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用极谱法测定镓,,其检测下限大多在10ppb以上,镓—对二甲氨基苯基萤光酮络合物吸附催化波的灵敏度较高,检测下限为2ppb。但镓络合物的阴极伏安法测定未见报导。本文根据镓—苯基萤光酮络合物在汞电极上具有吸附特性,探讨了阴极伏安法测定痕量镓的可能性,发现在KCl—HCl—乙醇—聚乙烯醇底液中,镓—苯基萤光酮络合物在-0.87V(vs S·C·E·,以下同)有一个清晰、灵敏、稳定而尖锐的吸附还原峰,经富集2分钟后,检测下限为0.2ppb,测定线性范围为0.2～150ppb,灵
Polarographic determination of gallium, the detection limit mostly at 10ppb above, gallium - p-dimethylaminophenylfluorone complex adsorption catalytic wave sensitivity, the detection limit of 2ppb. However, the voltammetric determination of gallium complexes has not been reported. In this paper, based on the adsorption characteristics of gallium-phenyl-fluorone complex on mercury electrode, the possibility of cathodic voltammetry for the determination of trace gallium was investigated. It was found that in the KCl-HCl-ethanol- - phenylfluorone complex has a clear, sensitive, stable and sharp adsorption reduction peak at -0.87V (vsS · C · E ·, the same below). After 2 minutes enrichment, the detection limit is 0.2 ppb, measured linear range of 0.2 ~ 150ppb, spirit