摘要：Gas chromatographic analysis by the low-temperature condensation method was applied to the determination of a trace amount of methyl bromide and ethyl bromide in the atmosphere. The sample air was trapped in a vacuum bottle of 1 l capacity from the environmental atmosphere, placed in the sample condensation tube, filled with 1% TCP-Shimalite and chilled in liquid oxygen, and the tube was heated to introduce the test component into the gas chromatograph. This method allowed a recovery of over 90% of methyl and ethyl bromides, and precision of repetition was below 10% in variability rate. This method of determination was not interfered by the presence of hydrocarbons and organosulfur compounds. Limit of detection was 0.14 ppb for methyl bromide and 60 ppb for ethyl bromide. This method was therefore found to be a useful method for the determination of a trace amount of aliphatic hydrocarbons in the atmosphere. This method was applied for the test of air around the border of a craft pulp factory and methyl bromide of around 1 ppb was detected.
关键词：methyl bromide;ethyl bromide;liquid oxygen;low temperature concentrating;sampling vacuum bottle;concentration u-type tube;gaschromatograph with FID
