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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...

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Modelling the Plant Uptake of Metals from Release Rates Obtained by the EUF Method.

Manfred Sager¹

¹Bioforschung Austria, Esslinger Hauptstrasse 134, A-1220 Vienna, Austria.

Plants (Basel, Switzerland)

|January 11, 2022

Summary

This study models soil dissolution kinetics using electro-ultrafiltration to predict metal uptake in lettuce. Soil dissolution parameters correlated with plant metal absorption, aiding in understanding metal bioavailability.

Keywords:

EUF lettuce metal uptake soil dissolution kinetics

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Area of Science:

Environmental Science
Soil Science
Plant Nutrition

Background:

Predicting metal uptake in plants is crucial for food safety and environmental monitoring.
Soil properties significantly influence metal bioavailability and plant absorption.
Understanding soil dissolution kinetics provides insights into metal release mechanisms.

Purpose of the Study:

To evaluate soil dissolution kinetics for predicting metal uptake in lettuce.
To model the time-dependent release of metals from soils under varying conditions.
To correlate soil kinetic parameters with metal absorption by lettuce plants.

Main Methods:

Electro-ultrafiltration (EUF) was used to determine soil dissolution velocities and time dependencies.
Three kinetic models were applied to soil suspensions in DTPA at specific pH levels.
Pot experiments were conducted with lettuce grown on different soil samples (original, fertilized, metal-spiked).

Main Results:

Kinetic models provided parameters like maximum achievable concentration and timespan for metal release.
Fairly good correlations were observed between kinetic parameters and plant uptake of Zn, Li, Sr, Ni, and Pb.
Metal uptake correlations were stronger when metallic salt solutions were added to the soil.

Conclusions:

Soil dissolution kinetics, particularly when modeled with EUF, can predict metal uptake in plants.
The study highlights the importance of considering soil properties and metal speciation in bioavailability assessments.
Plant growth was minimally affected, suggesting tolerance or adaptation mechanisms.