Abstract
A new method is descibed forthe determination of copper. Fom a suitable solution, copper is extracted as its 8-hydroxyquinaldine complex into chloroform. The solution is diluted with an equal volume of benzene and passed through an activated alumina chromatographic column, whereupon all the 8-hydroxyquinaldates, except that of chromium, are adsorbed. Copper is eluted completely by developing the column with a 0.5% solution of 8-hydroxyquinaldine in that solvent mixture. The optical density of the cluate is measured at 400 mμ with respect to the solvent. Iron, molybdenum and vanadium interfere, but interference due to iron and molybdenum is readily overcome by a simple preliminary treatmont.
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