Abstract
In the presence ofn-tetradecyltrimethylammonium bromide aluminium reacts with Bromopyrogallol Red (BPR) to form a ternary complex, in which the molar ratio of aluminium ot BPR is 1∶2. The method is suitable for the determination of traces of aluminium in natural waters. The ternary complex has an absorbance maximum at 623 mm with molar absorptivity 5.05×104 l · mole−1 · cm−1. Beer's law is obeyed over the range 0.1–0.4μg/ml of aluminium. Iron(II) and iron(III) interfere but can be masked with hydroxylammonium chloride and 1,10-phenanthroline. Aluminium can be determined at about the 100-μg/l level in river water.
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