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在阳离子表面活性剂存在下,Al(Ⅲ)与邻苯二酚紫(PV)的成络反应研究已有报导。我们研究了在溴化十六烷基吡啶(CPB)存在下,Al(Ⅲ)与溴邻苯三酚红(BPR)的成络反应,发现在BPR存在下,生成高络合比的Al—BPR—CPB(1:4:3)胶束络合物(无CPB则生成1:2二元络台物),其λ_(max)=630nm,较二元络合物红移40nm,对比度△入从50nm增加到70nm,灵敏度从9.5×10~3增加到3.7×10~4,提高约4倍。在此基础上选择了应用于少量铝(矿石)的测定的最佳条件,用碱熔法消除Fe(Ⅲ)、Ti(Ⅳ)、Bi(Ⅲ)等的干扰,对于不含钼和铌的样品分析结果满意。
In the presence of cationic surfactants, the reaction of Al (Ⅲ) with catechin violet (PV) has been reported. We studied the complexation reaction of Al (Ⅲ) with bromopyrogallol red (BPR) in the presence of cetylpyridinium bromide (CPB) and found that in the presence of BPR, a high complex ratio of Al- The Bmax of the BPR-CPB (1: 4: 3) micellar complex (1: 2 binary complex without CPB) The increase from 50nm to 70nm, the sensitivity increased from 9.5 × 10 ~ 3 to 3.7 × 10 ~ 4, increased about 4 times. On this basis, the optimum conditions for the determination of a small amount of aluminum (ore) were selected, and the interference of Fe (Ⅲ), Ti (Ⅳ), Bi (Ⅲ) Satisfactory results of sample analysis.