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在阳离子表面活性剂 CTMAB存在下 ,验证 Al3+与 3,5二溴 4偶氮变色酸苯基荧光酮 (DBACPF)的显色反应条件和光度性质。在 p H为 6 .0的 HAc Na Ac缓冲介质中 ,Al3+与试剂形成 1∶ 2的红色配合物 ,最大吸收峰位于 5 6 0 nm处 ,表观摩尔吸光系数为 1.2 5× 10 5L/ (m ol· cm) ,Al3+的质量浓度为 0～ 2 0 μg/ m l时符合比尔定律。用于磷矿石中三氧化二铝含量的测定 ,结果与标准值相符。
The color reaction conditions and photometric properties of Al3 + with 3,5-dibromo-4-azo chromogenic acid phenylfluorone (DBACPF) were verified in the presence of cationic surfactant CTMAB. In the HAc Na Ac buffer medium with p H of 6.0, the red complex of Al 3 + with the reagent formed 1: 2 with the maximum absorption peak at 5600 nm with an apparent molar absorptivity of 1.2 5 × 10 5 L / ( Beer’s law was obeyed when the mass concentration of Al3 + was 0 ~ 20 μg / ml. Used for the determination of aluminum oxide content in phosphate rock, the result is consistent with the standard value.