Related Experiment Video
Updated: Aug 7, 2026
09:33
An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
Published on: December 17, 2018
Cadmium and chromium removal kinetics from solution by two aquatic macrophytes
N Suñe1, G Sánchez, S Caffaratti
1Química Analítica--Facultad de Ingeniería Química, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), U.N.L. Sgo del Estero 2829, 3000 Santa Fe, Argentina.
Environmental Pollution (Barking, Essex : 1987)
|July 4, 2006
Summary
Salvinia herzogii and Pistia stratiotes exhibit distinct chromium and cadmium bioaccumulation. Cd uptake is species-specific, while Cr uptake relies on adsorption and ion exchange in both plants.
Area of Science:
- Environmental Science
- Plant Biology
- Water Treatment Technologies
Background:
- Free-floating macrophytes like Salvinia herzogii and Pistia stratiotes are utilized in wetland systems for water purification.
- Understanding the mechanisms of chromium (Cr) and cadmium (Cd) bioaccumulation in these plants is crucial for optimizing water treatment efficacy.
Purpose of the Study:
- To investigate and differentiate the bioaccumulation processes of chromium and cadmium in Salvinia herzogii and Pistia stratiotes.
- To elucidate the specific mechanisms (e.g., biological uptake, adsorption, chelation, ion exchange) driving metal accumulation in each species.
Main Methods:
- Comparative analysis of Cr and Cd uptake kinetics in S. herzogii and P. stratiotes under controlled conditions.
- Distinguishing between fast and slow stages of metal accumulation to identify dominant processes.
- Analyzing species-specific differences in metal uptake pathways, including root-induced precipitation and foliar uptake.
Main Results:
- Cadmium uptake showed significant species-specific differences in the fast stage, whereas chromium uptake did not.
- Biological processes were dominant for Cd uptake in S. herzogii, while adsorption, chelation, and ion exchange were key for P. stratiotes.
- Adsorption, chelation, and ion exchange were the primary mechanisms for Cr uptake in both species.
- Root-induced Cr precipitation was observed in P. stratiotes, and foliar uptake likely contributed to Cr accumulation in S. herzogii's aerial parts.
Conclusions:
- The two macrophytes employ different primary mechanisms for accumulating cadmium and chromium.
- Salvinia herzogii primarily utilizes biological uptake for cadmium, while Pistia stratiotes relies on physicochemical processes.
- Chromium accumulation in both species is mainly driven by adsorption, chelation, and ion exchange, with species-specific secondary mechanisms influencing overall uptake.
Related Concept Videos
00:56Extraction: 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 formed in...
01:25Microbial Bioremediation of Uranium
Microorganisms play a critical role in the transformation and immobilization of uranium in contaminated environments through four main pathways: bioreduction, biosorption, bioaccumulation, and biomineralization. These mechanisms reduce uranium’s toxicity and prevent its migration through groundwater systems, offering sustainable approaches for in situ bioremediation.Bioreduction of UraniumBioreduction is driven by anaerobic bacteria such as certain strains of Geobacter and Shewanella, which use...
00:46Bioremediation
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
01:27Microbial Leaching
Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
01:26Microbial Bioremediation of Hydrocarbons
Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...