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Breath gas analysis is a method for gaining information on the clinical state of an individual by monitoring volatile organic compounds (VOCs) present in the exhaled breath. Exhaled breath is naturally produced by the human body through expiration and therefore can be collected in non-invasively and in an unlimited way. [1]
The VOC Solvents Emissions Directive was the main policy instrument for the reduction of industrial emissions of volatile organic compounds (VOCs) in the European Union. It covers a wide range of solvent-using activities, e.g. printing, surface cleaning, vehicle coating, dry cleaning and manufacture of footwear and pharmaceutical products.
IMS chip at the U.S. Pacific Northwest National Laboratory: this dime-sized chip provides dozens of channels through which ions travel (perpendicular to plane of view) to be separated and identified Ion mobility spectrometry ( IMS ) It is a method of conducting analytical research that separates and identifies ionized molecules present in the ...
In a photoionization detector, high-energy photons, typically in the vacuum ultraviolet (VUV) range, break molecules into positively charged ions. [2] As compounds enter the detector they are bombarded by high-energy UV photons and are ionized when they absorb the UV light, resulting in ejection of electrons and the formation of positively charged ions.
Thermal oxidizers are typically used to destroy hazardous air pollutants (HAPs) and volatile organic compounds (VOCs) from industrial air streams. These pollutants are generally hydrocarbon based and when destroyed, via thermal combustion, they are chemically oxidized to form CO 2 and H 2 O. Three main factors in designing the effective thermal ...
They are nitrates produced in the thermal equilibrium between organic peroxy radicals by the gas-phase oxidation of a variety of volatile organic compounds (VOCs), or by aldehydes and other oxygenated VOCs oxidizing in the presence of NO 2. [1] [2] [3]
Indoor materials such as gypsum boards or carpet act as VOC 'sinks', by trapping VOC vapors for extended periods of time, and releasing them by outgassing. The VOCs can also undergo transformation at the surface through interaction with ozone. [42] In both cases, these delayed emissions can result in chronic and low-level exposures to VOCs. [50]
The profiling of VOCs emitted by living organisms takes an increasing importance in various scientific domains like in medicine, in food sciences or in chemical ecology. For instance, in medicine, non-invasive diagnosis techniques of cancer based on the profiling of VOCs from the exhaled breath have been developed.