Product formation from the gas-phase reactions of OH radicals and O3 with a series of monoterpenes

Abstract

The formation yields of nine carbonyl products are reported from the gas-phase OH radical-initiated reactions (in the presence of NOx) and the O3 reactions with seven monoterpenes. The products were identified using GC/MS and GC-FTIR and quantified by GC-FID analyses of samples collected on Tenax solid adsorbent cartridges. The identities of products from camphene, limonene and β-pinene were confirmed by comparison with authentic standards. Sufficient quantities of products from the 3-carene, limonene, α-pinene, sabinene and terpinolene reactions were isolated to allow structural confirmation by proton NMR spectroscopy. The measured total carbonyl formation yields ranged from non-detectable for the OH radical reaction with camphene and the O3 reactions with 3-carene and limonene to ∼0.5 for the OH radical reaction with limonene and the O3 reaction with sabinene. © 1994 Kluwer Academic Publishers.