Abstract
The goal of this work was to study quantitatively lead bioaccumulation from a lead-doped nutrient medium by using a living aquatic macrophytes Pistia stratiotes. Several sets of aquatic plants with approximately 30 g weight were grown in greenhouse conditions and in hydroponic solutions supplied with a non-toxic Pb2+ concentration. The synchrotron radiation total X-ray fluorescence spectrometry was used to determine the metal concentrations in dry plants and hydroponic media as a function of time. Four different non-structural bioaccumulation models were applied to describe the process dynamics and to estimate the accumulated lead maximum capacity and rate constants. According to the experimental data, both biosorption and bioaccumulation mechanisms can be considered. Due to the low desorption rate constant, the experimental data were well described by the irreversible kinetic model. The results concerning modeling of living macrophytes’ metal bioaccumulation kinetics can be used to predict the heavy metal removal dynamics from wastewaters in artificial wetlands.
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Acknowledgment
We gratefully acknowledge The Brazilian Light Synchrotron Laboratory (LNLS) for partial financial support of this study through the 6718 project.
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Espinoza-Quiñones, F.R., Módenes, A.N., Costa, I.L. et al. Kinetics of Lead Bioaccumulation from a Hydroponic Medium by Aquatic Macrophytes Pistia stratiotes . Water Air Soil Pollut 203, 29–37 (2009). https://doi.org/10.1007/s11270-009-9989-8
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DOI: https://doi.org/10.1007/s11270-009-9989-8