【摘要】 <正> 金离子选择电极已有不少报道,但实际应用中存在灵敏度不高、线性范围窄、级差较小、重现性较差等缺点。本文选用多种阳离子交换剂,特别是金的光度分析中使用的碱性染料,经正交试验对比选择,确定了丁基罗丹明 B-AuCl^-4为电活性物质、氯苯为溶剂、更多还原

【Abstract】 A new PVC membrane gold（Ⅲ）ion-selective electrode based on butyl rhodamine B- AuCl₄^- as electroactive material with various solvent mediators has been prepared and investi- gated.The membranous composition is optimized to be 0.005g butyl rhodamine B-AuCl₄^-,0.1g chlorobenzene,0.25g dioctylphthalate and 0.2g PVC.The electrode exhibits Nernstain res- ponse for AuCl₄^- from 1×10^-3M to 6.31×10^-7M.The limit of detection is 3.16×10^-7M.The response time is about 1 min(10^-5M AuCl₄^-).The slope is 58 mV/pAu.The electrode shows high sensitivity,selectivity and stability and it has been used successfully for the determination of Au in rocks and minerals.更多还原