Abstract
Atmospheric volatile organic compounds (VOCs) in Guiyang were investigated in this study. The composition and concentrations of 59 photochemically active VOCs were analyzed, based on whole air samples collected in stainless steel canisters followed with laboratory analysis by three-stage preconcentration and coupled GC/Dean-switch/FID/FID analyzer. The impacts of different VOCs species on ozone formation potential (OFP) and OH loss rate (LOH) were analyzed. The results show that the average mixing ratio of the measured total VOCs was (23.06±17.85)×10-9, of which propane was the most abundant species. During the sampling period in Guiyang, alkanes accounted for 58.77% of the total VOCs concentrations, followed by aromatics (16.41%), alkenes (10.84%), alkynes (8.86%) and biogenic VOCs (5.12%). The abundances and patterns varied with different functional areas in Guiyang. The estimated total OFP of VOCs was 91.51×10-9 and the total LOH was 6.15 s-1. The aromatics contributed the most (38%) to the total OFP, and alkenes were the most active species contributing to the total OH radical loss rate.
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