title: Preconcentration and atomic absorption determination of iron by sequential injection analysis.
abstract: A sequential injection analysis (SIA) assembly for the atomic absorption determination of Fe(III) in natural waters is proposed. Iron is preconcentrated on a microcolumn packed with a chelating resin (Chelex 100) that is inserted in the manifold. The sample is passed through the column and the iron retained by the resin is subsequently eluted with 2 M HNO(3). The proposed SIA system affords automatic preconcentration, elution, detection of Fe(III), data acquisition and treatment. When 9 ml of iron solution containing 0.4 or 1 mg l(-1) was passed through the resin, the retention efficiency was 93.1 +/- 0.6 and 7.4 +/- 3.0% respectively, and when 27 ml of iron solution of 0.2 mg l(-1) was preconcentrated, the retention was 8.4 +/- 2.9%. The detection limits thus achieved is 12 mug l(-1) when 9 ml of sample are preconcentrated and 6 mug l(-1) for 27 ml.
authors.affiliation: Department of Analytical Chemistry, University of Santiago de Compostela, Av. de las Ciencias s/n, 15706, Santiago de Compostela, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Rubí
authors.forename: M S
authors.initials: MS
authors.lastname: Jiménez
authors.forename: F B
authors.initials: FB
authors.lastname: de Mirabó
authors.forename: R
authors.initials: R
authors.lastname: Forteza
authors.forename: V
authors.initials: V
authors.lastname: Cerdà