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 Experiment Videos

Copper complexation by tannic acid in aqueous solution.

Peter Kraal1, Boris Jansen, Klaas G J Nierop

  • 1Institute for Biodiversity and Ecosystem Dynamics - Earth Surface Processes and Materials (IBED-ESPM), Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands. peerkema@yahoo.com

Chemosphere
|July 14, 2006
PubMed
Summary

Copper speciation in tannic acid solutions shows insoluble organic copper complexes dominate initially. At higher copper concentrations, copper-catalyzed degradation increases free copper and soluble complexes.

Related Concept Videos

You might also read

Related Articles

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

Sort by
Same author

Influence of a bio-based fertilizer on pharmaceuticals uptake by wheatgrass in soil.

Ecotoxicology and environmental safety·2025
Same author

Understanding the influence of bio-based fertilizers (BBFs) on sorption of pharmaceuticals in soils: Effects of pH and organic matter.

Environmental research·2025
Same author

Fungal-mediated soil aggregation as a mechanism for carbon stabilization.

The ISME journal·2025
Same author

A systematic review of the methodology of trade-off analysis in agriculture.

Nature food·2024
Same author

Green Additives in Chitosan-Based Bioplastic Films: Physical, Mechanical, and Chemical Properties.

ChemSusChem·2023
Same author

Simultaneous detection of pesticides and pharmaceuticals in three types of bio-based fertilizers by an improved QuEChERS method coupled with UHPLC-q-ToF-MS/MS.

Journal of hazardous materials·2023

Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Geochemistry

Background:

  • Tannic acid (TA) is a common organic matter in natural waters.
  • Understanding copper (Cu) speciation is crucial for assessing its environmental fate and toxicity.
  • Titration experiments help elucidate metal-ligand interactions and complexation.

Purpose of the Study:

  • To investigate the speciation of copper in dissolved tannic acid solutions.
  • To quantify the distribution of soluble and insoluble copper species under varying copper-to-organic carbon ratios.
  • To characterize the properties of labile soluble copper complexes.

Main Methods:

  • A nine-step titration experiment was performed with varying Cu/OC molar ratios.
  • Copper species were separated into soluble and insoluble fractions using 0.45 µm filtration.

Related Experiment Videos

  • Copper ion-selective electrode (ISE) and diffusive gradients in thin films (DGT) were used to measure free Cu(II) and labile soluble Cu complexes.

    • Main Results:

    • Insoluble organic copper complexes were the dominant species, reaching up to 96% of total copper.
    • Above a Cu/OC molar ratio of 0.0100, copper-catalyzed aggregate degradation increased free Cu and labile soluble complexes to 28% and 32%, respectively.
    • Labile soluble copper complexes exhibited relatively high diffusion coefficients in APA hydrogel.

    Conclusions:

    • Copper speciation in tannic acid solutions is highly dependent on the Cu/OC ratio.
    • Copper-induced degradation of organic aggregates plays a significant role in releasing soluble copper species.
    • The characterization of labile soluble copper complexes provides insights into their mobility and bioavailability.