Geoscience Reference
In-Depth Information
Fig. 8.53 Soil arsenic
concentration (raw data)
distribution in a Gainesville
(n = 200), b Miami
(n = 240), and c nonurban
areas (n = 448) in Florida
(Chirenje et al.
2003
)
consequence, arsenic concentrations in urban soils showed greater variation than
those from relatively undisturbed nonurban soils.
The potential adsorption of Cd, Cu, Cr, Pb, and Zn heavy metals on a ''typical''
mixed brownfield deposit from Scotland (UK) is reported by Markiewicz-Pat-
kowska et al. (
2005
). The urban soil was collected from 15 points within a derelict
area formerly used as a mix of residential and workshop/warehouse activities. The
soil sample had a sandy loam texture and neutral/slightly acid pH. Fragments of
brick, OM, and demolition wastes were clearly visible, suggesting that 10-15 % of
the bulk was of anthropogenic origin. The sorption of heavy metals from single
and multielement solutions, as a function of their initial concentration and pH, is
presented in Fig.
8.54
. It is found that adsorption of Cu from a single-element
solution was over four times greater than adsorption from a multielement solution,
due to competitive effects. In the case of Cr and Zn, release of metal from soil to
solution was observed. The adsorption capacity at pH 2 occurred in the order
Cr [ Cu [ Pb [ Cd, and at pH 7 Cd [ Zn, with precipitation affecting Cu and Pb
