Design and gas sampling performance

Article Abstract:

A high-volume air sampler was modified so that it would collect gas-phase and particulate-phase organic compounds. The components of the sampler included a backup filter, polyurethane foam sheets (PUFSs) and Tenax cartridges. The PUFSs were more effective than polyurethane foam plugs in allowing high rates of flow with little drop in pressure. A short amount of time was needed to obtain an adequate sample volume. This reduced the chance of volatilization losses or adsorption gains from fluctuations in atmospheric concentration.

Analysis, Gases, Particles, Particulate matter, Air sampling apparatus, Air sampling equipment

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Method for determination of methyl tert-butyl ether and its degradation products in water

Article Abstract:

An analytical method for the detection of major alkyl ether compounds used as gasoline oxygenates is developed which surmounts the problems associated with detecting such compounds that are difficult to measure at low concentrations in water. The technique employes direct aqueous injection and gas chromatography with detection achieved by mass spectrometry. This enables the identification of methyl tert-butyl ether and its degradation byproducts evan at sub-ppb concentrations.

All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Methyl Tert-Butyl Ether, MTBE, Mass spectrometry, Gas chromatography, Methyl tertiary butyl ether, Oxygenates, Oxygenates (Fuel additives)

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Conversion of nicotine in tobacco smoke to its volatile and available free-base form through the action of gaseous ammonia

Article Abstract:

Ammonia appears to promote the volatility of nicotine from environmental tobacco smoke (ETS) and most especially mainstream smoke (MSS) particles. A reduction in the gas/particle partitioning constant results to an increased availability of nicotine from MSS and ETS. Results from the gas/particle partitioning of nicotine indicate that about 25% of nicotine will be converted into the gaseous phase at a temperature of 25 degrees celsius.

Other Tobacco Product Manufacturing, Medicinal and Botanical Manufacturing, Medicinals and botanicals, Chewing and smoking tobacco, Smoking Tobacco, Nicotinic Acid, Environmental aspects, Nicotine, Smoking, Passive smoking, Bulk vitamins, Niacin

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