期刊
ENVIRONMENTAL POLLUTION
卷 173, 期 -, 页码 68-74出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2012.10.001
关键词
Lead; Zinc; Ligand speciation; Earthworm; Ingested soil; Microfocus X-ray spectroscopy; Synchrotron
资金
- SRS (Daresbury) beamtime awards [45141, 47157]
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 Zn-3(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 angstrom (or nitrogens at 1.96 angstrom); (iii) the best fit for Pb in tissue was with a shell of oxygens at 2.18 angstrom and a shell of sulphurs at 2.67 angstrom; (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. (C) 2012 Elsevier Ltd. All rights reserved.
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