摘要
实验发现,在25℃高氯酸介质中Ir(Ⅳ)—Ce(Ⅳ)—As(Ⅲ)催化体系中As(Ⅲ)浓度的变化可用单扫描示波极谱跟踪测量。作者采用起始速率法研究了该指示反应测定铱的各种影响因素,拟定一个测定超痕量铱的催化反应—示波极谱分析新方法。其检出限和测定范围分别为0.02ng/ml和0.04～4.0ng/ml Ir。
It was found that the depletion of As (Ⅲ) concentration in the catalytic reaction system of Ce (Ⅳ) —As (Ⅲ) —Ir (Ⅳ) —HClO_4 can be monitored by single-sweep oscillopolarography. A new and highly sensitive catalytic method with oscillopolarographic detection has been developed by the initial rate procedure, A detection limit of 0.02ng/ml Ir was achieved. The activation energy for the cata lytic reaction was 40.21 kJ·mol^(-1). The mechanism was also discussed.
出处
《贵金属》
CAS
CSCD
北大核心
1992年第4期42-47,共6页
Precious Metals
关键词
铱
痕量分析
示波极谱法
Iridium
Trace analysis
Oscilloscopic polarography
