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Stable chlorine isotope analysis of chlorinated acetic acids
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry. (ACESb)ORCID iD: 0000-0003-3096-9405
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Chlorinated acetic acids (CAAs) constitute a group of polar organic compounds that are ubiquitous in the environment. Their environmental occurrence has been extensively studied but their sources are still not well constrained. Isotopic characterization of compounds found in the environment can provide additional information and allow their source apportionment. Previous studies indicate, however, that CAAs of industrial and natural origin may not be distinguishable by stable carbon isotope analysis only. This thesis presents an analytical method for stable chlorine isotope analysis of CAAs using gas chromatography/quadruple mass spectrometry (GC/qMS), for which systems are found in most laboratories. The method was cross-calibrated with an offline reference method and allows the determination of chlorine isotope signatures of CAAs with sample amounts as small as 10 pmol with good precisions of <1 ‰. With this method CAAs can be isotopically characterized at environmental relevant concentrations, in contrast to conventional offline methods were large sample requirements limit the application. This new method enables multi-element stable isotope analysis of CAAs and may help to identify and quantify sources of CAAs to the environment.

Place, publisher, year, edition, pages
Stockholm University, 2016. , 47 p.
Keyword [en]
stable chlorine isotope analysis, chlorinated acetic acids, compound-specific isotope analysis
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-135471OAI: oai:DiVA.org:su-135471DiVA: diva2:1045401
Presentation
2016-12-01, Nordenskiöldsalen, Geovetenskapens hus, Stockholm University, Stockholm, 11:53 (English)
Opponent
Supervisors
Funder
EU, FP7, Seventh Framework Programme, PITN-GA-2010-264329
Available from: 2016-11-15 Created: 2016-11-09 Last updated: 2016-11-15Bibliographically approved
List of papers
1. Stable chlorine isotope analysis of chlorinated acetic acids using gas chromatography/quadrupole mass spectrometry
Open this publication in new window or tab >>Stable chlorine isotope analysis of chlorinated acetic acids using gas chromatography/quadrupole mass spectrometry
2015 (English)In: Rapid Communications in Mass Spectrometry, ISSN 0951-4198, E-ISSN 1097-0231, Vol. 29, no 24, 2341-2348 p.Article in journal (Refereed) Published
Abstract [en]

RationaleThe environmental occurrence of chlorinated acetic acids (CAAs) has been extensively studied, but the sources and transport are still not yet fully understood. A promising approach for source apportionment and process studies is the isotopic characterization of target compounds. We present the first on-line stable chlorine isotope analysis of CAAs by use of gas chromatography/quadrupole mass spectrometry (GC/qMS). MethodsFollowing approved procedures for concentration analysis, CAAs extracted into MTBE were methylated to GC-amenable methyl esters (mCAAs). These mCAAs were then analyzed by GC/qMS for their stable chlorine isotope composition using a sample/standard-bracketing approach (CAA standards in the range Cl-37 -6.3 to -0.2 , Standard Mean Ocean Chloride). ResultsCross-calibration of the herein presented method with off-line reference methods (thermal ionization and continuous-flow GC isotope ratio mass spectrometry; TI-MS and CF-GC/IRMS, respectively) shows good agreement between the methods (regression slope for GC/qMS vs reference method data sets: 0.92 +/- 0.29). Sample amounts as small as 10 pmol Cl can herewith be analyzed with a precision of 0.1 to 0.4 parts per thousand. ConclusionsThis method should be useful for environmental studies of CAAs at ambient concentrations in precipitations (<0.06 to 100nmolL(-1)), surface waters (<0.2 to 5nmolL(-1)) and soil (<0.6 to 2000nmolkg(-1) dry soil) where conventional off-line methods cannot be applied.

National Category
Biological Sciences Chemical Sciences
Identifiers
urn:nbn:se:su:diva-125645 (URN)10.1002/rcm.7407 (DOI)000364876400004 ()26563705 (PubMedID)
Available from: 2016-01-19 Created: 2016-01-15 Last updated: 2016-11-09Bibliographically approved

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Ivansson, Milena Edith
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