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C5H5, a colorless volatile liquid which
is insoluble in water, soluble in alcohol, and very reactive because of its low
vapor pressure and double bonds. From an atmospheric chemistry point of view,
isoprene is emitted from trees and plants, globally on the order of teragrams
(1012 g) per year. This reactive, natural hydrocarbon may influence
the oxidative/reductive balance in the biosphere where its concentrations are
significant, in regions such as rainforests and large temporal forests. Most
isoprene is directly emitted into the atmosphere from plant surfaces and some no
doubt condenses on particulate matter. Emission rates from trees are positively
correlated with leaf temperature and therefore, to a degree, time of day.
Ultimately the carbon in isoprene is oxidized to carbon monoxide and finally
carbon dioxide.
[Oecologia; v99; 260; 1994] [Clinical Chemistry; v40; 1485;
1994.]
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