Volatile hydrocarbons from the burning of grass and straw
Rapport, 1994

The concentrations and proportions of 15 alkenes, 5 alkadienes and 14 other gaseous combustion-formed hydrocarbons were determined near to a controlled field burning of last year´s grass. Small-scale model burning of grasses and of barley straw indicated similar hydrocarbon proportions for all these biomass fuels. Samples were taken on triple-layer adsorbent cartridges and were analyzed, after thermal desorption, by gas chromatography on an aluminium oxide column. The observed proportions of ethene (20-50%) and ethyne (5-20%) increased for flaming fire and decreased for smouldering. Approximate proportions of prominent genotoxic hydrocarbons other than ethene were 10% benzene, 10% propene, and 3% 1,3-butadiene. Among the photochemically reactive C4-C8 alkenes, the unbranched 1-alkenes were the most prominent isomers. It is concluded that grass burning implies hazards with respect to human exposure as well as to photooxidant formation.

air pollution

benzene

acetylene

propene

smoke

butadiene

ethylene

grassland fires

Författare

Gunnar Barrefors

Institutionen för kemisk miljövetenskap

Göran Petersson

Institutionen för kemisk miljövetenskap

Ämneskategorier

Analytisk kemi

Miljövetenskap