Development of a techniuqe to measure tropospheric OH using liquid derivatisation and HPLC with fluorescence detection

摘要

The OH radical is one of the most important oxidants in the torposphere,as it initiates the daytime photochemical degradation of carbon kmonoxide,mehtane and other hydrocarbons.It is,however,one of the most challenging species to measrue in ambient air,with maximum daytime concentrations of 1-10 x 10~6 molecules /m~3 and a chemicla lifetime of an individual molecule of apporximately 1 s in the clean troposphere (Crosley,1995).