Identifying airborne carbonyl compounds in isoprene atmospheric photooxidation products by their PFBHA oximes using gas chromatography/ion trap mass spectrometry

Article Abstract:

The effectiveness of chemical ionization of PFBHA-carbonyl derivatives in determining the molecular weight of unknown carbonyls is evaluated. It is shown that the chemical ionization of PFBHA oximes in an ion trap mass spectrometer provides molecular ion information which can be used for calculating the molecular weight of carbonyls. The results show that multifunctional carbonyls account for part of the missing reaction products in the atmospheric oxidation of isoprene.

Ionization

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Method for the detection of some soluble atmospheric carbonyl compounds

Article Abstract:

A method for the determination of gas-phase concentrations of glycolaldehye, glyoxal, methylglyoxal and formaldehyde is discussed. The technique, which utilizes a pyrex coil-gas-liquid scrubber sampler combined with a UV-visible detector-equipped high performance liquid chromatograph, was used in a rural field measurement site. The utility of the technique for measuring soluble atmospheric carbonyl compounds was demonstrated.

Methods, Usage, Scrubbers, High performance liquid chromatography, Scrubber (Chemical technology)

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Atmospheric fate of carbonyl oxidation products originating from alpha-pinene and delta3-carene: determination of rate of reaction with OH and NO3 radicals, UV absorption cross sections, and vapor pressures

Article Abstract:

The fate of carbonyl oxidation products of the terpenes alpha-pinene and delta3-carene are investigated. It was determined that direct condensation or homogenous nucleation could not occur due to the high vapor pressure. The presence of dicarbonyl compounds in particulate matter in the atmosphere is primarily due to reactions with Oh radicals.

Terpenes

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