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Dynamic headspace: a single‐step extraction for isotopic analysis of μg/L concentrations of dissolved chlorinated ethenes
Author(s) -
Morrill Penny L.,
LacrampeCouloume Georges,
Lollar Barbara Sherwood
Publication year - 2004
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1372
Subject(s) - chemistry , extraction (chemistry) , chromatography , environmental chemistry
In this study a dynamic headspace method was developed to measure the carbon isotope values of dissolved chlorinated ethenes at μg/L concentrations. A gas chromatograph/combustion/isotope ratio mass spectrometer (GC/C/IRMS) was modified to include a headspace extraction system followed by a cryogenic trap. Extracting headspace from a 160 mL vial with 80 mL of aqueous solution and 40 g of NaCl for 8–12 min resulted in accurate and reproducible δ 13 C values for trichloroethene (TCE) and cis‐1,2‐dichloroethene (cDCE) at concentrations of 50–75 μg/L. Based on these results a conservative lower limit of quantitation of 38 μg/L can be calculated for these compounds. For more volatile compounds such as tetrachloroethene (PCE) and vinyl chloride (VC), field data analyzed using this method indicate a lower limit of quantitation in the tens of μg /L range. Copyright © 2004 John Wiley & Sons, Ltd.