title: Determination of beryllium by electrothermal atomic absorption spectrometry using tungsten surfaces and zirconium modifier.
abstract: Electrothermal atomization of beryllium from graphite and tungsten surfaces was compared with and without the use of various chemical modifiers. Tungsten proved to be the best substrate, giving the more sensitive integrated atomic absorption signals of beryllium. Tungsten platform atomization with zirconium as a chemical modifier was used for the determination of beryllium in several NIST SRM certified reference samples, with good agreement obtained between the results found and the certified values. The precision of the measurements (at 10 microgL(-1)), the limit of detection (3sigma), and the characteristic mass of beryllium were 2.50%, 0.009 microgL(-1) and 0.42 pg, respectively.
authors.affiliation: Department of Applied Chemistry and Physics, Area of Analytical Chemistry, Faculty of Biological and Environmental Sciences, University of León, E-24071 León, Spain.
authors.forename: M A
authors.initials: MA
authors.lastname: Castro
authors.forename: L C
authors.initials: LC
authors.lastname: Robles
authors.forename: J M
authors.initials: JM
authors.lastname: Lumbreras
authors.forename: B
authors.initials: B
authors.lastname: de Celis
authors.forename: A J
authors.initials: AJ
authors.lastname: Aller
authors.forename: D
authors.initials: D
authors.lastname: Littlejohn
mesh_terms: D001608:Beryllium / Q000032:analysis*; D006108:Graphite / Q000737:chemistry; D009330:Nebulizers and Vaporizers; D013054:Spectrophotometry, Atomic / Q000295:instrumentation / Q000379:methods*; D013696:Temperature; D013997:Time Factors; D014414:Tungsten / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D006108:Graphite; D015040:Zirconium; D001608:Beryllium; D014414:Tungsten