Increased sensitivity in thick-target particle induced X-ray emission analyses using dry ashing for preconcentration

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

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    Abstract

    The sensitivity in thick-target particle induced X-ray emission (PIXE) analyses of biological materials can be enhanced by dry ashing, The gain depends mainly on the mass reduction factor and the composition of the residual ash, The enhancement factor was 7 for the certified reference material Pine Needles and the limits of detection (LODs) were below 0.2 mu g/g for Zn, Cu, Rb and Sr. When ashing biological materials with low ash contents such as wood of pine or spruce (0.3% of dry weight) and honey (0.1% of wet weight) the gain was far greater. The LODs for these materials were 30 ng/g for wood and below 10 ng/g for honey. In addition, the ashed samples were more homogenous and more resistant to changes during the irradiation than the original biological samples. (C) 1999 Elsevier Science B.V. All rights reserved.
    Original languageUndefined/Unknown
    Pages (from-to)273–278
    Number of pages6
    JournalAnalytica Chimica Acta
    Volume378
    Issue number1-3
    Publication statusPublished - 1999
    MoE publication typeA1 Journal article-refereed

    Keywords

    • dry ashing
    • limits of detection
    • PIXE
    • plant materials
    • preconcentration

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