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研究了在表面活性剂溴化十六烷基三甲铵(CTMAB)存在下,铝(Ⅲ)与对氯苯基荧光酮(pClPF)的显色反应和光度性质。在 pH6.0的 HAc-NaAc 缓冲溶液中,铝(Ⅲ)与试剂形成1:2的络合物。络合物在波长563nm 处的表观摩尔吸光系数ε=1.10×10~5。铝(Ⅲ)含量在0～6.0μg/25ml 范围内符合比尔定律。拟定方法法用于铝铁黄铜及石灰石样品中微量铝的测定,结果满意。
The color reaction and photometric properties of aluminum (Ⅲ) with p-chlorophenylfluorone (pClPF) were investigated in the presence of surfactant cetyltrimethylammonium bromide (CTMAB). Aluminum (III) forms a 1: 2 complex with the reagent in HAc-NaAc buffer solution at pH 6.0. The apparent molar absorptivity ε = 1.10 × 10 ~ 5 at 563nm. Beer’s law is obeyed in the range of 0 ~ 6.0μg / 25ml for aluminum (Ⅲ). The proposed method was applied to the determination of trace aluminum in aluminum-iron-brass and limestone samples with satisfactory results.