Evidence for the presence of Freon 21 in the atmosphere

摘要: MONITORING of trace constituents the atmosphere is becoming increasingly important because implications on quality life growing concentrations several compounds which, after industrial use, are released to atmosphere. In particular, Freons and other halocarbons need be checked problem ozone depletion1–4. Recently, search for tropospheric sinks has been considered in connection with controversy about withdrawing such from market. The hypothesis that F21 (CHCl2F), which no use apparently only produced as an impurity F12 (CCl2F2), could a decomposition product F11, made by workers5,6. However, detection quantitative analysis this compound extremely difficult because: (1) it present low concentration7; (2) gas chromatography (GC) separation difficult8; (3) there interferences sample contamination may easily occur. presence atmosphere, although detected researches, therefore still uncertain. Moreover, due sampling techniques used, do not strong concentration, our knowledge GC–mass spectrometry experiments have reported. We report here results obtained using fragmentography atmospheric samples country areas regions Urbino Rome.