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本文提出了锑的一个极谱催化波的新体系。在H_2SO_4-NH_4Ac介质中,有微量硒(Ⅳ)存在时,锑(Ⅲ)-草酸铵络合物产生一个灵敏的吸附催化波。峰电位在-0.30伏左右(vs.SCE)。锑浓度在8.2×10~(-0)—2.5×10~(-0)M之间与波高成直线关系。文中拟定的方法适用于矿石及化探样品中痕量锑的测定。此外,还初步探讨了催化波的机理。
This paper presents a new system of antipolarization polarographic catalysis. The antimony (Ⅲ) -oxalate complex formed a sensitive adsorption catalytic wave in the presence of trace amount of selenium (Ⅳ) in H_2SO_4-NH_4Ac medium. The peak potential is around -0.30 volts (vs.SCE). The concentration of antimony has a linear relation with the wave height between 8.2 × 10 ~ (-0) -2.5 × 10 ~ (-0) M. The proposed method is suitable for the determination of trace antimony in ores and geochemical samples. In addition, the mechanism of catalytic wave is also discussed preliminarily.