Complexation of Copper(II) with Humic Acids Studied by Ultrasound Spectrometry

Klučáková, Martina

Complexation of Copper(II) with Humic Acids Studied by Ultrasound Spectrometry

Files

206025.pdf(1.36 MB)

Date

2012-05-14

Authors

Klučáková, Martina

Publisher

Hindawi Publishing Corporation

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Abstract

Copper biogeochemistry is controlled by bonding to natural organic matter. The soluble forms of bonded copper can be more biologically active due to the higher migration in environmental systems and instability of some copper-humic complexes. In this work, the interactions of copper(II) ions with humic acids are studied by means of high-resolution ultrasound spectrometry. It was found that the stoichiometry of the formed complexes is strongly influenced by the organization of humic acid in solution and by the final pH value in equilibrium. Although the ratio between the added copper and humic acids in all used concentrations was constant and the initial pH value was neutral, we observed significant differences between the individual systems. The highest binding ability was determined for a humic content of 0.5 g/dm3.More diluted and more concentrated systems were able to bind lower amounts of copper. The implemented method is very sensitive and can be utilized not only for monitoring copper binding but also as an indicator of conformational changes of humic acid in solutions with varying concentration.
Pomocí vysoce rozlišovací ultrazvukové spektrometrie byla studována komplexace Cu(II) iontů s huminovými kyselinami. Bylo zjištěno, že stechiometrie a prostorové uspořádání vzniklých komplexů silně závisí na pH a počáteční koncentraci huminového roztoku. Významné změny v konformaci a molekulární organizaci byly pozorovány pro roztoky s počteční koncentrací 0,5 - 1 g/dm3.

Keywords

humic acids, complexation, konformace, molekulární organizace, copper, ultrasound spectrometry, huminové kyseliny, komplexace, konformace, molekulární organizace, měď, ultrazvuková spektrometrie

Citation

Organic Chemistry International. 2012, vol. 2012, issue 5, p. 1-6.
https://www.hindawi.com/journals/oci/2012/206025/

Document type

Peer-reviewed

Document version

Published version

Language of document

en