Lability of Pb in soil: effects of soil properties and contaminant source

Mao, Lingchen; Bailey, Elizabeth H.; Chester, Jonathan; Dean, Joseph; Ander, E. Louise; Chenery, Simon R.; Young, Scott D.. 2014 Lability of Pb in soil: effects of soil properties and contaminant source. Environmental Chemistry, 11 (6). 690-701.

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Lability of lead in soils is influenced by both soil properties and source(s) of contamination. We investigated factors controlling Pb lability in soils from (i) land adjacent to a major rural road, (ii) a sewage processing farm and (iii) an archive of the geochemical survey of London. We measured isotopically exchangeable Pb (E-values; PbE), phase fractionation of Pb by a sequential extraction procedure (SEP) and inferred source apportionment from measured Pb isotopic ratios. Isotopic ratios (206Pb/207Pb and 208Pb/207Pb) of total soil Pb fell on a mixing line between those of petrol and UK coal or Pb ore. The main determinant of the isotopically exchangeable Pb fraction (%E-value) was soil pH: %E-values decreased with increasing pH. In rural roadside topsoils, there was also evidence that petrol-derived Pb remained more labile (35 %) than Pb from soil parent material (27 %). However, in biosolid-amended and London soils, %E-values were low (~25 %), covered a restricted range and showed no clear evidence of source-dependent lability.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 1448-2517
Date made live: 23 Mar 2015 14:53 +0 (UTC)

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