|SREL Reprint #2233|
Influence of zeolite, apatite and Fe-oxide on Cd and Pb uptake by crops
A. Chlopecka, D.C. Adriano
University of Georgia, Savannah River Ecology Laboratory, Drawer E, Aiken, SC 29802, USA
Received 1 September 1997; accepted 9 September 1997
Natural zeolite (clinoptilotite), hydroxyapatite and an iron-oxide waste by-product (Fe-richTm, a trademark name of E.I. du Pont de Nemours) were added to an artificially contaminated Appling soil to immobilize and limit the uptake of metals by crops. A greenhouse pot study employed spiking the soil with Cd and Ph from metal flue dust. Maize (Zea mays) and barley (Hordeum vulgare) were planted in 7-kg potted soil to determine the effects of Cd and Ph on plant growth and uptake. Sequential extraction of soil indicates the substantial influence of soil pH and type of ameliorant on the chemical form and bioavailability of the metals. Data indicates that a dose of 50 g/kg of soil of iron-oxide appears to be very effective, based on the yields, metal contents of plant tissues and available forms of Cd and Ph in the soil. Lower doses of zeolite and apatite (15 g/kg and 4 g/kg soil, respectively) in most cases also reduced significantly the uptake of Cd and Ph by crops.
Keywords: Cadmium; Lead; Zeolite; Apatite; Fe-rich
SREL Reprint #2233
Chlopecka, A. and D.C. Adriano. 1997. Influence of zeolite, apatite and Fe-oxide on Cd and Pb uptake by crops. The Science of the Total Environment 207:195-206.