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  • Sequential determination of Cd and Cr in biomass samples and their ashes using high-resolution continuum source graphite furnace atomic absorption spectrometry and direct solid sample analysis.

    Author(s) : Duarte, A. T.Dessuy, M. B.Vale, M. G. R.Welz, B.Andrade, J. B. de

    Author Affiliation : Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil.

    Author Email : mgrvale@ufrgs.brmgrvale@gmail.com

    Journal article : Talanta 2013 Vol.115 pp.55-60 ref.41

    Abstract : High-resolution continuum source graphitegraphiteSubject Category: Chemicals and Chemical Groups
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    furnace atomic absorption spectrometry, because of the use of only one radiation source for all elements, offers the possibility of sequential determination of two or more elements from the same sample aliquot if their volatilities are significantly different. Cd and Cr were determined sequentially in samples of biomassbiomassSubject Category: Miscellaneous
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    and biomass ashes employing direct solid sample analysis. The use of a chemical modifier was found to be not necessary, and calibration could be carried out using aqueous standard solutions. A pyrolysispyrolysisSubject Category: Techniques, Methodologies and Equipment
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    temperature of 400°C and an atomizationatomizationSubject Category: TechniquestechniquesSubject Category: Techniques, Methodologies and Equipment
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    , Methodologies and Equipment

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    temperature of 1500°C were used for the determination of Cd; no losses of Cr were observed at this temperature. After the atomization of Cd the wavelength was changed and Cr atomized at 2600°C. The limits of detection (LOD) and quantification (LOQ) were 1.1 µg kg-1 and 3.7 µg kg-1, respectively, for Cd and 21 µg kg-1 and 70 µg kg-1, respectively, for Cr using the most sensitive line at 357.869 nm, or 90 µg kg-1 and 300 µg kg-1, respectively, using the less sensitive line at 428.972 nm. The precision, expressed as relative standard deviation was around 10%, which is typical for direct solid sample analysis. The values found for Cd in biomass samples were between <1.1 µg kg-1 and 789 µg kg-1, whereas those for Cr were between 7.9 mg kg-1 and 89 mg kg-1; the values found in the ashes were significantly lower for Cd, between <1.1 µg kg-1 and 6.3 µg kg-1, whereas the trend was not so clear for Cr, where the values were between 3.4 mg kg-1 and 28 mg kg-1.

    ISSN : 0039-9140

    DOI : 10.1016/j.talanta.2013.04.036

    Record Number : 20133416065

    Publisher : Elsevier B.V.

    Location of publication : Amsterdam

    Country of publication : Netherlands

    Language of text : English

    Indexing terms for this abstract:

    Descriptor(s) : analytical methodsanalytical methodsSubject Category: Techniques, Methodologies and Equipment
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    , ashashSubject Category: Miscellaneous
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    , atomic absorption spectrophotometryatomic absorption spectrophotometrySubject Category: Techniques, Methodologies and Equipment
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    , atomizationatomizationSubject Category: Techniques, Methodologies and Equipment
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    , biomassbiomassSubject Category: Miscellaneous
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    , cadmiumcadmiumSubject Category: Chemicals and Chemical Groups
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    , chromiumchromiumSubject Category: Chemicals and Chemical Groups
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    , furnacesfurnacesSubject Category: Techniques, Methodologies and Equipment
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    , graphitegraphiteSubject Category: Chemicals and Chemical Groups
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    , heavy metalsheavy metalsSubject Category: Chemicals and Chemical Groups
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    , pyrolysispyrolysisSubject Category: Techniques, Methodologies and Equipment
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    , techniquestechniquesSubject Category: Techniques, Methodologies and Equipment
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    Identifier(s) : analytical techniques