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Dissolved organic carbon quality and sorption of organic pollutants in the Baltic Sea in light of future climate change
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Medicine, Department of Pharmacology and Clinical Neuroscience.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2015 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 49, no 3, 1445-1452 p.Article in journal (Refereed) Published
Abstract [en]

Regional climate change scenarios predict increased temperature and precipitation in the northern Baltic Sea, leading to a greater runoff of fresh water and terrestrial dissolved organic carbon (DOC) within the second part of the 21st century. As a result, the current north to south gradient in temperature and salinity is likely to be shifted further toward the south. To examine if such climate change effects would cause alterations in the environmental fate of organic pollutants, spatial variations of DOC quality and sorption behavior toward organic contaminants were examined using multiple analytical methods. The results showed declining contents of aromatic functional groups in DOC along a north to south gradient. Similarly, the sorption of a diverse set of organic contaminants to DOC also showed spatial differences. The sorption behavior of these contaminants was modeled using poly parameter linear energy relationships. The resulting molecular descriptors indicated clear differences in the sorption properties of DOC sampled in northern and southern parts of the Baltic Sea, which imply that more organic contaminants are sorbed to DOC in the northern part. The extent of this sorption process determines whether individual contaminants will partition to biota via direct uptake or through sorption to DOC, which serves as food source for bacteria-based food-webs.

Place, publisher, year, edition, pages
2015. Vol. 49, no 3, 1445-1452 p.
National Category
Chemical Sciences Environmental Sciences
URN: urn:nbn:se:umu:diva-98929DOI: 10.1021/es504437sISI: 000349060300026OAI: diva2:784199
Available from: 2015-01-28 Created: 2015-01-28 Last updated: 2015-06-24Bibliographically approved
In thesis
1. Bioavailability of organic contaminants in a changing climate
Open this publication in new window or tab >>Bioavailability of organic contaminants in a changing climate
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The effects of predicted future climate change was investigated with special emphasis on the association of organic contaminants with dissolved organic carbon (DOC) in the Baltic Sea.

An automated method was developed for the measurements of DOC - water distribution constants at realistic DOC concentrations in brackish water. The method proved to be valid for 30 organic contaminants with different structural elements in the 5 – 100 mg car bon/L DOC concentration range. There were limitations of this method. Firstly, its applicability is limited towards contaminants with lower affinity to DOC. Secondly, at higher (>100 mg carbon/L) DOC concentrations the sorption of contaminants was underest imated.

Afterwards, water samples were collected from 15 points within the Baltic Sea in a north - south gradient t o examine the spatial differences in DOC characteristics and sorption properties . The DOC samples were analyzed using proton nuclear magnetic resonance and ultraviolet spectroscopy. Results from both techniques indicated that the aromatic nature of the DOC pool increased towards the northern Baltic Sea. This was expected as the freshwater inflow has high significance in controlling the hydrograp hic conditions in the Bothnian Bay. Sorption of organic contaminants was subsequently measured in the same samples. The results showed decreased sorption from north to south for hydrophobic contaminants such as chlorinated benzenes but for contaminants lik e tributyl - phosphate no spatial tendencies were observed. The data generated was used to determine molecular descriptors of DOC using linear free energy relationships. The results indicated a higher significance of hy drogen bond donor/acceptor functional g roups of the DOC in the south.

Changes in contaminant distribution were simulated in model pelagic ecosystems at possible endpoints predicted by future climate change scenarios. Separate and combined effects of temperature a nd DOC were studied in mesocosms. The results indicated interesting tendencies. Increased temperature resulted in increased losses in the amounts of organic contaminants. Increased DOC levels promoted sedimentation and sorption of contaminants to particulate matter and biota. Hi gher amounts of contaminants were retained. The combined effects of the two factors led to and overall decrease in dissolved amounts. Higher losses or increased sedimentation and sorption to particles were also observed depending on contaminant properties.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2015. 82 p.
climate change, organic contaminants, sorption, dissolved organic carbon, bioavailability
National Category
Analytical Chemistry Environmental Sciences
urn:nbn:se:umu:diva-98828 (URN)978-91-7601-220-8 (ISBN)
Public defence
2015-02-20, Södra Hörsalen, KBC Huset, Umeå, 10:00 (English)
Available from: 2015-01-30 Created: 2015-01-27 Last updated: 2015-02-02Bibliographically approved

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Ripszam, MatyasPaczkowska, JoannaFigueira, JoãoVeenaas, CathrinHaglund, Peter
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