溴代二甲氨基苯基萤光酮作为铝的高灵敏度显色剂

A High Sensitive Color Agent of Aluminium Br Omodimnethylamin- phenylfluorone(BDMAF)

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。

This paper studies the color reaction of Al with BDMAF in the presence ofsurfactant,the resultS Show that in the eneutral condion the Al with BDMAF and cationsurfactant(CTMAB)forms tricoordination complex in the proportion of 1:3 of Al :BDMAF,at the ammonical medium of pH=10～11 the Al complexes withBD MAF,sulfo-salicvlic acid and non-ionic-surfactant in the color of purplish-red andthe proportion of 1:4.The later reaction has the advantages of instantaneous completingthe color reaction in room temperature,increaing stability of product,and improving thesensitivity,Thus,the trace Al in the samples of cement containing high amount of Al,quartzsand and limestone can be directly deteimined with the photometric method of the complexusing copper-reagent as a screening agent and sufficient results were obtained。