摘要
在HCl、KCl介质中,W(Ⅵ)-水杨基荧光酮络合物有一灵敏的催化波,峰电位为-1.22V(υs.SCE),W(Ⅵ)浓度在4.4×10^(-11)—4.4 ×10^(-8)mol/L范围内与峰电流呈线性关系,检测限2.2×10^(-11)mol/L。实验表明该波为氢催化波,可用于痕量或超痕量W的测定。
A new catalytic polarographic system of tungsten has been suggested. Experiments showed that the tungsten-salicylfluorone (SAF) complex has a sensitive hydrogen catalytic wave in HC1-KC1 supporting electrolyte. In 0.028 mol/1 HC1, 0.012 mol/L KC1, and 0.0006% SAF, the peak potential of the wave is -1.22V (vs. SCE). A linear relationship between peak current and W(Ⅵ) concentration holds in the range 4.4 × 10-11-4.4 ×10-8mol/L. The limit of detection for tungsten is 2.2 × 10-11mol/L. The method is advantageous owing to its high sensitivity and selectivity, and has been successfully applied to the determination of trace amounts of W in minerals and ores.
出处
《岩矿测试》
CAS
CSCD
北大核心
1991年第3期185-188,共4页
Rock and Mineral Analysis
关键词
钨
水杨基荧光酮
极谱催化波
tungsten determination, salicylfluorone, catalytic polarographic wave.
