纳米Pt修饰Pt电极检测芥子气的研究

Nano-Pt modified Pt-electrodes for the detection of HD

采用纳米Pt修饰Pt电极、在0.8mol/L H2SO4-50%CH3CN电解质体系中,同时检测出芥子气分子中的特征基团-S-和-Cl,使HD的检测结果具有特征性。采用方波伏安法,能够更有效分辨芥子气分子中-Cl的电化学信号,芥子气的检测限为0.1μg/mL。在研究检测芥子气的机理中发现,芥子气分子中的-S-基团在电化学氧化过程中,在工作电极上失去的电子,经外电路传递到对电极,电解质溶液中的溶解氧在对电极表面发生O2+4H++4e→2H2O的电化学还原反应,使得工作电极的输出电子被消耗,电化学闭合回路的电流得以有效流通,电解质溶液中的溶解氧对-S-的氧化过程有至关重要的作用,外在表现为芥子气的检测灵敏度有显著提高。

In this paper, -S- and C1 groups of HD were detected simultaneously with nano-Pt modified Pt-elec- trode in 0.8 mol/L H2SO4-50%CH3CN electrolyte, to achieve the characteristic detection of HD. The reduction signal of CI in HD was efficiently distinguished by Square Wave Voltametry. The detection limit of HD was 0.1μg/mL. It was found that soluble oxygen in electrolyte had important effect in the electrochemical reaction. Electron produced at the working electrode by -S- group oxidation of HD migrated through external circuit to the counter electrode where oxygen oxidation occurred, 02 ＋ 4H＋ ＋ 4e → 2H20, electron consumed, then the current flew more efficiently. As a result, the soluble oxygen in electrolyte have an important role in detection sensitivity.