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Layered Alginate Constructs: A Platform for Co-culture of Heterogeneous Cell Populations

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Published on: August 7, 2016

Cd(II) speciation in alginate gels.

Thomas A Davis¹, Erwin J J Kalis, Jose Paulo Pinheiro

¹Laboratory of Physical Chemistry and Colloid Science, Wageningen University, P.O. Box 8038, 6700 EK Wageningen, The Netherlands. ta.davis@umontreal.ca

Environmental Science & Technology

|October 23, 2008

Summary

This study reveals how alginate gels influence cadmium speciation. Specific binding significantly enhances total cadmium levels, impacting metal biouptake in natural systems.

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Area of Science:

Environmental Chemistry
Biogeochemistry
Materials Science

Background:

Polysaccharides in cell walls and biofilms are crucial for metal speciation in aquatic environments.
Alginate gels, formed by calcium bridging, serve as a model for biogels.

Purpose of the Study:

To investigate the speciation of Cadmium(II) (Cd(II)) within alginate gel matrices.
To understand the interplay of electrostatic and specific binding on metal ion behavior in biogels.

Main Methods:

Utilized a novel in situ microelectrode voltammetric technique to measure free Cd2+ concentration.
Employed potentiometric titration and total metal ion determination (Ca(II) and Cd(II)).
Reconstructed the gel's charged environment and cation binding properties.

Main Results:

Accurately predicted Donnan potential (psiD) and enrichment coefficient (piD) using multiple measurement and modeling approaches.
Observed a 3-fold enhancement of free Cd2+ in the gel phase relative to the bulk solution at 10 mM ionic strength.
Found a 60-fold enhancement in total Cd(II) due to specific binding by alginate's uronic acids.

Conclusions:

Demonstrated that combined specific and electrostatic binding significantly alters Cd(II) speciation in charged biological gels.
Highlighted the importance of speciation analysis for understanding metal biouptake in complex environmental media.