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Title: Chloro- and bromoacetates in natural archives of firn from Antarctica

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, the authors 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. The authors 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, their results suggested that MCA and DCA also occur naturally in precipitation.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
20014593
Resource Type:
Journal Article
Resource Relation:
Journal Name: Environmental Science and Technology; Journal Volume: 34; Journal Issue: 2; Other Information: PBD: 15 Jan 2000
Research Org:
Linkoeping Univ. (SE)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ANTARCTICA; SNOW; ACETATES; ORGANIC CHLORINE COMPOUNDS; ORGANIC BROMINE COMPOUNDS; ECOLOGICAL CONCENTRATION