title: Atomization of Al in a tungsten coil electrothermal atomic absorption spectrophotometer.
abstract: Electrothermal atomic absorption spectrophotometry of Al in a tungsten coil atomizer was evaluated and applied for its determination in hemodialysis fluid. The system was mounted on a Varian Spectra AA-40 spectrophotometer with continuum background correction and all measurements, in peak height absorbance, were done at 309.3 nm. The purge gas was a mixture of 90% Ar plus 10% H(2). Observation height, gas flow, drying, pyrolysis and atomization steps were optimized. The heating program was carried out by employing a heating cycle in four steps: dry, pyrolysis, atomization and clean. The determination of Al in hemodialysis solutions was performed by using a matrix-matching procedure. Al in hemodialysis solutions was determined by TCA and by electrothermal atomization with a graphite tube atomizer. There is no differences between results obtained by both methods at a confidence level of 95%. The characteristic mass of Al by using the TCA was 39 pg and the detection limit was 2.0 mug l(-1).
authors.affiliation: Departamento de Quimica, Universidade Federal de São Carlos, Caixa Postal 676, CEP 13565-905, São Carlos, SP, Brazil.
authors.forename: P O
authors.initials: PO
authors.lastname: Luccas
authors.forename: J A
authors.initials: JA
authors.lastname: Nóbrega
authors.forename: P V
authors.initials: PV
authors.lastname: Oliveira
authors.forename: F J
authors.initials: FJ
authors.lastname: Krug