Direct determination of arsenic in sea water by electrothermal atomization atomic absorption spectrometry using D2 and Zeeman background correction |
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Authors: | Pilar Bermejo-Barrera Jorge Moreda-Piñeiro Antonio Moreda-Piñeiro Adela Bermejo-Barrera |
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Affiliation: | (1) Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Chemistry, University of Santiago de Compostela, 15706 Santiago de Compostela, Spain |
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Abstract: | Arsenic in sea water was determined directly by graphite furnace atomic absorption spectrometry (GFAAS) using palladium nitrate as chemical modifier, at an optimum concentration of 15 mg l–1. Deuterium and Zeeman effect background correction were compared and gave detection limits of 0.6 and 0.8 g l–1, respectively. Precisions between 8 and 2%, for both correctors, were obtained with an injection volume of 40 l. The accuracy obtained with different reference materials: CRM-403 (1.461 g kg–1), NASS-4 (1.26 ±0.09 gl–1) and IAEA/W-4 (24–31 g l–1) was studied for large injection volumes for both background correction systems. Interferences by chloride, sodium, potassium, calcium and silicon were removed by Zeeman correction, whereas deuterium correction was much less effective and was insufficiently accurate for sea water samples. |
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Keywords: | arsenic sea water deuterium and Zeeman effect background correction ET-AAS |
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