A high volume sampling system for isotope determination of volatile halocarbons and hydrocarbons
The isotopic composition of volatile organic compounds (VOCs) can provide valuable information on their sources and fate not deducible from mixing ratios alone. In particular the reported carbon stable isotope ratios of chloromethane and bromomethane from different sources cover a δ&am...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2011-10-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/4/2073/2011/amt-4-2073-2011.pdf |
| _version_ | 1818209467301363712 |
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| author | E. Bahlmann I. Weinberg R. Seifert C. Tubbesing W. Michaelis |
| author_facet | E. Bahlmann I. Weinberg R. Seifert C. Tubbesing W. Michaelis |
| author_sort | E. Bahlmann |
| collection | DOAJ |
| description | The isotopic composition of volatile organic compounds (VOCs) can provide valuable information on their sources and fate not deducible from mixing ratios alone. In particular the reported carbon stable isotope ratios of chloromethane and bromomethane from different sources cover a &delta;<sup>13</sup>C-range of almost 100&permil; making isotope ratios a very promising tool for studying the biogeochemistry of these compounds. So far, the determination of the isotopic composition of C<sub>1</sub> and C<sub>2</sub> halocarbons others than chloromethane is hampered by their low mixing ratios. <br><br> In order to determine the carbon isotopic composition of C<sub>1</sub> and C<sub>2</sub> halocarbons with mixing ratios as low as 1 pptv (i) a field suitable cryogenic high volume sampling system and (ii) a chromatographic set up for processing these samples have been developed and validated. The sampling system was tested at two different sampling sites, an urban and a coastal location in Northern Germany. The average &delta;<sup>13</sup>C-values for bromomethane at the urban site were −42.9 ± 1.1&permil; and agreed well with previously published results. But at the coastal site bromomethane was substantially enriched in <sup>13</sup>C by almost 10&permil;. Less pronounced differences were observed for chlorodifluoromethane, 1,1,1-trichloroethane and chloromethane. We suggest that these differences are related to the turnover of these compounds in ocean surface waters. Furthermore we report first carbon isotope ratios for iodomethane (−40.4&permil; to −79.8&permil;), bromoform (−13.8&permil; to 22.9&permil;), and other halocarbons. |
| first_indexed | 2024-12-12T05:01:10Z |
| format | Article |
| id | doaj.art-b8ce00cb2d67473d846e08f0c800223d |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-12T05:01:10Z |
| publishDate | 2011-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-b8ce00cb2d67473d846e08f0c800223d2022-12-22T00:37:14ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482011-10-014102073208610.5194/amt-4-2073-2011A high volume sampling system for isotope determination of volatile halocarbons and hydrocarbonsE. BahlmannI. WeinbergR. SeifertC. TubbesingW. MichaelisThe isotopic composition of volatile organic compounds (VOCs) can provide valuable information on their sources and fate not deducible from mixing ratios alone. In particular the reported carbon stable isotope ratios of chloromethane and bromomethane from different sources cover a &delta;<sup>13</sup>C-range of almost 100&permil; making isotope ratios a very promising tool for studying the biogeochemistry of these compounds. So far, the determination of the isotopic composition of C<sub>1</sub> and C<sub>2</sub> halocarbons others than chloromethane is hampered by their low mixing ratios. <br><br> In order to determine the carbon isotopic composition of C<sub>1</sub> and C<sub>2</sub> halocarbons with mixing ratios as low as 1 pptv (i) a field suitable cryogenic high volume sampling system and (ii) a chromatographic set up for processing these samples have been developed and validated. The sampling system was tested at two different sampling sites, an urban and a coastal location in Northern Germany. The average &delta;<sup>13</sup>C-values for bromomethane at the urban site were −42.9 ± 1.1&permil; and agreed well with previously published results. But at the coastal site bromomethane was substantially enriched in <sup>13</sup>C by almost 10&permil;. Less pronounced differences were observed for chlorodifluoromethane, 1,1,1-trichloroethane and chloromethane. We suggest that these differences are related to the turnover of these compounds in ocean surface waters. Furthermore we report first carbon isotope ratios for iodomethane (−40.4&permil; to −79.8&permil;), bromoform (−13.8&permil; to 22.9&permil;), and other halocarbons.http://www.atmos-meas-tech.net/4/2073/2011/amt-4-2073-2011.pdf |
| spellingShingle | E. Bahlmann I. Weinberg R. Seifert C. Tubbesing W. Michaelis A high volume sampling system for isotope determination of volatile halocarbons and hydrocarbons Atmospheric Measurement Techniques |
| title | A high volume sampling system for isotope determination of volatile halocarbons and hydrocarbons |
| title_full | A high volume sampling system for isotope determination of volatile halocarbons and hydrocarbons |
| title_fullStr | A high volume sampling system for isotope determination of volatile halocarbons and hydrocarbons |
| title_full_unstemmed | A high volume sampling system for isotope determination of volatile halocarbons and hydrocarbons |
| title_short | A high volume sampling system for isotope determination of volatile halocarbons and hydrocarbons |
| title_sort | high volume sampling system for isotope determination of volatile halocarbons and hydrocarbons |
| url | http://www.atmos-meas-tech.net/4/2073/2011/amt-4-2073-2011.pdf |
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