3 documents found, page 1 of 1
Fontes, formação, reatividade e determinação de quinonas na atmosfera
Sousa,Eliane Teixeira; Lopes,Wilson A.; Andrade,Jailson B. deQuinones are a group of semi-volatile organic substances, ubiquitous in nature, belonging to the class of oxygenated polycyclic aromatic hydrocarbons (Oxygenated PAH). These compounds are formed in biogenic processes, through the oxidative metabolism of endogenous compounds, such as catecholamines, estrogen hormones and xenobiotics, as well as directly emitted to the atmosphere, through the incomplete combustio...
A semi-continuous analyzer for the fluorimetric determination of atmospheric fo...
Sousa,Eliane Teixeira; Oliveira,Fabio Santos de; Alves,Arnaldo Cardoso; Andrade,Jailson B. deThis paper describes a sensitive and selective semi-continuous analyzer (FORMAL-FLU) for the fluorimetric determination of atmospheric formaldehyde. The method is based on the reaction between formaldehyde and Fluoral-P, producing the fluorescent derivative 3,5-diacetyl-1,4-dihydrolutidine (DDL) which, when excited at 410 nm, fluoresces at 510 nm. This analyzer consists of a gas diffusion chamber with a central...
Alcohol- and gasohol-fuels: a comparative chamber study of photochemical ozone ...
Pereira,Pedro Afonso de P.; Santos,Leilane Maria B.; Sousa,Eliane Teixeira; Andrade,Jailson B. deVolatile organic compounds (VOC) play a significative role on the process of formation of photochemical smog. Photooxidants are formed in the atmosphere when VOC react with nitrogen oxides (NOx), in the presence of sunlight and OH radicals. In urban areas, vehicle fuels constitute an important source of VOC and NOx emissions to the atmosphere, either by burning or evaporative losses. This work is concerned with...