Bioaccumulation and bioavailability of polybrominated diphynel ethers (PBDEs) in soil

Liang, Xianwei; Zhu, Shuzhen; Chen, Peng; Zhu, Lingyan

Bioaccumulation and bioavailability of polybrominated diphynel ethers (PBDEs) in soil

2010

Liang, Xianwei | Zhu, Shuzhen | Chen, Peng | Zhu, Lingyan

Earthworms were exposed to artificially contaminated soils of DE-71 and DE-79 to investigate the bioaccumulation and bioavailability of PBDEs in soil. All major congeners were bioavailable to earthworms. The uptake and elimination rate coefficients of PBDEs decreased with their logKows. The biota soil accumulation factors of PBDEs also declined with logKow. These may be due to the large molecular size and the high affinity of PBDEs to soil particles. The concentrations extracted by Tenax for 6 h correlated very well with those found in earthworms, suggesting that the bioavailability of PBDEs in soil is related to the fraction of rapid desorption from soil. This also indicates that 6 h Tenax extraction is a good proxy for the bioavailability of PBDEs to earthworms in soil. The BSAFs of PBDEs in aged soil decreased 22-84% compared to freshly spiked soil, indicating that aging may diminish the bioavailability of PBDEs in soil significantly.

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