Gas-Chromatographic Measurements of Atmospheric Sulfur Hexafluoride

Abstract

From air samplings on aircraft in February and December 1982 and in February 1983, and from gas-chrornatographic measurements, the background volume mixing ratio of sulfur hexafluoride(SF6) over Japan was found to be about (0.72±0.13) ppt, where ppt=10−12. Since the first observation by Lovelock in 1970 (0.03 ppt), SF6 seems to have been increasing steadily.