中文摘要：

基于羧基化多壁碳纳米管（c-MWCNT）修饰玻碳电极,建立了无汞、高灵敏度测定痕量间苯三酚的新方法.利用循环伏安（CV）法、交流阻抗法（AC）对该修饰电极进行了表征;用线性扫描伏安法（LSV）研究了间苯三酚在修饰电极上的电化学行为.实验结果表明,在0.1 mol·L-1的磷酸缓冲液（pH 6.8）中,当间苯三酚在c-MWCNT修饰玻碳电极表面于-1.0 V电位下富集30 s,电位扫速为100 mV.s-1时,该修饰电极在线性扫描伏安图上能出现一灵敏的氧化峰,峰电位约为0.611 V;峰电流与间苯三酚浓度在1.0×10-7—2.0×10-5 mol·L-1范围内呈良好线性关系,其相关系数为0.995,检出限可达1.0×10-8 mol·L-1;该修饰电极稳定性较好,可用于湘江水样中间苯三酚的现场快速检测,回收率在96.0%—102.0%之间.

英文摘要：

A highly-sensitive and mercury-free method of determining trace phloroglucinol was established based on carboxylic carbon nanotube modified glassy carbon electrodes.The modified electrode was characterized by cyclic voltammetry（CV） and alternating current impedance（AC）.The electrochemical behavior of phloroglucinol was investigated by linear sweep voltammetry（LSV）.The experimental results showed that there was an oxidation peak in the voltammogram,and the peak potential was about 0.611 V when accumulation time of phloroglucinol at the modified electrode was 30 s at-1.0 V and the potential scan rate was 100 mV · s-1 in 0.1 mol · L-1 phosphate buffer solution（pH 6.8）.There was a good linear relationship between the peak current and phloroglucinol concentration in the range of 1.0×10-7—2.0×10-5 mol · L-1 with a correlation coefficient of 0.995,and the detection limit was 1.0×10-8 mol · L-1.This modified electrode had high stability and was employed in the rapid determination of phloroglucinol in Xiangjiang River water samples,and the recovery was from 96.0% to 102.0%.