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Titolo:
The continuous analysis of nitrate and ammonium in aerosols by the steam jet aerosol collector (SJAC): extension and validation of the methodology
Autore:
Slanina, J; ten Brink, HM; Otjes, RP; Even, A; Jongejan, P; Khlystov, A; Waijers-Ijpelaan, A; Hu, M;
Indirizzi:
Netherlands Energy Res Fdn, NL-1755 ZG Petten, Netherlands Netherlands Energy Res Fdn Petten Netherlands NL-1755 ZG en, Netherlands Peking Univ, Ctr Environm Sci, Beijing 100871, Peoples R China Peking Univ Beijing Peoples R China 100871 ijing 100871, Peoples R China Iowa State Univ, Ames, IA 50011 USA Iowa State Univ Ames IA USA 50011Iowa State Univ, Ames, IA 50011 USA
Titolo Testata:
ATMOSPHERIC ENVIRONMENT
fascicolo: 13, volume: 35, anno: 2001,
pagine: 2319 - 2330
SICI:
1352-2310(2001)35:13<2319:TCAONA>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
THERMODENUDER SYSTEM; ION CHROMATOGRAPHY; AMBIENT AIR; DENUDER;
Keywords:
aerosol; chemical analysis; nitrate; ammonium; on-line;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Slanina, J Netherlands Energy Res Fdn, POB 1, NL-1755 ZG Petten, Netherlands Netherlands Energy Res Fdn POB 1 Petten Netherlands NL-1755 ZG
Citazione:
J. Slanina et al., "The continuous analysis of nitrate and ammonium in aerosols by the steam jet aerosol collector (SJAC): extension and validation of the methodology", ATMOS ENVIR, 35(13), 2001, pp. 2319-2330

Abstract

Classical methodology based on the application of filters for sampling, followed by extraction and analysis, introduces severe artifacts for semi-volatile compounds like ammonium nitrate. These filter methods do not meet therequirements for the assessment of the impact of aerosols on acidification, air quality and especially on the radiative balance, in terms of requiredspeed, detection limits and selectivity. These artifacts are avoided by using a steam jet aerosol collector sampler, based on scavenging of aerosols by droplet formation, in combination with on-line analytical techniques such as ion-chromatography for nitrate and membrane separation followed by conductivity detection for ammonium. The SJAC sampler combines very low blankswith high efficiency of collection of particles. The ammonium detector andthe IC system, based on 1-point internal standard calibration in combination with correction for curved calibration graphs, enables detection of ammonium and nitrate at background conditions, the detection limit is about 0.02 mug m(-3) of ammonium and nitrate. Accuracy is, depending on ambient concentration, in the order of 5-10% relative, at a range of 0.05-50 mug m(-3). The: time resolution is 15-120min, depending on required detection limit, and is short enough for continuously monitoring the chemical composition ofaerosols. Quality assurance and quality control experiments and intercomparison experiments with classical filter methods, thermo-denuder systems, denuder difference methods and other continuous monitoring techniques have shown that the results are reliable. The instrument has successfully been employed in field campaigns in Europe and the US. (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 28/03/20 alle ore 10:47:48