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In situ degradation of monoethyl-, diethyl phthalate and o-phthalic acid in a landfil leachate plume (Grindsted, Denmark)
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Environment & Resources DTU, Technical University of Denmark, Denmark.
Environment & Resources DTU, Technical University of Denmark, Denmark.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The distribution of a-phthalic acid and ten of its mono- and diesters in the leachate plume downgradient of an unlined landfill (Grindsted, Denmark) was mapped along an 80 m transect. A total of 27 groundwater samples were concentrated by solid-phase extraction (SPE) using a polystyrene divinylbenzene (PS-DVB) polymer. Elevated concentrations of DEP, MEP and phthalic acid were observed, with maxima of 1260, 231 and 51 µg/L, respectively. Generally, high concentrations were observed close to the landfill border and in the lower parts of the aquifer. At a distance of 50m from the landfill border, the concentrations of all the studied phthalates, including DEP, MEP and PA, had decreased to below the detection limits (1 µg/L ). The presence of the specific metabolite MEP and PA, at the landfill border and in the plume, indicates that in situ anaerobic degradation/transformation of DEP occurred both in and beneath the landfill, as well as in the leachate-contarninated soil profile. Our findings suggest that anaerobic degradation is a key process also in the aquifer at the Grindsted landfill site. Tills study emphasises that phthalates should be regarded as potential contaminants in aquifers.

Keyword [en]
diethyl phthalate, monoethyl phthalate, phthalic acid, redox, biotic degradation
National Category
Social Sciences Interdisciplinary
Identifiers
URN: urn:nbn:se:liu:diva-80183OAI: oai:DiVA.org:liu-80183DiVA: diva2:546072
Available from: 2012-08-22 Created: 2012-08-22 Last updated: 2012-08-22Bibliographically approved
In thesis
1. Phthalates in landfill leachates: a signature of their degradation: Analytical aspects & toxicological considerations
Open this publication in new window or tab >>Phthalates in landfill leachates: a signature of their degradation: Analytical aspects & toxicological considerations
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Phthalic acid diesters comprise a large group of organic compounds that are used to manufacture a variety of products all over the world, and this has raised concerns about the fate of these compounds in the environment. The diester-containing products often end up in landfills, where they are degraded by various micro-organisms, which gives rise to transient intermediates such as phthalic acid monoesters and ortho-phthalic acid. These degradation products escape detection when applying the analytical protocols used to investigate the well-elucidated diesters, hence other methods are needed.

In the present work, the temporal pattern of degradation was scrutinised by studying leachates from both laboratory-scale Iandfill simulation reactors and newly established fullscale landfill cells. Leachate samples from a transect downstream of a landfill were also examined to highlight possible groundwater contamination from unlined landfills. In addition, extraction techniques were developed for simultaneous detection of diesters, monoesters of o-phthalic acid, and o-phthalic acid itself.

The degradation products of phthalate diesters (i.e. the monoesters and phthalic acid) were found in the landfill leachates, which demonstrates proves that phthalic acid diesters are degraded/transformed in situ in landfills. The monoesters and phthalic acid may accumulate in leachates during certain parts of landfill degradation development, for example, during establishment of the methanogenic micro-flora. The phthalates leached from landfills are potential groundwater contaminants, whereas breakdown of the diesters and monoesters was observed in the studied Iandfill plume. The monoesters and phthalic acid could be detected by proper acidification of the samples and derivatization of the extracts, followed by gas chromatography and mass spectrometry. Acute toxicity tests showed that the monoesters were generally less toxic than the corresponding diesters, and that phthalic acid was the least toxic. These results suggest that degradation of the diesters to monoesters and phthalic acidwill reduce the risk for acute toxic effects on the environment.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2003. 66 p.
Series
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 268
National Category
Social Sciences Interdisciplinary
Identifiers
urn:nbn:se:liu:diva-29573 (URN)14948 (Local ID)91-7373-588-4 (ISBN)14948 (Archive number)14948 (OAI)
Public defence
2003-01-31, Sal Elysion, Hus-T, Universitetssjukhuset, Linköping, 10:00 (Swedish)
Supervisors
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2014-09-01Bibliographically approved

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Jonsson, SusanneSvensson, Bo H.

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