Impact of the earthworm Lumbricus terrestris ( L . ) on As , Cu , Pb and Zn mobility 1 and speciation in contaminated

نویسندگان

  • Tom Sizmur
  • Barbara Palumbo-Roe
  • Michael J. Watts
  • Mark E. Hodson
چکیده

17 To assess the risks that contaminated soils pose to the environment properly a greater 18 understanding of how soil biota influence the mobility of metal(loid)s in soils is 19 required. Lumbricus terrestris L. were incubated in three soils contaminated with As, 20 Cu, Pb and Zn. The concentration and speciation of metal(loid)s in pore waters and the 21 mobility and partitioning in casts were compared with earthworm-free soil. Generally 22 the concentrations of water extractable metal(loid)s in earthworm casts were greater 23 than in earthworm-free soil. The impact of the earthworms on concentration and 24 speciation in pore waters was soil and metal specific and could be explained either by 25 earthworm induced changes in soil pH or soluble organic carbon. The mobilisation of 26 metal(loid)s in the environment by earthworm activity may allow for leaching or uptake 27 into biota. 28 29

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تاریخ انتشار 2011