Abstract
The elimination of Fe Kα interference in the determination of cobalt by energy dispersive XRFA is investigated. Two procedures are compared: a) Elution of iron from cellulose Hyphan filters used for the preconcentration of metal ions from solution prior to XRF analysis; cobalt is not eluted and can subsequently be determined free from interference. b) Selective prevention of the sorption of iron onto cellulose Hyphan filters by boiling the analytical solution in the presence of 1% H2O2 before starting the sorption process. The methods are applied to the analysis of municipal water and rain water samples. The detection limit for cobalt is 0.4 μg/l in presence of up to 1 mg/l Fe.
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