Ion Beam Analyses Of Bark And Wood In Environmental Studies

Jan-Olof Lill, K-E Saarela, L. Harju, Johan Rajander, A. Lindroos, S-J Heselius

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    A large number of wood and bark samples have been analysed utilizing particle-induced X-ray emission (PIXE) and particle-induced gamma-ray emission (PIGE) techniques. Samples of common tree species like Scots Pine, Norway Spruce and birch were collected from a large number of sites in Southern and Southwestern Finland. Some of the samples were from a heavily polluted area in the vicinity of a copper-nickel smelter. The samples were dry ashed at 550 degrees C for the removal of the organic matrix in order to increase the analytical sensitivity of the method. The sensitivity was enhanced by a factor of 50 for wood and slightly less for bark. The ashed samples were pressed into pellets and irradiated as thick targets with a millimetre-sized proton beam. By including the ashing procedure in the method, the statistical dispersion due to elemental heterogeneities in wood material could be reduced. As a by-product, information about the elemental composition of ashes was obtained. By comparing the concentration of an element in bark ash to the concentration in wood ash of the same tree useful information from environmental point of view was obtained. The obtained ratio of the ashes was used to distinguish between elemental contributions from anthropogenic atmospheric sources and natural geochemical sources, like soil and bedrock.
    Original languageUndefined/Unknown
    Pages (from-to)225–229
    Number of pages5
    JournalAIP Conference Proceedings
    Publication statusPublished - 2011
    MoE publication typeA1 Journal article-refereed


    • bark
    • dry-ashing
    • elemental analyses
    • environmental studies
    • PIXE
    • wood

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