TY - JOUR
T1 - Biological and chemical assessments of zinc ageing in field soils
AU - Donner, Erica
AU - Broos, Kris
AU - Heemsbergen, Diane
AU - Warne, Michael St. J.
AU - McLaughlin, Mike J.
AU - Hodson, Mark E.
AU - Nortcliff, Stephen
PY - 2010/1
Y1 - 2010/1
N2 - 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 Zn-65 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. (C) 2009 Elsevier Ltd. All rights reserved.
AB - 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 Zn-65 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. (C) 2009 Elsevier Ltd. All rights reserved.
UR - http://www.scopus.com/inward/record.url?scp=74249084938&partnerID=8YFLogxK
U2 - 10.1016/j.envpol.2009.06.034
DO - 10.1016/j.envpol.2009.06.034
M3 - Article
VL - 158
SP - 339
EP - 345
JO - Environmental Pollution
JF - Environmental Pollution
SN - 0269-7491
IS - 1
ER -