Gas-phase atmospheric chemistry of selected thiocarbamates

Article Abstract:

Extensive research has allowed scientists to chart the gas-phase reactions of organophosphorous compounds in the atmosphere. As a result, scientists have been able to predict, with some certainty, the atmospheric lifetime of these substances, used commonly as insecticides. UC Riverside researchers have gone one step further by studying the gas-phase reactions of OH radicals, NO3 radicals and O3 in three classes of thiocarbamates, which are used as herbicides. Experimental procedures and results of this study are provided in detail.

Testing laboratories, Environmental aspects, Agricultural chemicals, Atmospheric chemistry, Herbicides

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Isomerization of beta-hydroxyalkoxy radicals formed from the OH radical-initiated reactions of C4-C8 1-alkenes

Article Abstract:

Direct air sampling atmospheric pressure ionization mass spectrometry was used to study the isomerization of beta-hydroxyalkoxy radicals formed in the OH radical-initiated reactions C4-C8 1-alkenes. Data provided direct proof for beta-hydroxyalkoxy radical isomerization through a six-member transition state. Data also showed that the importance of beta-hydroxyalkoxy radical isomerization in the OH radical-initiated reactions of 1-alkenes rises with carbon number.

Isomerization, Radicals (Chemistry), Olefins, Alkenes

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Observation of hydroxycarbonyls from the OH radical-initiated reaction of isoprene

Article Abstract:

Direct air sampling, atmospheric pressure ionization tandem mass spectrometer was used to evaluate the results of an OH radical reaction with isoprene and isoprene-d8 with nitrous oxide. Initial isoprene spectral analysis of air mixtures indicated weak ion peaks for isoprene and corresponding peaks for isoprene-d8. The two isoprene reactions generate one or both of the hydroxycarbonyls from the OH radical reaction.

Chemical reactions, Hydroxides

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