Determination of chromium in aluminium salts by atomic-absorption spectroscopy
Abstract
Chromium can be determined in the presence of preponderant amounts of aluminium salts by extraction of chromium(VI) into isobutyl methyl ketone, and aspiration of the extract into an air-acetylene flame for measurement of atomic absorption at 359·3 nm. None of the other trace elements commonly present in aluminium salts interferes in the determination. The “sensitivity”(p.p.m. for 0·005 absorbance unit) corresponds to 30 p.p.m. in solid Al2O3.