。采用透射电子显微镜(TEM)、扫描电镜(SEM)和X射线衍射技术对所制备的MCF材料进行了表征。用循环伏安法和交流阻抗技术考察了多菌灵在修饰电极的电化学性能,发现与裸碳糊电极(CPE)相比,MCF/CPE对多菌灵有更显著的响应信号。在最佳实验条件下,多菌灵的氧化峰电流与其浓度分别在0. 1～1. 0μmol/L和1. 0～10μmol/L范围内呈良好的线性关系,线性方程为I=16. 95c+1. 106和I=7. 862c+11. 78,相关系数为R=0. 997和R=0. 995,检出限为0. 5 nmol/L。该法用于铁皮石斛中多菌灵的检测回收率为95. 8%～107. 0%。
A mesostructured cellular foam （MCF） modified carbon paste electrode （ MCF/CPE ） was prepared for sensitive determination of carbendazim. The MCF/CPE was characterized by transmission electron microscopy （TEM）, scanning electron microscopy （SEM） and X-ray diffraction. The electrochemical characteristics of MCF/CPE were investigated by using cyclic vohammetry and electrochemical impedance spectroscopy. It was found that, compared with bare carbon paste electrode （CPE）, the MCF/CPE had a significant response signal of carbendazim. Under the optimum experimental conditions, the oxidation peak current was linearly proportional to the concentration of carbendazim in the range of 0. 1 - 1.0 μmoL/L and 1.0 - 10 μmol/L, respectively. The linear equations were I = 16.95c ＋ 1. 106 and I = 7. 862c ＋ 11.78, and the correlation coefficients R = 0. 997 and R = 0. 995, respectively. The detection limit for carbendazim was 0. 5 nmol/L. The method was used to determine carbendazim in dendrobium candidum sample, and the recoveries were in the range from 95.8% to 107.0%.
作者
蒋翠文
牙禹
蔡卓
李焘
闫飞燕
王彦力
谢丽萍
JIANG Cui-wen1 , YA Yu1 , CAI Zhuo2 , LI Tao1 , YAN Fei-yan1 , WANG Yan-li1 , XIE Li-ping 1(1. Institute for Agricultural Product Quality Safety and Testing Technology, Guangxi Academy of Agricultural Sciences, Nanning 530007; 2. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 53000)
出处
《分析试验室》
CAS
CSCD
北大核心
2018年第11期1299-1302,共4页
Chinese Journal of Analysis Laboratory
基金
广西自然科学基金(2015GXSFBA13907)
广西农业科学院科技发展基金(桂农科2017JM57)项目资助
关键词
介孔泡沫
修饰电极
多菌灵
电化学分析
Mesostructured cellular foam
Modified electrode
Carbendazim
Electrochemical analysis
