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Type: Journal article
Title: Biological and chemical assessments of zinc ageing in field soils
Author: Donner, E.
Broos, K.
Heemsbergen, D.
Warne, M.
McLaughlin, M.
Hodson, M.
Nortcliff, S.
Citation: Environmental Pollution, 2010; 158(1):339-345
Publisher: Elsevier Sci Ltd
Issue Date: 2010
ISSN: 0269-7491
Statement of
Erica Donner, Kris Broos, Diane Heemsbergen, Michael St. J. Warne, Mike J. McLaughlin, Mark E. Hodson and Stephen Nortcliff
Abstract: As zinc (Zn) is both an essential trace element and potential toxicant, the effects of Zn fixation in soil are of practical significance. Soil samples from four field sites amended with ZnSO4 were used to investigate ageing of soluble Zn under field conditions over a 2-year period. Lability of Zn measured using 65Zn radioisotope dilution showed a significant decrease over time and hence evidence of Zn fixation in three of the four soils. However, 0.01 M CaCl2 extractions and toxicity measurements using a genetically modified lux-marked bacterial biosensor did not indicate a decrease in soluble/bioavailable Zn over time. This was attributed to the strong regulatory effect of abiotic properties such as pH on these latter measurements. These results also showed that Zn ageing occurred immediately after Zn spiking, emphasising the need to incubate freshly spiked soils before ecotoxicity assessments. Ageing effects were detected in Zn-amended field soils using 65Zn isotopic dilution as a measure of lability, but not with either CaCl2 extractions or a lux-marked bacterial biosensor.
Keywords: Attenuation
Isotopic dilution
Lux biosensor
DOI: 10.1016/j.envpol.2009.06.034
Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications
Environment Institute publications

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