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Chloro- and bromoacetates in natural archives of firn from Antarctica
Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Mathematics, Statistics .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Organic Analytical Chemistry .
2000 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 34, no 2, 239-245 p.Article in journal (Refereed) Published
Abstract [en]

A firn core was drilled in Dronning Maud Land, Antarctica, to investigate the presence of haloacetates in snow that had accumulated over the past 200 years. By employing GC-MS detection of methyl esters of haloacetic acids, we were able to measure haloacetate concentrations down to one or a few nanograms per liter. Trichloroacetate (TCA) and dibromoacetate (DBA) were found in firn at concentrations that clearly exceeded the blank level of the applied analytical procedure, with mean concentrations estimated to 12 and 6 ng/L, respectively. There were also indications that mono- and dichloroacetate (MCA and DCA) were present in firn, whereas monobromoacetate (MBA) was found only in samples of surficial snow. We concluded that there is a significant natural background level of TCA and DBA in precipitation based on the following: (i) several of samples represented snow accumulated in the 19th century, (ii) haloacetates can be expected to be immobile in Antarctic firn, (iii) extensive measures were taken to prevent sample contamination, and (iv) blank levels of the analytical procedure used were low and stable. In addition, our results suggested that MCA and DCA also occur naturally in precipitation.

Place, publisher, year, edition, pages
2000. Vol. 34, no 2, 239-245 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47707DOI: 10.1021/es9812150OAI: oai:DiVA.org:liu-47707DiVA: diva2:268603
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Grimvall, AndersBorén, Hans

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