Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 21, Issue 7, Pages 948-953Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(08)62366-9
Keywords
HCB; soil; extractability; bioavailability; earthworm
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Funding
- Open Fund of State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences [0812000037]
- Natural Science Research Program of Anhui Education Department of China [2006KJ175B]
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The impacts of contact time on the extractability, the availability of hexachlorobenzene (HCB) in different soils (paddy soil, red soil, and fluvo-aquic soil) and bioaccumulation in earthworm Eisenia foetida were investigated under controlled conditions in laboratory. Results indicated that the aging rate of HCB displaying a biphasic character in different soils: a rapid aging in the first 60 d followed by a slow aging in the next 120 d incubation time. Moreover, most of extractable HCB (about 90%) decline occurred in the first 60 d after HCB was spiked into the soils. The aging rate of HCB in the paddy soil was higher than that in the fluvo-aquic soil or the red soil. The amount of HCB accumulated in the earthworms and its accumulative ability, expressed as a bioaccumulation factor (BAF), declined as the aging time increased from 1 to 180 d. Although the extractable HCB decreased with increasing residence time in soil, much of HCB could still be accumulated by earthworms (457.6-984.3 ng/g) through bioaccumulation, which poses a potential risk to soil ecological safety.
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