【摘要】 在0.012mol/L HAc-0.10mol/L NaAc缓冲溶液中pH5.60,铬蓝黑R于-0.34V（vs.SCE）处有一极谱波P₁,加入Ga（Ⅲ）,在-0.55V（vs.SCE）处产生一灵敏的极谱波P₂。i_p2与Ga（Ⅲ）浓度在0.20～15.0μg/25ml范围内呈线性关系。试验表明,该极谱波属络合吸附波。本法用于测定铝箔、铅锌矿中微量镓,结果满意。更多还原

【Abstract】 In the buffer solution of 0. 012 mol/L acetic acid-0. 1 mol/L sodium acetate (pH 5. 60) , the reductive wave of eriochrome blue black R (EBBR) (PI) was observed at-0. 34 V(vs. SCE) and in the presence of gallium (Ⅲ) a new sensitive polarographic wave of Ga (Ⅱ)-EBBR complex (p2) yielded at -0. 55 V (vs. SCE). The peak height of p2 was directly proportional to the concentration of Ga(Ⅱ) in the range of 0. 2 to 15. 0 μg/25ml. The standard regression equation is y = 0. 1854+2. 8876x. and the relative coefficient is 0. 9990. The detection limit was 4 ng/ml. The mechanism of electrode reaction was studied by various methods. The wave(p2) was confirmed to be an adsorptive complex wave. The proposed method has been used for the determination of trace gallium in ores and metallic materials after prior separation by solvent extraction with satisfactory results.更多还原