Bioaccumulation of hexachlorobenzene in Eisenia foetida at dierent aging stages  

作　　者：GAO Hongjian School of Resources and Environmental Science, Anhui Agricultural University, Hefei 230036, China. 

出　　处：《Journal of Environmental Sciences》2009年第7期948-953,共6页环境科学学报（英文版）

基　　金：supported by the Open Fund of State Key Laboratory of Soil and Sustainable Agriculture, In- stitute of Soil Science, Chinese Academy of Sciences (No. 0812000037);the Natural Science Research Program of Anhui Education Department of China (No. 2006KJ175B)

摘　　要：The impacts of contact time on the extractability, the availability of bexachlorobenzene （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.The impacts of contact time on the extractability, the availability of bexachlorobenzene （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.

关 键 词：HCB soil EXTRACTABILITY BIOAVAILABILITY EARTHWORM 

分 类 号：X174[环境科学与工程—环境科学]