The effect of Phosphate Rock on Arsenic uptake in a multi-metal system. (S11-fayiga409708-poster)
Authors:
A.O. Fayiga* - Univ of Florida L.Q. Ma - Univ of Florida
Abstract:
The effects of phosphate rock on arsenic and metal uptake by the arsenic hyperaccumulating Chinese Brake fern (P. vittata), in the presence of Cd, Pb and Zn, were examined in a greenhouse experiment.
Five treatments were used, including 1) control with no arsenic, 2) spiked with 50 ppm As, 3) spiked with 50 ppm As and 50 ppm P as rock phosphate (AsP), 4) spiked with 50 ppm As, 50ppm Pb, Cd, and Zn (AsM), 5) spiked with 50 ppm As, 50 ppm Pb, Cd, and Zn, 50 ppm P as rock phosphate (AsMP). Chinese brake fern was able to grow in a soil spiked with cadmium, zinc and lead at 50 mg kg-1. Phosphate rock increased both arsenic and calcium availability in the soil. Phosphate rock significantly increased arsenic uptake and reduced lead uptake by Chinese brake fern in the multi-metal system. Arsenic uptake by the fern was positively correlated with both total and available arsenic in the soil. Phosphorus uptake was significantly lower in the arsenic treated soils whereas Ca uptake was significantly higher in arsenic treated soils. Phosphate rock facilitated arsenic uptake in the multi-metal system showing that it can be used in the phytoremediation of arsenic-metal polluted soils as a cost-effective soil amendment.
Speaker Information: Abioye Fayiga, Univ of Florida, Soil and Water Science Department University of F, Gainesville, FL 32608; Phone: (352)-392-1951; E-mail: [email protected]
Session Information: Wednesday, November 5, 2003, 4:00 PM-6:00 PM Presentation Start: 4:00 PM (Poster Board Number: 1514)
Keywords: Phosphate rock; arsenic uptake; metals; phytoremediation