A kinetic approach on the estimation of iron uptake by Apium nodiflorum plants

Abstract

A kinetic approach was developed to indicate the inherent capacity of aquatic plants to absorb heavy metals. The concept was based on the hypothesis that heavy metal uptake by plants follows a first-order mathematical model depending on the heavy metal concentration in the biomass of this plant. This method enabled the evaluation of two parameters: (i) the specific metal uptake rate (k) and (ii) the maximum specific content (E, J of this metal in the aquatic plant. The specific uptake rate coefficient of the metal depended upon the concentration of the metal in the liquid phase, as can be seen from a Michaelis-Menten-type equation. This equation has two constants: (i) a maximum specific metal uptake rate (k max ) and (ii) a K s coefficient. The maximum specific uptake rate coefficient was useful in the evaluation of the ability of different aquatic plants to absorb specific heavy metal, as well as in the evaluation of the selectivity of absorption between two or more metals by 1 Corresponding author. 561 562 VLYSSIDES AND BOURANIS the plant. The maximum specific heavy metal content can be used for quantitative evaluation of an aquatic plant's ability to select this heavy metal. The ability of an aquatic plant to clean its aquatic environment from the metal can be evaluated in terms of the K s -coefficient. An example of this kinetic approach is given by using Apium nodiflorum. Experimental data from an aquatic system of Apium nodiflorum were collected and applied to the proposed kinetic approach for the estimation of parameters E pl,oo k max and K s of the proposed kinetic model, whereas the adequacy of the model was examined by simulating a real process and comparing the predicted and measured values using χ 2 -test.

Potential of citric acid to alter pH and metal uptake in reeds in acid mine drainage solutions

“…The heavy metal uptake process may follow a first‐order mathematical model which depends on the metal levels in the plant biomass, time and metal uptake rate ( k ) (Vlyssides & Bouranis, ). The metal uptake rate ( k ) varies with the plants species, the types and concentration of metals in solutions (Vlyssides & Bouranis ). Further research may be needed to determine different metal (Fe, Al and Mn) uptake rate ( k ) in reeds thus better predict the capacity of CA treated reeds to clean metal contaminated fields.…”

“…Previous research indicated that the metals uptake by plants in solutions was based on the mechanisms that metal diffuse through a membrane towards the bulk phase of the plant because of the concentration gradients present in the membrane (Nigam et al 1998). The heavy metal uptake process may follow a first-order mathematical model which depends on the metal levels in the plant biomass, time and metal uptake rate (k) (Vlyssides & Bouranis, 1998). The metal uptake rate (k) varies with the plants species, the types and concentration of metals in solutions (Vlyssides & Bouranis 1998).…”

Kinetics of Manganese Uptake by Wetland Plants

“…The approach used in this study is based on a first order kinetic model and depends on the heavy metal concentration in the biomass of the plant. This method enables the evaluation of the specific metal uptake rate and the maximum specific content of the metal in the plant [27] .…”

Kinetics of Iron Uptake by Wetland Plants

“…The approach used in this study is based on a first order kinetic model and depends on the heavy metal concentration in the biomass of the plant. This method enables the evaluation of the specific metal uptake rate and the maximum specific content of the metal in the plant [21] .…”

“…The uptake of dissolved Fe by an aquatic plant at given conditions (pH and temperature) can be expressed as a function of the maximum concentration of Fe that can be accumulated in the plant tissue and the specific uptake rate using the following first-order kinetic model [21] :…”