Spectrophotometric determination of aluminium in alloys and ores. Part 1. Removal of interfering metals as their 2-isopropylquinolin-8-ol chelates by precipitation and extraction

Abstract

A simple and rapid method for determining aluminium in permanent magnet alloy, iron and manganese ores and nimonic 90 alloy is described. The sample is dissolved in acid and the aluminium is separated from the interfering metals such as iron, cobalt, nickel, chromium, copper, manganese and titanium by extracting these into chloroform as their 2-isopropylquinolin-8-ol chelates. The aluminium is left behind and is extracted into chloroform as its quinolin-8-ol chelate and determined spectrophotometrically. For aluminium contents ranging from about 7 to 1.4% the method uses a sample mass of between 500 and 2000 µg present in the aliquot taken and can therefore be considered as a useful microchemical technique.