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本文研究了在表面活性剂存在下,Al与溴代二甲氨基苯基萤光酮(BDMAF)的显色反应,结果表明,在近中性介质中,铝与BDMAF和阳离子表面活性剂CTMAB形成三元配合物,其组成为Al:BDMAF=1:3,而在pH=10~11氨性介质中,Al与BDMAF,磺基水杨酸及非离子表面活性剂形成紫红色的组成为1:4的四元配合物。形成的四元配合物的显色反应可在室温瞬间完成,稳定性增加、灵敏度提高。以铜试剂作为掩蔽剂,由四元配合物直接光度法测定高铝水泥、石英砂、石灰石等试样中微量铝的测定,方法取得了满意的结果。
In this paper, the color reaction of Al with bromodimethylaminophenylfluorone (BDMAF) in the presence of a surfactant was studied. The results show that the formation of aluminum and BDMAF and the cationic surfactant CTMAB in a near neutral medium Ternary complex with a composition of Al: BDMAF = 1: 3, and a composition of purple with BDMAF, sulfosalicylic acid and nonionic surfactant in a pH = 10-11 ammoniacal medium with a composition of 1 : 4 quaternary complex. The formation of the quaternary complex color reaction can be completed at room temperature, stability, increased sensitivity. With copper reagent as masking agent, the determination of trace aluminum in high alumina cement, quartz sand, limestone and other samples by four-component complex direct photometric method has achieved satisfactory results.