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在 pH6 6的缓冲溶液中 ,Al -Br PF体系产生一明晰的阴极化极谱波 ,其二次导数波的峰电位为 - 0 88V(vs SCE) ,峰电流与铝浓度在 5 9× 1 0 - 9～ 4 1× 1 0 - 8mol/L范围内呈线性关系。研究了极谱电流的性质 ,认为获得的极谱波为络合物吸附波 ,相应络合物的组成为 [Al(Br PF) ],条件稳定常数 6 3× 1 0 7。并建立了测定微量铝的灵敏分析方法 ,应用于碳酸钠、锌合金和铁矿石样品中铝的测定 ,结果满意。
In pH6 6 buffer solution, the Al-Br PF system produces a clear cathodic polarographic wave with a second derivative wave peak potential of -0.88 V (vs SCE), a peak current and aluminum concentration of 5 9 × 1 0 - 9 ~ 4 1 × 10 ~ 8mol / L within a linear relationship. The polarographic current was studied. The polarographic wave obtained was considered as the complex adduct wave. The composition of the corresponding complex was [Al (Br PF)], and the conditional stability constant was 6 3 × 10 7. A sensitive analytical method for the determination of trace aluminum was established, which was applied to the determination of aluminum in sodium carbonate, zinc alloy and iron ore samples with satisfactory results.