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Tungsten Permanent Chemical Modifier for Fast Estimation of Se Contents in Soil by Graphite Furnace Atomic Absorption Spectrometry

Rosa, Cassia Regina ; Freschi ; de Moraes, Mercedes ; Gomes Neto, José Anchieta ; Nóbrega, Joaquim Araújo ; Araújo Nogueira, Ana Rita ; Sacramento, Luís Vitor

Journal of agricultural and food chemistry, 2003-07, Vol.51 (14), p.3920-3923 [Periódico revisado por pares]

Washington, DC: American Chemical Society

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Título:
Tungsten Permanent Chemical Modifier for Fast Estimation of Se Contents in Soil by Graphite Furnace Atomic Absorption Spectrometry
Autor: Rosa, Cassia Regina ; Freschi ; de Moraes, Mercedes ; Gomes Neto, José Anchieta ; Nóbrega, Joaquim Araújo ; Araújo Nogueira, Ana Rita ; Sacramento, Luís Vitor
Assuntos: absorbance ; Agronomy. Soil science and plant productions ; air ; atomic absorption spectrometry ; Biological and medical sciences ; Chemical Phenomena ; Chemical, physicochemical, biochemical and biological properties ; Chemistry, Physical ; coatings ; detection limit ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Fundamental and applied biological sciences. Psychology ; Geochemistry ; Mineral components. Ionic and exchange properties ; Physics, chemistry, biochemistry and biology of agricultural and forest soils ; pyrolysis ; selenium ; Selenium - analysis ; Selenium - chemistry ; Sensitivity and Specificity ; soil ; Soil - analysis ; Soil and rock geochemistry ; soil sampling ; Soil science ; Spectrophotometry, Atomic - methods ; tungsten ; Tungsten Compounds
É parte de: Journal of agricultural and food chemistry, 2003-07, Vol.51 (14), p.3920-3923
Notas: http://dx.doi.org/10.1021/jf0212439
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Descrição: A tungsten carbide coating on the integrated platform of a transversely heated graphite atomizer was used as a modifier for the direct determination of Se in soil extracts by graphite furnace atomic absorption spectrometry. Diethylenetriaminepentaacetic acid (0.0050 mol L-1) plus ammonium hydrogencarbonate (1.0 mol L-1) extracted predominantly available inorganic selenate from soil. The formation of a large amount of carbonaceous residue inside the atomizer was avoided with a first pyrolysis step at 600 °C assisted by air during 30 s. For 20 μL of soil extracts delivered to the atomizer and calibration by matrix matching, an analytical curve (10.0−100 μg of L-1) with good linear correlation (r = 0.999) between integrated absorbance and analyte concentration was established. The characteristic mass was ∼63 pg of Se, and the lifetime of the tube was ∼750 firings. The limit of detection was 1.6 μg L-1, and the relative standard deviations (n = 12) were typically <4% for a soil extract containing 50 μg of L-1. The accuracy of the determination of Se was checked for soil samples by means of addition/recovery tests. Recovery data of Se added to four enriched soil samples varied from 80 to 90% and indicated an accurate method. Keywords: Selenium; soil; diethylenetriaminepentaacetic acid; tungsten permanent modifier; GFAAS
Editor: Washington, DC: American Chemical Society
Idioma: Inglês

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Tungsten Permanent Chemical Modifier for Fast Estimation of Se Contents in Soil by Graphite Furnace Atomic Absorption Spectrometry

Rosa, Cassia Regina ; Freschi ; de Moraes, Mercedes ; Gomes Neto, José Anchieta ; Nóbrega, Joaquim Araújo ; Araújo Nogueira, Ana Rita ; Sacramento, Luís Vitor

Washington, DC: American Chemical Society

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