Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Semivolatile behavior of dicarboxylic acids and other polar organic species at a rural background site (Nylsvley, RSA)
Autore:
Limbeck, A; Puxbaum, H; Otter, L; Scholes, MC;
Indirizzi:
Tech Univ Vienna, Inst Analyt Chem, A-1060 Vienna, Austria Tech Univ Vienna Vienna Austria A-1060 alyt Chem, A-1060 Vienna, Austria CSIR, Environmentek, ZA-0001 Pretoria, South Africa CSIR Pretoria South Africa ZA-0001 entek, ZA-0001 Pretoria, South Africa Univ Witwatersrand, Dept Anim Plant & Environm Sci, Johannesburg, South Africa Univ Witwatersrand Johannesburg South Africa Johannesburg, South Africa
Titolo Testata:
ATMOSPHERIC ENVIRONMENT
fascicolo: 10, volume: 35, anno: 2001,
pagine: 1853 - 1862
SICI:
1352-2310(2001)35:10<1853:SBODAA>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
AIRBORNE PARTICULATE MATTER; CARBONACEOUS PARTICLES; AROMATIC-HYDROCARBONS; ATMOSPHERIC AEROSOLS; AMBIENT AIR; DISTRIBUTIONS; EMISSIONS; ARTIFACT; PHASE; URBAN;
Keywords:
organic aerosol; sampling artifacts; oxalic acid; malonic acid; succinic acid; ambient aerosols;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Puxbaum, H Tech Univ Vienna, Inst Analyt Chem, Getreidemarkt 9-151, A-1060Vienna, Austria Tech Univ Vienna Getreidemarkt 9-151 Vienna Austria A-1060 ria
Citazione:
A. Limbeck et al., "Semivolatile behavior of dicarboxylic acids and other polar organic species at a rural background site (Nylsvley, RSA)", ATMOS ENVIR, 35(10), 2001, pp. 1853-1862

Abstract

In this study aerosol samples from the South African savanna were analyzedfor their polar organic constituents. Samples were collected with a front/back-up filter tandem system of quartz fiber filters (dual filter strategy). In all samples (n = 15) dicarboxylic acids and a variety of phthalates, aldehydes and monocarboxylic acids were observed. Oxalic acid was the dominating compound with an average amount of 79.2 ng m(-3) on the front filter and 11.3 ng m(-3) on the back-up filter. The presence of significant concentrations of dicarboxylic acids on the back-up filter was rather unexpected. There are two possible sources to explain the presence of individual compounds on the back-up filter - particle penetration through the front filter or adsorption of compound parts from the gas phase. Interpretation of the data indicates that the dicarboxylic acid concentrations on the back-up filters appear to be caused by the adsorption of gaseous organic species. Dicarboxylic acids semivolatilic behavior is evident with this results. This conclusion refutes the commonly held view that dicarboxylic acids in the atmosphere were associated with the aerosol phase only. Additionally, it was found that the distribution of dicarboxylic acids between the gas and particle phase in the atmosphere is not only dependent on their vapor pressures. Theactual gas phase concentration appears to be more determined by the chemical properties of the particles than by pure physical influences. Surprisingly, malonic acid exhibits an anomaly, as it does not show a semivolatile tendency. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 03:57:13