title: The determination of molybdenum in a sea water candidate reference material by inductively coupled plasma-mass spectrometry.
abstract: In the framework of a certification campaign organized by BCR (Bureau Communautaire de Référence, Commission of the European Communities, Brussels) molybdenum was determined in a sea water candidate reference material (BCR CRM 403) using inductively coupled plasma-mass spectrometry. The determination was hampered by both non-spectral (signal suppression) and spectral interferences. Ten-fold dilution of the sea water and the use of a carefully selected internal standard allowed accurate correction for the signal suppression. Spectral interferences on Mo nuclides could mainly be attributed to BrO(+) and BrOH(+) ions. At the level of spectral overlap encountered, these interferences could be corrected for with sufficient accuracy by matrix matching of the blank for Br or by application of a mathematical correction method involving resolvation of a pair of simultaneous equations. Results obtained after application of anion exchange to separate Br from Mo confirmed the results obtained using the correction methods, proving the validity of the latter. A good agreement is established by comparison of the ICP-MS result with those obtained by other techniques in other laboratories.
authors.affiliation: Laboratory of Analytical Chemistry, Ghent University, Institute for Nuclear Sciences, Proeftuinstraat 86, B-9000 Ghent, Belgium.
authors.forename: F
authors.initials: F
authors.lastname: Vanhaecke
authors.forename: J
authors.initials: J
authors.lastname: Goossens
authors.forename: R
authors.initials: R
authors.lastname: Dams
authors.forename: C
authors.initials: C
authors.lastname: Vandecasteele