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Pb and Zn imaging and in situ speciation at the geogenic/biogenic interface in sentinel earthworms using electron microprobe and synchrotron micro-focus X-ray spectroscopy

Morgan, Andrew John, Kille, Peter, Bennett, A., O'Reilly, Michael, Fisher, Peter Charles and Charnock, J. M. 2013. Pb and Zn imaging and in situ speciation at the geogenic/biogenic interface in sentinel earthworms using electron microprobe and synchrotron micro-focus X-ray spectroscopy. Environmental Pollution 173 , pp. 68-74. 10.1016/j.envpol.2012.10.001

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Abstract

Using synchrotron- and electron microscope-based X-ray microanalyses, the distribution and speciation of Zn and Pb were examined in situ in two earthworm species (Dendrodrilus rubidus and Lumbricus rubellus) living in heavily-polluted soils. Main findings: (i) Zn spectra in ingested soil and in tissues more closely resembled Zn3(PO4)2 than ZnS; (ii) Zn speciation in tissues gave a best fit for Zn to the inner shell of 4 oxygens at 1.94 Å (or nitrogens at 1.96 Å); (iii) the best fit for Pb in tissue was with a shell of oxygens at 2.18 Å and a shell of sulphurs at 2.67 Å; (iv) a component of the Zn and much of the Pb detectable in gut contents was co-distributed with S; (v) Zn and Pb display ‘soft’ acid affinities in soil, but ‘hard’ acid affinities in tissue. This is the first metal characterisation study conducted on an invertebrate quench-frozen in the field.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Earth and Ocean Sciences
Subjects: Q Science > QH Natural history > QH301 Biology
Uncontrolled Keywords: Lead; Zinc; Ligand speciation; Earthworm; Ingested soil; Microfocus X-ray spectroscopy; Synchrotron
Publisher: Elsevier
ISSN: 0269-7491
Last Modified: 24 Jun 2017 10:02
URI: http://orca.cf.ac.uk/id/eprint/45587

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