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Titolo:
Gas/solid partitioning of semivolatile organic compounds (SOCs) to air filters. 2. Partitioning of polychlorinated dibenzodioxins, polychlorinated dibenzofurans, and polycyclic aromatic hydrocarbons to quartz fiber filters
Autore:
Mader, BT; Pankow, JF;
Indirizzi:
Oregon Grad Inst Sci & Technol, Dept Environm Sci & Engn, Portland, OR 97291 USA Oregon Grad Inst Sci & Technol Portland OR USA 97291 rtland, OR 97291 USA
Titolo Testata:
ATMOSPHERIC ENVIRONMENT
fascicolo: 7, volume: 35, anno: 2001,
pagine: 1217 - 1223
SICI:
1352-2310(2001)35:7<1217:GPOSOC>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
RELATIVE-HUMIDITY; ABSORPTION-MODEL; GAS; PARTICLE; AEROSOL; TEMPERATURE; ADSORPTION; ATMOSPHERE; SORPTION;
Keywords:
air; sampling; adsorption; artifacts; SOCs;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Pankow, JF Oregon Grad Inst Sci & Technol, Dept Environm Sci & Engn, POB 91000, Portland, OR 97291 USA Oregon Grad Inst Sci & Technol POB 91000 Portland OR USA 97291
Citazione:
B.T. Mader e J.F. Pankow, "Gas/solid partitioning of semivolatile organic compounds (SOCs) to air filters. 2. Partitioning of polychlorinated dibenzodioxins, polychlorinated dibenzofurans, and polycyclic aromatic hydrocarbons to quartz fiber filters", ATMOS ENVIR, 35(7), 2001, pp. 1217-1223

Abstract

Gas/particle distributions of atmospheric semi-volatile organic compounds (SOCs) are often measured using filter/sorbent samplers. Unfortunately, theadsorption of gaseous SOCs onto a filter can cause positive biases in the measured particle-phase concentrations, and negative biases in the measuredgas-phase concentrations. When quartz fiber filters (QFFs) are used, surface-area-normalized gas/quartz partition coefficient (K-p,K-s, m(3) m(-2)) values will be useful when estimating the magnitudes of these errors. Gas/QFF K-p,K-s values have been reported in the literature only for polycyclic aromatic hydrocarbons (PAHs) and n-alkanes. Gas/QFF K-p,K-s values were measured here for a series of polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), and also for a range of PAKs. Within each of the three individual compound classes, plots of log K-p,K-s vs. log P-L(o) (sub-cooled liquid vapor pressure) were found to be linear with slopes of approximately - 1. At relative humidity (RH) = 25%, the pooled log K-p,K-s data at 25 degreesC for the three compound classes were correlated with log p(L)(o) nearly as well (r(2) = 0.95) as were the data for the individualcompound classes (r(2) approximate to 0.97). In general, the K-p,K-s values for the PAHs and PCDD/PCDFs studied were found to be about a factor of 2 larger for partitioning to clean QFFs at RH = 25% than for TMFs at RH = 21-52%. Backup QFFs used in filter/sorbent sampling in a suburban area yieldedK-p,K-s values for PAHs at RH = 37% that were significantly lower than forclean QFFs at the same RH. (This may have been the result of the adsorption of ambient organic compounds that at least partially blocked the direct adsorption of the SOCs to the QFF surface). Therefore, when QFFs are used toseparate atmospheric gas- and particle-phase SOCs, corrections for compound-dependent gas adsorption artifacts for QFFs may need to be carried out using K-p,K-s values that were obtained with ambient backup QFFs. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 18/01/20 alle ore 07:56:57