Determination of iron in seawater by electrothermal atomic absorption spectrometry and atomic fluorescence spectrometry: a comparative study.

Abstract : Two methods available for direct determination of total Fe in seawater at low concentration level have been examined: electrothermal atomization atomic absorption spectrometry (ETAAS) and electrothermal atomization laser excited atomic fluorescence spectrometry (ETA-LEAFS). In a first part, we have optimized experimental conditions of ETAAS (electrothermal program, matrix chemical modification) for the determination of Fe in seawater by minimizing the chemical interference effects and the magnitude of the simultaneous background absorption signal. By using the best experimental conditions, a detection limit of 80 ng L(-1) (20 microL, 3sigma) for total Fe concentration was obtained by ETAAS. Using similar experimental conditions (electrothermal program, chemical modification), we have optimized experimental conditions for the determination of Fe by LEAFS. The selected experimental conditions for ETA-LEAFS: excitation wavelength (296.69 nm), noise attenuation and adequate background correction led to a detection limit (3sigma) of 3 ng L(-1) (i.e. 54 pM) for total Fe concentration with the use a 20 microL seawater sample. For the two methods, concentration values obtained for the analysis of Fe in a NASS-5 (0.2 microg L(-1)) seawater sample were in good agreement with the certified values.
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Analytica Chimica Acta, Elsevier Masson, 2010, 664 (2), pp.114-20. 〈10.1016/j.aca.2010.02.014〉
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http://hal.univ-brest.fr/hal-01577337
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Soumis le : vendredi 25 août 2017 - 14:54:17
Dernière modification le : jeudi 11 janvier 2018 - 06:17:06

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Jean-Yves Cabon, Philippe Giamarchi, Alain Le Bihan. Determination of iron in seawater by electrothermal atomic absorption spectrometry and atomic fluorescence spectrometry: a comparative study.. Analytica Chimica Acta, Elsevier Masson, 2010, 664 (2), pp.114-20. 〈10.1016/j.aca.2010.02.014〉. 〈hal-01577337〉

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