title: Preconcentration and determination of inorganic arsenic using a multisyringe flow injection system and hydride generation-atomic fluorescence spectrometry.
abstract: A new multisyringe flow injection system for inorganic arsenic determination at trace levels by hydride generation-atomic fluorescence spectrometry (HGAFS) is presented. Preconcentration on a solid-phase was carried out using a column packed with an anion-exchange resin (Amberlite IRA-410). The reagents are dispensed to the system using a multisyringe burette coupled with two multi-port selection valves. Different parameters were changing in order to make the system as effective as possible. An analytical curve was obtained for arsenic determination between 50 and 2000ngl(-1). This new approach improved five times the sensitivity over a MSFIA-HGAFS technique developed previously by the authors. Detection limit of the proposed technique was (3sigma(b)/S) of 30ngl(-1). The relative standard deviation (R.S.D.) of As at 1mugl(-1) was 4.8% (n=7). A sample throughput of 10h(-1) has been achieved. The proposed method has been applied to different reference solid and water materials with satisfactory results.
authors.affiliation: Department of Chemistry, University of the Balearic Islands, Carretera de Valldemossa km. 7.5, E-07122 Palma de Mallorca, Spain.
authors.forename: L O
authors.initials: LO
authors.lastname: Leal
authors.forename: N V
authors.initials: NV
authors.lastname: Semenova
authors.forename: R
authors.initials: R
authors.lastname: Forteza
authors.forename: V
authors.initials: V
authors.lastname: Cerdà