新型硫醇硫组合电极研制及性能测试

Preparation and Application of Novel Combinational Thiol Sulfur Electrode

把玻璃参比电极、环状的银．硫化银指示电极、以及铂丝屏蔽电极组合形成新型硫醇硫组合电极，研究了在含有0．2mol／L硫离子的醇．水．氨介质中，在表面活性剂存在下，以环状银电极为阳极，恒定微电流电沉积的方式制备硫化银敏感层的条件。由此法制得的新型硫醇硫组合电极在Ag^＋浓度为1．0×10^-1-1．0×10^-5mol／L范围内斜率为59.0±0．5mV／pC，测量下限为2.2×10^-1moL／L，与同类商品电极相比，响应速度快、记忆效应小、重复性好、电位稳定，易于批量生产，具有较强的适应性和应用价值。

A novel highly combinational thiol （mercaptan） sulfur electrode is described. The combinational electrode is consisted of a ring of silver sulfide electrode as ion-selective indicator, a glass electrode as reference, and a platinum electrode as shielding. The film of silver sulfide electrode was prepared with suitable electrolytes solution containing 0. 2 mol/L sulfide. The electrode exhibited near Nernst potential linear response to Ag（ Ⅰ ） in the range of 1.0 ×10^-1-1.0×10^-1mol/L, with a scope of 59.0 ±0.5 mV/pC in pH 8.2 buffur solution at 22℃. The detection limit of this electrode is found to be 2.2 ×10^-6 mol/L. The distinguishing features of this electrode are its fast response, small in size, easy to prepare, sturdy and anti-abrasive. The good agreement between the results obtained by the proposed and by akin conventional ion-selective electrode for the target analyte confirms its excellent performance and usefulness.