Various colorimetric reagents have been examined for their sensitivity in a standard method for determining aluminium in ferrous metals. Interfering elements are removed by a mercury-cathode separation followed by cupferron-chloroform extraction. In the method adopted, aluminium is determined by measuring the optical density of its complex with Alizarin red S-calcium reagent. The method has been tested with a wide range of steels.
J. A. Corbett and B. D. Guerin, Analyst, 1966, 91, 490 DOI: 10.1039/AN9669100490
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