A chamber study of alkyl nitrate production formed by terpene ozonolysis in the presence of NO and alkanes.

Organic nitrates are relatively long-lived species and have been shown to have a potential impact on atmospheric chemistry on local, regional, and even global scales. However, the significance of these compounds in the indoor environment remains to be seen. This work describes an impinger-based sampling and analysis technique for organic nitrate species, focusing on formation via terpene ozonolysis in the presence of nitric oxide (NO).

Limonene ozonolysis in the presence of nitric oxide: Gas-phase reaction products and yields.

The reaction products from limonene ozonolysis were investigated using the new carbonyl derivatization agent, --butylhydroxylamine hydrochloride (TBOX). With ozone (O) as the limiting reagent, five carbonyl compounds were detected. The yields of the carbonyl compounds are discussed with and without the presence of a hydroxyl radical (OH•) scavenger, giving insight into the influence secondary OH radicals have on limonene ozonolysis products.

Identification and quantification of carbonyl-containing α-pinene ozonolysis products using --butylhydroxylamine hydrochloride.

The yields of carbonyl-containing reaction products from the ozonolysis of α-pinene have been investigated using concentrations of ozone found in the indoor environment ([O] ≤ 100 ppb). An impinger was used to collect gas-phase oxidation products in water, where the derivatization agent -tert-butylhydroxylamine hydrochloride (TBOX) and gas chromatography-mass spectrometry were used to identify carbonyl-containing species. Seven carbonyl-containing products were observed.

Gas-phase reaction products and yields of terpinolene with ozone and nitric oxide using a new derivatization agent.

The new derivatization agent, --butylhydroxylamine hydrochloride (TBOX) was used to investigate the carbonyl reaction products from terpinolene ozonolysis. With ozone (O) as the limiting reagent, four carbonyl compounds were detected: methylglyoxal (MG), 4-methylcyclohex-3-en-1-one, (4MCH), 6-oxo-3-(propan-2-ylidene) heptanal (6OPH), and 3,6-dioxoheptanal (36DOH). The tricarbonyl 36DOH has not been previously observed.

Investigation of terpinolene + ozone or terpinolene + nitrate radical reaction products using denuder/filter apparatus.

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.

2-Butoxyethanol and Benzyl Alcohol Reactions with the Nitrate Radical: Rate Coefficients and Gas-Phase Products.

The bimolecular rate coefficients [Formula: see text] and [Formula: see text] were measured using the relative rate technique at (297 ± 3) K and 1 atmosphere total pressure. Values of (2.7 ± 0.

A 13C CP/MAS and 31P NMR study of the interactions of dipalmitoylphosphatidylcholine with respirable silica and kaolin.

The interaction of silica and kaolin with dipalmitoylphosphatidylcholine (DPPC) has been studied using 13C and 31P solid state nuclear magnetic resonance spectroscopy. These studies explore the molecular interactions of these respirable dusts with a model lung surfactant species to characterize silica toxicity in mixed systems. The choline head group of DPPC was found to remain mobile when adsorbed on kaolin, in contrast to an immobile head group on silica.

Characterization of hard metal dusts from sintering and detonation coating processes and comparative hydroxyl radical production.

Dust samples from sintering and detonation coating hard-metal processes were characterized, compared, and contrasted for morphology, composition, and generation of hydroxyl radicals. Inhalation of respirable hard-metal (sintered carbide) dusts from hard-metal processes is known to cause fibrotic and asthmatic lung disease. Scanning electron microscopy/energy-dispersive X-ray analysis was used for morphology, composition, and elemental distribution.