摘要
本文研制了以丁基罗丹明B-AuCl_4^-为电活性物质的碳棒涂膜式PVC膜金离子选择电极。电极对AuCl_4^-离子在1×10^(-3)-7.1×10^(-7)mol/L范围内呈能斯特响应,检测限为5.0×10^(-7)mol/L,级差为58mV(20℃)。电极内阻为0.1MΩ,响应时间小于30秒。电极稳定性、重现性良好。该电极结构简单,制作、储存方便,价格低廉,已成功用于矿样中金的测定。
A new Au(Ⅲ) ion-selective electrode prepared by coating a graphite rod with PVC membrane containing butyl rhodamine B-AuCl_4^- is described. This electrode exhibited a Nernstian response to the Au (Ⅲ) ions within the range of 1×10^(-3) to 7.1×10^(-7)mol/L with a slope of 58 mV at 0.5mol/L H^+. The detection limit was 5.0×10^(-7)mol/L. The membrane resistance is 0.1MΩ and response time is less than 30 sec (10^(-3)mol/L). The electrode shows high sensitive selectivity and stability. The simplicity of the electrode structure, the convenience to make and preserve, the low-cost of the electrode are superior to other PVC membrane electrodes. The electrode has been used successfully for the determination of Au (Ⅲ) in rocks and minerals.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1989年第4期328-330,共3页
Chinese Journal of Analytical Chemistry
