Show simple item record  

dc.contributor.authorGaw, Sally K.
dc.contributor.authorNorthcott, Grant
dc.contributor.authorKim, Nicholas D.
dc.contributor.authorWilkins, Alistair L.
dc.contributor.authorJensen, J
dc.date.accessioned2013-01-08T20:52:49Z
dc.date.available2013-01-08T20:52:49Z
dc.date.copyright2012-06-18
dc.date.issued2012
dc.identifier.citationGaw, S., Northcott, G., Kim, N., Wilkins, A., & Jensen, J. (2012). Comparison of earthworm and chemical assays of the bioavailability of aged 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene, 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane, and heavy metals in orchard soils. Environmental Toxicology and Chemistry, 31(6), 1306-1316.en_NZ
dc.identifier.issn1552-8618
dc.identifier.urihttps://hdl.handle.net/10289/6993
dc.description.abstractOrchard soils can contain elevated concentrations of 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (p,p′-DDE), 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (p,p′-DDT), and heavy metals as a result of historical agrichemical applications. The bioavailability of p,p′-DDE, p,p′-DDT, As, Cd, Cu, and Pb from five field-aged New Zealand orchards and three grazing soils was assessed by using a 28-d bioassay with Aporrectodea caliginosa and chemical assays. Significant relationships were found between total soil and earthworm tissue concentrations for p,p′-DDE (p < 0.001), p,p′-DDT (p < 0.001), Cu (p < 0.001), and Pb (p < 0.01). Two neutral salt solutions, 0.01 M CaCl2 and 1 M NH4NO3, were used as surrogate measures of the bioavailability of heavy metals. Copper was the only heavy metal for which significant correlations were found between neutral-salt-extractable and earthworm tissue concentrations (p < 0.001). Up to 28% of the aged DDT residues were released from the soils by Tenax over a 24-h extraction period. Significant relationships (p < 0.01) between the Tenax-extractable and earthworm tissue concentrations for p,p′-DDE and p,p′-DDT showed that Tenax provides a good surrogate measure of the bioavailability of these compounds to A. caliginosa. Surprisingly, there was a similarly significant relationship (p < 0.001) between the total soil and earthworm tissue concentrations for p,p′-DDE and p,p′-DDT, suggesting that total soil concentrations alone were sufficient to predict uptake by A. caliginosa. These results demonstrate that the aged agrichemical residues in orchard soils, and particularly p,p′-DDE and p,p′-DDT, remain highly bioavailable to A. caliginosa despite decades of weathering and continue to present an environmental risken_NZ
dc.language.isoen
dc.relation.ispartofEnvironmental Toxicology and Chemistry
dc.subjectBioavailabilityen_NZ
dc.subjectEarthwormsen_NZ
dc.subjectp,p′-DDEen_NZ
dc.subjectp,p′-DDTen_NZ
dc.subjectHeavy metalen_NZ
dc.titleComparison of earthworm and chemical assays of the bioavailability of aged 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene, 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane, and heavy metals in orchard soilsen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.1002/etc.1817en_NZ


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record