Bioavailable DDT residues in sediments: laboratory assessment of ageing effects using semi-permeable membrane devices |
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Authors: | Menchai Phanchai Van Zwieten Lukas Kimber Stephen Ahmad Nazir Rao P Suresh C Hose Grant |
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Institution: | Environmental Centre of Excellence, Department of Primary Industries, Wollongbar, NSW, Australia. |
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Abstract: | We describe the reduction in bioavailability of DDT in contaminated soil after it was incubated as sediment for 365 d. Bioavailability was assessed using semi-permeable membranes. Contaminated soils from three cattle dip sites, one spiked paired uncontaminated site, and one spiked OECD standard soil were studied. Sandy soil with residues of 1880 mg/kg summation operator DDT incurred since 1962, initially had 4.6% of summation operator DDT available, reducing to 0.6% following 365 d. Clay soil (1108 mg summation operator DDT/kg) had 4.1% initially available, reducing to 0.3% after 365 d. Freshly spiked soils had a greater amount of DDT initially available (10.9%), but this reduced to 1.5% by the end of the incubation. Of the DDT congeners, both o,p'-DDD and p,p'-DDD were most bioavailable in the soils, but also had the most significant decrease following incubation. |
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Keywords: | Bioavailability Contaminated soil Semi-permeable membrane devices Risk assessment DDT |
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