Investigation of terpinolene + ozone or terpinolene + nitrate radical reaction products using denuder/filter apparatus.
Harrison JC; Wells JR
Atmos Environ 2013 Dec; 80:524-532
Terpinolene's (1-methyl-4-(propan-2-ylidene)cyclohexene) reaction with ozone or the nitrate radical was investigated using a denuder/filter apparatus in order to characterize gas-phase and particulate reaction products. Identification of the reaction products (i.e., aldehydes, ketones, dicarbonyls and carboxylic acids) was made using two derivatization methods; O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine (PFBHA) to derivatize the carbonyl products or 3-Ethyl-1-[3-(dimethylamino)propyl]carbodiimide hydrochloride (EDC) and 2,2,2-trifluoroethylamine hydrochloride (TFEA) to derivatize the carboxylic acid products. Proposed carbonyl products for ozonolysis of terpinolene are: 4-methylcyclohex-3-en-1-one, 2-hydroxy-4-methylcyclohex-3-en-1-one, glyoxal, methyl glyoxal, 3-oxobutanal, and 6-oxo-3-(propan-2-ylidene)heptanal. Proposed carbonyl products for nitrate radical reaction of terpinolene are: 2-hydroxy-4-methylcyclohex-3-en-1-one, glyoxal, methyl glyoxal, and 4-oxopentanal. No carboxylic acid products were detected with either oxidizing reactant.
Physical-chemistry; Chemical-kinetics; Chemical-properties; Chemical-reactions; Reaction-rates; Kinetics; Ketones; Carboxylic-acids; Carbonyls; Nitrates; Aldehydes; Free-radicals; Organic-compounds; Analytical-chemistry; Analytical-processes; Filters; Gas-indicators; Particulates; Laboratory-testing;
Author Keywords: Ozone; Nitrate radical; Reaction products; Oxygenated organic compounds; Denuder
J.R. Wells, Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505, USA
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