The background atmospheric concentrations of cyclic perfluorocarbon tracers determined by negative ion-chemical ionization mass spectrometry |
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| Institution: | 1. School of Chemistry, University of Bristol, Bristol BS8 1TS, UK;2. Sira Ltd., South Hill, Chislehurst, Kent BR7 5EH, UK;3. Environmental Sciences Department, Brookhaven National Laboratory, Upton, NY 11973, USA;1. Air Quality Research Center, University of California, Davis, CA 95616, USA;2. Yolo County Division of Integrated Waste Management, Woodland, CA 95776, USA;3. Department of Civil and Environmental Engineering, University of Delaware, 344A DuPont Hall, Newark, DE 19716, USA;4. Geoscience and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;5. Institute for Environmental Management (IEM), Inc, Palo Alto, CA 94306, USA |
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| Abstract: | The background atmospheric mixing ratios for a range of cyclic perfluorocarbons (cyclic-PFCs), widely used in atmospheric dispersion studies, have been measured by gas chromatography-mass spectrometry in negative ion-chemical ionization mode. Background concentrations range from <1 fl l−1 to >10 fl l−1, where femtolitre is expressed as parts in 1015 (ppqv). Because of their very long atmospheric lifetimes (>3000 yr) the present day concentrations represent the accumulated emissions from all sources, although significant commercial production did not commence until the 1960s. Cyclic-PFCs are potent greenhouse gases; however, their atmospheric concentrations are currently so low as to make an insignificant contribution to global warming. |
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