01998naa a2200265 a 450000100080000000500110000800800410001910000180006024501680007826000090024652012090025565000190146465000100148365000090149365300130150265300160151565300260153165300230155765300160158065300150159670000160161170000170162770000170164477300710166119338682012-09-17       2012    bl uuuu     u00u1 u    #d1 aDUARTE, A. P.  aChanges in the forms of lead and manganese in soils by passage through the gut of the tropical endogeic earthworm (Pontoscolex corethrurus).h[electronic resource]  c2012  aTo investigate the effect of the soil passage through the gut of earthworms (Pontoscolex corethrurus) on the forms of Pb and Mn, casts and soil samples were analyzed by sequential extraction procedure. Soil samples were collected in an area under direct influence of mining and metallurgy of Pb in the Parana state, Brazil. The earthworms were incubated with the soils to collect castings. The Pb and Mn concentrations were determined in seven sequential phases: soluble; exchangeable; carbonate; organic matter; Fe and Mn oxides; Al oxides and aluminosilicates; residual. There was intense contamination with Pb in the area, mainly in the clayish soil surrounding the factory by the deposition of suspended material coming from the chimneys (maximum concentration 9716 mg kg1). On the other hand, total concentration of soil Mn was little influenced by the mining and metallurgy activities in the area. The earthworms significantly reduced the amount of Pb in the soluble and exchangeable forms in the soil, considered environmentally more bioavailable. There was also a significant increase in Pb bound in Fe and Mn oxides in the casts (specific absorption), which is desirable for soil bioremediation.  aContaminação  aOxido  aSolo  aCastings  aPb toxicity  aSequential extraction  aSoil contamination  aSoil oxides  aToxicidade1 aMELO, V. F.1 aBROWN, G. G.1 aPAULETTI, V.  tEuropean Journal of Soil Biologygv. 53, p. 32-39, Nov./Dec. 2012.