Abstract. A comprehensive chamber investigation of photochemical secondary organic aerosol (SOA) formation and transformation in mixtures anthropogenic (o-cresol) biogenic (α-pinene isoprene) volatile compound (VOC) precursors the presence NOx inorganic seed particles was conducted. To enable direct comparison across systems, initial concentration (hence reactivity) systems towards dominant OH ...

salvia leriifolia benth. from lamiaceae family is a plant native to iran and afghanistan with significant applications in medical, pharmaceutical and food industries. the aim of current investigation was to evaluate the composition and antioxidant activity of essential oils (eos) of s. leriifolia growing naturally in neyshabur and bajestan (northeast of iran). the aerial parts of the plant were...

The Douglas fir terpene alpha-pinene was shown to inhibit the growth of a variety of bacteria and a yeast. Other terpenes of the Douglas fir, including limonene, camphene, and isobornyl acetate, were also inhibitory to Bacillus thuringiensis. All terpenes were inhibitory at concentrations normally present in the fir needle diet of Douglas fir tussock moth larvae. The presence of such terpenes i...

The essential oil composition of Rhus cotinus L. (syn. Cotinus coggygria Scop.; Family: Anacardiaceae), was analyzed by GC and GC-MS. The in vitro antioxidant activity was assessed by β-carotene bleaching test, reducing power, DPPH radical scavenging and inhibition of lipid peroxidation methods. A total of 30 compounds were identified with the dominance of monoterpenes (65.9%) viz. β-Pinene, ca...

Thermodenuding particles can provide insights into aerosol composition and may be a way to create particles in laboratory chambers that better mimic the atmosphere. The relative volatility of secondary organic aerosol (SOA) was investigated by evaporating organics from the particles using a thermodenuder (TD) at temperatures between ∼ 60 and 100 C. Volatility was influenced by the parent hydroc...

Biofiltration is cost-effective for the treatment of gases containing low concentrations of volatile organic compounds ðo3 g m Þ: However, conventional biofilters, based on compost and bacterial activity, face problems with the elimination of hydrophobic compounds. Besides that, biofilter operational stability is often hampered by acidification and drying out of the filter bed. To overcome thes...

An Aerodyne Aerosol Mass Spectrometer (AMS) has been utilised to provide on-line measurements of the mass spectral signatures and mass size distributions of the oxidation products resulting from irradiating 1,3,5trimethylbenzene (1,3,5-TMB) and α-pinene, separately, in the presence of nitrogen oxide, nitrogen dioxide and propene in a reaction chamber. Mass spectral results indicate that both pr...