title: Direct determination of gallium on polyurethane foam by X-ray fluorescence.
abstract: Gallium chloride is easily extracted from 6M HCl by comminuted polyether-type polyurethane foam. After the extraction step, the gallium absorbed by the PU foam can be quantitatively determined by X-ray fluorescence. A procedure for the direct determination of gallium absorbed by PU foam by XRFS is thus described. Gallium is determined at levels as low as 60 ng/ml (C(L)), with a calibration sensitivity of 424 cps ml/mug, within a linear range 0.1-2.30 mug/ml. The procedure investigated was successfully applied to determination of gallium in aluminum alloys, bauxite and industrial residue samples.
authors.affiliation: Instituto de Engenharia Nuclear, Comissão Nacional de Energia Nuclear, Cidade Universitária, Ilha do Fundão-Rio de Janeiro-Brasil 21945-970.
authors.forename: M S
authors.initials: MS
authors.lastname: Carvalho
authors.forename: J A
authors.initials: JA
authors.lastname: Medeiros
authors.forename: A W
authors.initials: AW
authors.lastname: Nóbrega
authors.forename: J L
authors.initials: JL
authors.lastname: Mantovano
authors.forename: V P
authors.initials: VP
authors.lastname: Rocha