Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

2.2K
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
2.2K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

941
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...
941
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.1K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.1K
Sulfur Assimilation01:20

Sulfur Assimilation

228
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
228

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Electron Beam-Degraded β-Glucans from <i>P. ostreatus</i> Retain Their Structure and Biological Activity.

Polymers·2026
Same author

Corrigendum to "Pristine and iron-engineered animal- and plant-derived biochars enhanced bacterial abundance and immobilized arsenic and lead in a contaminated soil" [Sci. Total Environ. (763) 2021, 144218].

The Science of the total environment·2026
Same author

Pervaporation Mixed Matrix Membranes from Sodium Alginate/ZnO for Isopropanol Dehydration.

Molecules (Basel, Switzerland)·2026
Same author

Corrigendum to "Animal carcass- and wood-derived biochars improved nutrient bioavailability, enzyme activity, and plant growth in metal-phthalic acid ester co-contaminated soils: A trial for reclamation and improvement of degraded soils" [J. Environ. Manag. 261 (2020) 110246].

Journal of environmental management·2026
Same author

Nanoplastics in soil and aquatic ecosystems: Sources, impacts, and nature-based remediation strategies.

Environmental pollution (Barking, Essex : 1987)·2026
Same author

Engineered PVA Hydrogel as a Universal Platform for Developing Stable and Sensitive Microbial BOD-Biosensors.

Biosensors·2026

Related Experiment Video

Updated: Dec 12, 2025

Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products
12:55

Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products

Published on: March 18, 2022

19.2K

Trace elements adsorption by natural and chemically modified humic acids.

Leonid Perelomov1, Binoy Sarkar2, David Pinsky3

  • 1Tula State Lev Tolstoy Pedagogical University, Lenin Avenue, 125, Tula, Russia, 300026. perelomov@rambler.ru.

Environmental Geochemistry and Health
|August 8, 2020
PubMed
Summary

Humic acids effectively adsorb toxic metals like lead and copper. Chemical modification of humic acids enhances their capacity for removing potentially toxic trace elements (PTTEs) from the environment.

Keywords:
Humic substancesPersulfate oxidationPotentially toxic trace elementsSorption

More Related Videos

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
08:01

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide

Published on: June 28, 2019

7.8K
Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method
09:43

Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method

Published on: April 11, 2020

7.0K

Related Experiment Videos

Last Updated: Dec 12, 2025

Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products
12:55

Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products

Published on: March 18, 2022

19.2K
Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
08:01

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide

Published on: June 28, 2019

7.8K
Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method
09:43

Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method

Published on: April 11, 2020

7.0K

Area of Science:

  • Environmental Science
  • Geochemistry
  • Materials Science

Background:

  • Humic substances are cost-effective and eco-friendly adsorbents.
  • Potentially toxic trace elements (PTTEs) pose environmental risks.
  • Understanding adsorption mechanisms is crucial for remediation.

Purpose of the Study:

  • To investigate Pb, Zn, Cu, and Ni adsorption by natural and modified humic acids (HAs).
  • To evaluate the impact of potassium persulfate modification on HA adsorption capacity.
  • To elucidate the adsorption mechanisms of PTTEs on HAs.

Main Methods:

  • Batch adsorption experiments were conducted.
  • Humic acids were isolated from lowland peat.
  • Natural and K2S2O8-modified HAs were characterized using 13C NMR spectroscopy.
  • Adsorption data were modeled using the Langmuir isotherm.

Main Results:

  • Natural HAs showed significant adsorption capacities for Pb, Cu, Zn, and Ni.
  • Modification with K2S2O8 increased carboxyl, ketone, and quinoid content in HAs.
  • Modified HAs exhibited enhanced adsorption of Pb (16.3%), Ni (14.2%), Zn (10.6%), and Cu (6.9%).
  • Adsorption was primarily governed by chemisorption and inner-sphere complexation.

Conclusions:

  • Chemically modified humic acids are superior adsorbents for PTTEs.
  • The enhanced adsorption is attributed to increased functional groups after modification.
  • Chemisorption via inner-sphere complexation is the dominant adsorption mechanism.