Mineral materials as feasible amendments to stabilize heavy metalsin polluted urban soils
Mingkui Zhang , Jincheng Pu
DOI:
Received May 11, 2010,Revised October 11, 2010, Accepted , Available online
Volume 23,2011,Pages 607-615
- Summary
- References
- Related Articles
Four minerals, agricultural limestone (AL), rock phosphate (RP), palygorskite (PG), and calcium magnesium phosphate (CMP),
were evaluated by means of chemical fractions of heavy metals in soils and concentrations of heavy metals in leachates from columns
to determine their ability to stabilize heavy metals in polluted urban soils. Two urban soils (calcareous soil and acidic soil) polluted
with cadmium, copper, zinc and lead were selected and amended in the laboratory with the mineral materials) for 12 months. Results
indicated that application of the mineral materials reduced exchangeable metals in the sequence of Pb, Cd > Cu > Zn. The reduction of
exchangeable fraction of heavy metals in the soils amended with di erent mineral materials followed the sequence of CMP, PG > AL
> RP. Reductions of heavy metals leached were based on comparison with cumulative totals of heavy metals eluted through 12 pore
volumes from an untreated soil. The reductions of the metals eluted from the calcareous soil amended with the RP, AL, PG and CMP
were 1.98%, 38.89%, 64.81% and 75.93% for Cd, 8.51%, 40.42%, 60.64% and 55.32% for Cu, 1.76%, 52.94%, 70.00% and 74.12%
for Pb, and 28.42%, 52.74%, 64.38% and 49.66% for Zn. Those from the acidic soil amended with the CMP, PG, AL, and RP were
25.65%, 68.06%, 78.01% and 79.06% for Cd, 26.56%, 49.64%, 43.40% and 34.68% for Cu, 44.44%, 33.32%, 61.11% and 69.44%
for Pb, and 18.46%, 43.77%, 41.98% and 40.68% for Zn. The CMP and PG treatments were superior to the AL and RP for stabilizing
heavy metals in the polluted urban soils.
