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Fig. 12.7 Concentrations of a colloidal Pb and b dissolved Pb of soil suspensions extracted from
soil at various pHs by KOH and Ca(OH)
2
(Klitzke et al.
2008
). Reprinted from Klitzke et al.
(
2008
). Copyright 2008 with permission of John Wiley and Sons
The redistribution under leaching of nickel was then tested in column experi-
ments, using a sandy loam topsoil of the Sonning Series (Reading, Berkshire, UK).
Leachate samples were collected during leaching with 10 pore volumes. The pH
values of the control and sludge-amended columns ranged between 7 and 8 and
remained consistent through leaching. Column effluent concentrations of dissolved
organic carbon (DOC) and Ni through the control and sludge-amended soil col-
umns are presented in Fig.
12.8
. Ashworth and Alloway (
2004
) observed that the
Ni-sludge breakthrough curve is similar to the DOC-sludge curve, and that in both
