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CCQM-K83 Draft A Report: International Comparison CCQM-K83 Halocarbons in Dry Whole Air



George C. Rhoderick, Franklin R. Guenther, David L. Duewer, Jeongsoon Lee, Jin Seog Kim, Dongmin Moon, Jinbok Lee


The growing awareness of climate change/global warming and continuing concerns regarding stratospheric ozone depletion will require future measurements and standards for many compounds, in particular halocarbons that are linked to these issues. In order to track and possibly control the emissions of these species globally in the atmosphere, it is necessary to demonstrate measurement equivalence at the highest levels of accuracy for assigned values of standards. This report describes the results of a key comparison for several of the more important halocarbons at atmospheric concentration levels. The comparison includes the chlorofluorocarbons (CFCs) dichlorodifluoromethane (CFC 12), trichlorofluoromethane (CFC 11), and 1,1,2 trichlorotrifluoroethane (CFC 113); the hydrogen chlorofluorocarbons (HCFCs) difluorochloromethane (HCFC 22) and difluorochloroethane (HCFC 142b); and the hydrogen fluorocarbon (HFC) 1,1,1,2 tetrafluoroethane (HFC 134a), all in a dried whole air sample. The objective of this key comparison is to compare the measurement capabilities of the participants for these halocarbons at trace atmospheric levels.


halocarbons, international comparison, CCQM, dry whole air, ambient mole fractions


Rhoderick, G. , Guenther, F. , Duewer, D. , Lee, J. , , J. , Moon, D. and Lee, J. (2014), CCQM-K83 Draft A Report: International Comparison CCQM-K83 Halocarbons in Dry Whole Air, Metrologia, [online], (Accessed July 24, 2024)


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Created June 2, 2014, Updated September 25, 2020