title: Total reflection X-ray spectrometry (TXRF) for trace elements assessment in edible clams.
abstract: The present contribution presents a preliminary investigation of the chemical composition with respect to major, minor, trace, and ultratrace elements in several clam species that are frequently used for human consumption in Portuguese markets and worldwide. In order to use a simple and rapid analytical methodology for clam analysis, energy dispersive X-ray fluorescence (EDXRF) spectrometry and total reflection X-ray fluorescence (TXRF) spectrometry were selected as analytical techniques. The analytical capabilities of TXRF spectrometry were evaluated for the determination of minor and trace elements in commercial edible clams. We compared the direct analysis of powdered suspensions (using different sample amounts and dispersant agents) with the analysis of the digested samples for trace element determination. Inductively coupled plasma mass spectrometry analysis of clam digests was also performed to evaluate the analytical possibilities of TXRF spectrometry for trace and ultratrace analysis.
authors.affiliation: Department of Chemistry, University of Girona, Campus Montilivi, 17071 Girona, Spain.
authors.forename: Eva
authors.initials: E
authors.lastname: Marguí
authors.forename: Alexandra
authors.initials: A
authors.lastname: de Fátima Marques
authors.forename: Maria
authors.initials: M
authors.lastname: de Lurdes Prisal
authors.forename: Manuela
authors.initials: M
authors.lastname: Hidalgo
authors.forename: Ignasi
authors.initials: I
authors.lastname: Queralt
authors.forename: Maria Luisa
authors.initials: ML
authors.lastname: Carvalho
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000737:chemistry*; D005060:Europe; D013058:Mass Spectrometry; D008670:Metals / Q000032:analysis*; D012758:Shellfish / Q000032:analysis*; D013052:Spectrometry, X-Ray Emission / Q000379:methods*; D014421:Turkey; D014744:Vietnam
chemical_list: D008670:Metals