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Updated: Jul 12, 2026

An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium

An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium

Published on: December 17, 2018

Cadmium bioavailability and speciation using the permeation liquid membrane.

Stéphane Bayen¹, Isabelle Worms, Nalini Parthasarathy

¹CABE, University of Geneva, Sciences II, 30 Quai Ernest Ansermet, CH 1211, Geneva 4, Switzerland. stephane.bayen@cabe.unige.ch

Analytica Chimica Acta

|August 29, 2007

Summary

The permeation liquid membrane (PLM) technique accurately measures free cadmium (Cd) in freshwater, aiding in understanding its bioavailability to aquatic organisms like algae. This method shows promise for predicting how much cadmium is taken up by living cells.

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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

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Last Updated: Jul 12, 2026

An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium

An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium

Published on: December 17, 2018

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

Published on: November 9, 2015

Area of Science:

Environmental Chemistry
Aquatic Toxicology
Analytical Chemistry

Background:

Cadmium (Cd) speciation in natural waters is complex due to various ligands.
Accurate measurement of free Cd2+ is crucial for assessing its environmental risk and bioavailability.
Existing methods for Cd speciation may have limitations in complex natural matrices.

Purpose of the Study:

To evaluate the permeation liquid membrane (PLM) technique for determining cadmium speciation in freshwater media.
To compare PLM measurements of free Cd with theoretical calculations and selective electrode data.
To assess the utility of PLM as a predictor of cadmium bioavailability to freshwater algae.

Main Methods:

Characterization of a planar sheet PLM system by measuring Cd fluxes with and without complexing agents (citrate, malonate, NTA, humic acid).
Comparison of PLM results with theoretical speciation calculations and Cd2+ selective electrode measurements.
Investigation of pH and co-transported ion effects on Cd transport through PLM.
Evaluation of hollow-fiber PLM (HFPLM) for measuring nanomolar free Cd.
Comparison of Cd PLM fluxes with Cd biouptake (internalization flux) in Chlorella kesslerii.

Main Results:

The planar sheet PLM accurately measured free Cd within the 10(-8) to 10(-4) M concentration range.
PLM measurements correlated well with theoretical speciation and selective electrode data.
The effect of pH and co-transported ions on Cd transport was elucidated.
HFPLM demonstrated capability for measuring nM range free Cd.
Cd PLM fluxes showed a relationship with Cd biouptake in Chlorella kesslerii, especially in the presence of humic acid.

Conclusions:

The permeation liquid membrane technique is a reliable method for quantifying free cadmium in freshwater environments.
PLM offers a valuable tool for understanding cadmium speciation and its influence on bioavailability.
PLM measurements can serve as a predictive indicator of cadmium uptake by aquatic organisms, improving ecological risk assessments.