Spatial and temporal variations in Pb concentrations and isotopic composition in road dust, farmland soil and vegetation in proximity to roads since cessation of use of leaded petrol in the UK

MacKinnon, G. , MacKenzie, A.B., Cook, G.T. , Pulford, I.D., Duncan, H.J. and Scott, E.M. (2011) Spatial and temporal variations in Pb concentrations and isotopic composition in road dust, farmland soil and vegetation in proximity to roads since cessation of use of leaded petrol in the UK. Science of the Total Environment, 409(23), pp. 5010-5019. (doi:10.1016/j.scitotenv.2011.08.010)

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Abstract

Results are presented for a study of spatial distributions and temporal trends in concentrations of lead (Pb) from different sources in soil and vegetation of an arable farm in central Scotland in the decade since the use of leaded petrol was terminated. Isotopic analyses revealed that in all of the samples analysed, the Pb conformed to a binary mixture of petrol Pb and Pb from industrial or indigenous geological sources and that locally enhanced levels of petrol Pb were restricted to within 10 m of a motorway and 3 m of a minor road. Overall, the dominant source of Pb was historical emissions from nearby industrial areas. There was no discernible change in concentration or isotopic composition of Pb in surface soil or vegetation over the decade since the ban on the sale of leaded petrol. There was an order of magnitude decrease in Pb concentrations in road dust over the study period, but petrol Pb persisted at up to 43% of the total Pb concentration in 2010. Similar concentrations and spatial distributions of petrol Pb and non petrol Pb in vegetation in both 2001 and 2010, with enhanced concentrations near roads, suggested that redistribution of previously deposited material has operated continuously over that period, maintaining a transfer pathway of Pb into the biosphere. The results for vegetation and soil transects near minor roads provided evidence of a non petrol Pb source associated with roads/traffic, but surface soil samples from the vicinity of a motorway failed to show evidence of such a source.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Duncan, Dr Henry and Pulford, Dr Ian and Cook, Professor Gordon and Scott, Professor E Marian and MacKenzie, Professor Angus and MacKinnon, Dr Gillian
Authors: MacKinnon, G., MacKenzie, A.B., Cook, G.T., Pulford, I.D., Duncan, H.J., and Scott, E.M.
College/School:College of Science and Engineering > School of Chemistry
College of Science and Engineering > School of Mathematics and Statistics > Statistics
College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Science of the Total Environment
Publisher:Elsevier
ISSN:0048-9697
ISSN (Online):1879-1026
Published Online:09 September 2011
Copyright Holders:Copyright © 2011 Elsevier
First Published:First published in Science of the Total Environment 409(23):5010-5019
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher
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