摘要：Leaching of Pb (lead), Mn (manganese), Cu (copper), Zn (zinc) and Cd (cadmium) in coastal loamy field soiltreated with Municipal Solid Waste @ 10, 20, 50, 75, and 100 t/ha was assessed at Puducherry in relationto the native soil without treatment. The concentrations (ppm) of the heavy metals on the soil surface (0 cm),10, 20 and 30cm sub-layers across the treatments and native soil showed that the Pb and Mn concentrationswere higher in surface layer and gradually decreased in 10 and 20cm layers, and was low in 30cm layeracross the treatments. However, the concentrations of Cu, Zn, and Cd were less in the surface layer andgradually increased in the sub- layers of the soil and were high at 30 cm layer. Among the leached heavymetals, Cu was in higher concentration in the surface layer and the ranking order was Cu > Cd > Zn > Mn >Pb in surface layer across the treatments. The ranking order of the metals at 30 cm depth was same as thatof surface with the same ranking order. Thus, the leaching was higher in Cu, Cd and Zn than in Mn and Pb,the latter two being almost immobile and more concentrated in the surface layer. The concentrations ofthese heavy metals in different layers across the treatments were significantly different from each other (P <0.01) and higher compared to that of the native soil.
