Contaminant source apportionment by PIMMS lead isotope analysis and SEM-image analysis |
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Authors: | McGill R A Pearce J M Fortey N J Watt J Ault L Parrish R R |
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Affiliation: | (1) NERC Isotope Geosciences Lab, University of Middlesex, Keyworth, UK;(2) British Geological Survey, University of Middlesex, Keyworth, UK;(3) Urban Pollution Research Centre, University of Middlesex, Keyworth, UK |
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Abstract: | By combining scanning electron microscopy (SEM) image analysis and laser ablation plasma ionisation multi-collector mass spectrometry (LA-PIMMS), high precision lead isotope analyses can be obtained from individual metal-rich particles. Soils from Wolverhampton and Nottingham were sampled on the basis of high Pb concentrations or brownfield location. Pressed powder pellets of each were rastered by LA-PIMMS to obtain a bulk Pb-isotope signature. The results plot along an apparent mixing line between the major sources of lead contamination in the UK, that is UK ore deposits and alkyl-lead from petrol additives (Australian ore). Two particularly lead-rich soils were chosen to investigate the lead distribution and isotope variability between size and density fractions. The fine-grained and low-density fractions contained most of the lead and have Pb-isotope ratios comparable with the bulk soils. By contrast, the small, lead-enriched denser fractions contained only a minor proportion of the total lead but Pb-isotope signatures indicating relative enrichment in one or other of the end-members from the mixing line. Further characterisation of individual Pb-rich grains is in progress. |
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Keywords: | brownfield soils lead isotopes metal-rich particles SEM image analysis |
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