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Copper complexation by natural organic matter (NOM) as related to sample origin
1999 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Copper is a required nutrient but may be toxic to aquatic organisms at elevated concentrations. Organic matter is ubiquitous in the environment and one of the most important copper complexants. It is well documented that organic matter in natural environments affects the transport and fate of copper as well as its toxicity. Despite the large volume of literature available on copper binding by organic matter, it is still unclear how the molecular structure and chemical composition of organic matter affect copper binding. The binding mechanism also remains unsolved. In this work, the dependence of the origin of organic matter samples on copper binding is studied using ion-selective electrode titrations. Potentiometric (pH) titrations and UV-analyses were used to elucidate chemical structures such as acid titrable groups and aromaticity, respectively. Results from attempts to relate copper binding to differences in chemical structure show that copper binding properties are a function of the source of natural organic matter. For the samples studied here copper binding is not related to the concentration of acid titrable groups between pH 3.0 and 10.0. Experiments, however, seemed to exhibit a correlation between percent bound copper and UV adsorption.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Copper complexation, NOM, organic matter, origin
Keyword [sv]
URN: urn:nbn:se:ltu:diva-55729ISRN: LTU-EX--99/245--SELocal ID: c8fbd29d-3b20-44ee-81a0-4ca8f71b3ff2OAI: diva2:1029113
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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