Parameter estimation of a plant uptake model for cyanide: application to hydroponic data

International Journal of Phytoremediation
Joseph T BusheyStephen D Ebbs

Abstract

A plant uptake model is applied to describe free cyanide and ferrocyanide transport and fate in willow (Salix eriocephala var. Michaux) grown in hydroponics. The model is applied to experimental data to determine best-fit parameter values, their associated uncertainty, and their relative importance to field-scale phytoremediation applications. The fitted model results, using least-squares optimization of the observed log concentrations, indicate that free cyanide volatilization from leaf tissue and free cyanide cell wall adsorption were negligible. The free cyanide maximum uptake rate and assimilate (noncyanide 15N) first-order leaf loss rate were the only coefficients that significantly affected the model goodness of fit and were concurrently sensitive to data uncertainty in the parameter optimization. Saturation kinetics may be applicable for free cyanide uptake into plants, but not for ferrocyanide uptake, which may occur via preferential protein-mediated or inefficient transpiration stream uptake. Within the free cyanide system, the relative magnitudes of the saturation uptake parameters and the demonstration of an active role for plants in uptake relative to transpiration suggest the potential importance of preferential di...Continue Reading

References

Sep 7, 2002·Environmental Science & Technology·Randy L MaddalenaNorman Y Kado
Oct 25, 2003·Chemosphere·Morten LarsenAlessandro Pirandello
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Apr 18, 2006·International Journal of Phytoremediation·Joseph T BusheyDavid A Dzombak
Nov 1, 1995·Photosynthesis Research·T H Jukes

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Citations

Apr 18, 2006·International Journal of Phytoremediation·Joseph T BusheyDavid A Dzombak
Feb 6, 2008·International Journal of Phytoremediation·Xiao-Zhang YuLiang Chen
Mar 6, 2009·International Journal of Phytoremediation·Stephen D EbbsAlan J M Baker

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Visual Numerics RM

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