Abstract

ALVAREZ VILLANUEVA, Felipe Carlos et al. Cd phytoavailability in sewage sludge-amended soil of different pH estimated by an isotopic method and chemical extraction. Quím. Nova [online]. 2008, vol.31, n.5, pp. 1020-1026. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422008000500014.

The Cd phytoavailability in sewage sludge-amended soils of different pHs using the ¹⁰⁹Cd L-value isotopic method and Cd extracted by DTPA has been determined. Maize plants (Zea mais L.) were grown under greenhouse conditions in a xanthic ferralsol at different pHs amended with five sewage sludge (SS) rates, and labeled with 74 kBq kg^-1 of ¹⁰⁹Cd. The SS rates altered the properties of the soil chemicals and these influenced the isotopic parameter (L-value) and percent of Cd uptake by plants from soil (%Cdpdfs) and SS (%CdpdfSS). L-values and Cd extracted by DTPA correlate significantly with SS rates and Cd uptake by plants and are efficient for predicting the Cd phytoavailability in the sewage sludge-amended soil.

Keywords : cadmium; L-value; sewage sludge.