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Evaluates aluminium detection in water using ammonium aurin tricarboxylate, implying high sensitivity for environmental monitoring.
A method is described for the colorimetric determination of aluminium in water using ammonium aurin tricarboxylate at a controlled pH. Reaction of iron is inhibited by the addition of thioglycollic acid to form ferrous thioglycollate which is colourless at the pH of the test solution (4.4). The test is sensitive to 0.3 μg. aluminium and satisfactory results have been obtained over a range of 0–20 μg. Anions and cations in amounts normally present in water do not interfere, but some interference is obtained with excessive quantities. Hexametaphosphate and pyrophosphate interfere but these can be removed by hydrolysis to orthophosphate. The test can be applied to the analysis of various alkali products after conversion to sodium chloride if a calibration curve is prepared in the presence of the appropriate amount of sodium chloride.
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Rolfe et al. (1951) studied this question.
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