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Elimination of interferences caused by simultaneous use of deuterated and carbon-13 standards in GC-MS analysis of polycyclic aromatic hydrocarbons (PAHs) in extracts from passive sampling devices
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2013 (English)In: Analytical Methods, ISSN 1759-9660, Vol. 5, no 12, 2925-2928 p.Article in journal (Refereed) Published
Abstract [en]

Two types of isotope-labelled reference compounds are typically used for the passive sampling of polycyclic aromatic hydrocarbons. One type is added before the exposure of the sampler and is called a performance reference compound (PRC). The other is the laboratory internal standard, which is spiked into the sample after extraction (dialysis) from the membrane and is used for quantification. Generally, PRCs are deuterium-labelled while internal standards are C-13-labelled. Interference originating from the internal standards occurs when the molecular ions of the PRCs gradually lose deuterium in the ion source to generate fragments that overlap with the molecular ions of the C-13-labelled internal standards. This can cause significant systematic errors in quantification. Gas chromatography-high resolution time-of-flight mass spectrometry (GC-HRTOF-MS) was used to investigate the degree of interference at varying virtual resolutions of the MS instrument, and it was shown that many of the spectral interferences can be avoided by using high MS resolutions (35 000 or better).

Place, publisher, year, edition, pages
2013. Vol. 5, no 12, 2925-2928 p.
National Category
Analytical Chemistry
URN: urn:nbn:se:umu:diva-76820DOI: 10.1039/c3ay40419fISI: 000319819000003OAI: diva2:636986
Available from: 2013-07-15 Created: 2013-07-15 Last updated: 2015-01-28Bibliographically 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, MatyasHaglund, Peter
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