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    Organic compounds leached from fast pyrolysis mallee leaf and bark biochars

    Access Status
    Fulltext not available
    Authors
    Lievens, Caroline
    Mourant, Daniel
    Gunawan, Richard
    Hu, Xun
    Wang, Yi
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Lievens, C. and Mourant, D. and Gunawan, R. and Hu, X. and Wang, Y. 2015. Organic compounds leached from fast pyrolysis mallee leaf and bark biochars. Chemosphere. 139: pp. 659-664.
    Source Title
    Chemosphere
    DOI
    10.1016/j.chemosphere.2014.11.009
    ISSN
    00456535
    School
    Centre for Fuels and Energy (COE)
    URI
    http://hdl.handle.net/20.500.11937/31529
    Collection
    • Curtin Research Publications
    Abstract

    Characterization of organic compounds leached from biochars is essential in assessing the possible toxicity of the biochar to the soils’ biota. In this study the nature of the leached organic compounds from Mallee biochars, produced from pyrolysis of Mallee leaf and bark in a fluidised-bed pyrolyser at 400 and 580 C was investigated. Light bio-oil compounds and aromatic organic compounds were investigated. The ‘bio-oil like’ light compounds from leaf and bark biochars ’surfaces were obtained after leaching the chars with a solvent, suitable to dissolve the respective bio-oils. GC/MS was implemented to investigate the leachates. Phenolics, which are potentially harmful toxins, were detected and their concentration shown to be dependent on the char’s origin and the char production temperature. Further, to simulate biochars amendment to soils, the chars were leached with water. The water-leached aromatic compounds from leaf and bark biochars were characterized using UV-fluorescence spectroscopy. Those results suggested that biochars contain leachable compounds of which the nature and amount is dependenton the biomass feedstock, pyrolysis temperature and leaching time.

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