Biomaterial Database

Photochemical degradation of polycyclic aromatic hydrocarbons (PAH) in real and laboratory conditions. 1985

F Valerio, and A Lazzarotto

Studies were carried out on the effects induced by the main components of airborne particulate matter (APM) as soot, inorganic and cyclohexane soluble substances and by glass fiber filters on photodegradation of pyrene, benz(a)anthracene and benzo(a)pyrene exposed to UV and solar radiation. In both experimental models tested hydrocarbons showed a higher photochemical stability when absorbed on APM. Inorganic components of APM slightly enhance UV photodegradation. In real condition (outdoor exposure to solar radiation) PAH half lives generally showed a good linear correlation with mean solar radiation intensity; only degradation rate of benzo(a)pyrene on APM, exposed to sunlight was practically constant. Pyrene, in particular, showed a higher degradation rate when high ozone concentrations (0.2 ppm) occurred.

UI	MeSH Term	Description	Entries
D010777	Photochemistry	A branch of physical chemistry which studies chemical reactions, isomerization and physical behavior that may occur under the influence of visible and/or ultraviolet light.	Photochemistries
D011083	Polycyclic Compounds	Compounds which contain two or more rings in their structure.	Compounds, Polycyclic
D011721	Pyrenes	A group of condensed ring hydrocarbons.
D002849	Chromatography, Gas	Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types are gas-solid chromatography, where the fixed phase is a solid, and gas-liquid, in which the stationary phase is a nonvolatile liquid supported on an inert solid matrix.	Chromatography, Gas-Liquid,Gas Chromatography,Chromatographies, Gas,Chromatographies, Gas-Liquid,Chromatography, Gas Liquid,Gas Chromatographies,Gas-Liquid Chromatographies,Gas-Liquid Chromatography
D006207	Half-Life	The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity.	Halflife,Half Life,Half-Lifes,Halflifes
D001551	Benz(a)Anthracenes	Four fused benzyl rings with three linear and one angular, that can be viewed as a benzyl-phenanthrenes. Compare with NAPHTHACENES which are four linear rings.	Benz(b)Phenanthrenes,Naphthanthracenes
D001564	Benzo(a)pyrene	A potent mutagen and carcinogen. It is a public health concern because of its possible effects on industrial workers, as an environmental pollutant, an as a component of tobacco smoke.	3,4-Benzopyrene,3,4-Benzpyrene,3,4 Benzopyrene,3,4 Benzpyrene
D013056	Spectrophotometry, Ultraviolet	Determination of the spectra of ultraviolet absorption by specific molecules in gases or liquids, for example Cl2, SO2, NO2, CS2, ozone, mercury vapor, and various unsaturated compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)	Ultraviolet Spectrophotometry
D013472	Sunlight	Irradiation directly from the sun.	Sunshine