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Extraction: Advanced Methods

Extraction: Advanced Methods

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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Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements

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Towards practical cadmium phytoextraction with Noccaea caerulescens.

R W Simmons¹, R L Chaney, J S Angle

¹a Department of Agri-Food , Cranfield University , Cranfield , Bedfordshire , United Kingdom.

International Journal of Phytoremediation

|November 1, 2014

Summary

Noccaea caerulescens from France shows potential for phytoextraction of cadmium (Cd) and zinc (Zn) in Thailand. Optimizing soil pH, planting density, and crop duration can enhance metal removal from rice paddy soils.

Keywords:

Noccaea caerulescens Thailand cadmium phytoextraction zinc

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Area of Science:

Environmental Science
Biotechnology
Agronomy

Background:

Localized cadmium (Cd) and zinc (Zn) contamination poses environmental risks.
Phytoextraction using hyperaccumulators is a sustainable remediation strategy.
Noccaea caerulescens is a known hyperaccumulator with potential for phytoremediation.

Purpose of the Study:

To evaluate the phytoextraction potential of Noccaea caerulescens populations from southern France in Thailand.
To investigate the effects of soil pH, fertilization, and fungicide application on metal uptake.
To determine optimal conditions for Cd and Zn removal from contaminated rice paddy soils.

Main Methods:

Field trials were conducted with N. caerulescens populations transplanted into contaminated Thai soils.
Soil treatments included variations in pH, fertilization, and fungicide application.
Plant biomass, shoot/root Cd and Zn concentrations, translocation factors, and bioaccumulation factors were measured.

Main Results:

Shoot biomass ranged from 280-650 kg ha(-1) DW.
Shoot Cd and Zn concentrations reached 460-600 mg kg(-1) and 2600-2900 mg kg(-1) DW, respectively.
Cadmium and Zn translocation factors ranged from 0.91-1.0 and 1.7-2.1, with bioaccumulation factors of 12-15 and 1.2-1.3.

Conclusions:

Noccaea caerulescens demonstrates significant potential for phytoextracting Cd and Zn from Thai rice paddy soils.
Optimizing fungicidal sprays, acidic soil pH, planting density, and cropping period can enhance metal removal rates.
Practical Cd and Zn phytoextraction from rice paddy soils in Thailand is feasible with optimized management strategies.