Real-Time Measurement Capabilities Using Aerosol Time-of-Flight Mass Spectrometry

Nordmeyer, Trent; Prather, Kimberly A.

doi:10.1021/ac00092a040

Cited by 58 publications

(39 citation statements)

References 12 publications

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“…In this paper we will focus on the results from the chemical analysis performed by an aerosol mass spectrometer (AMS) (Jayne et al, 2000; and compare the results to the CCN and IN activity measured by a cloud condensation nucleus counter (CCNC, Roberts and Nenes, 2005), an ice nucleus counter (CFDC, Sullivan et al, 2010b, original instrument version: Rogers et al (2001) and the Leipzig Aerosol Cloud Interaction Simulator LACIS Stratmann et al, 2004) (Nordmeyer and Prather, 1994) was used to estimate the number-fraction of particles coated.…”

Section: Particle Characterisationmentioning

confidence: 99%

Surface modification of mineral dust particles by sulphuric acid processing: implications for ice nucleation abilities

Reitz

Spindler²,

Mentel³

et al. 2011

Atmos. Chem. Phys.

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Abstract. The ability of coated mineral dust particles to act as ice nuclei (IN) was investigated at LACIS (Leipzig Aerosol Cloud Interaction Simulator) during the FROST1-and FROST2-campaigns (Freezing of dust). Sulphuric acid was condensed on the particles which afterwards were optionally humidified, treated with ammonia vapour and/or heat. By means of aerosol mass spectrometry we found evidence that processing of mineral dust particles with sulphuric acid leads to surface modifications of the particles. These surface modifications are most likely responsible for the observed reduction of the IN activation of the particles. The observed particle mass spectra suggest that different treatments lead to different chemical reactions on the particle surface. Possible chemical reaction pathways and products are suggested and the implications on the IN efficiency of the treated dust particles are discussed.

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Section: Particle Characterisationmentioning

confidence: 99%

Surface modification of mineral dust particles by sulphuric acid processing: implications for ice nucleation abilities

Reitz

Spindler²,

Mentel³

et al. 2011

Atmos. Chem. Phys.

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“…The four most commonly used types are: (1) particle analysis by laser MS (PALMS; National Oceanic and Atmospheric Administration [NOAA]) 279 ; (2) rapid single particle mass spectrometer (RSMS; University of Delaware) 280,281 ; (3) aerosol time-of-flight MS (ATOFMS; TSI, Inc.) 282 ; and (4) AMS (Aerodyne). 283 These instruments decompose individual particles and ionize their components followed by time-of-flight (TOF) or quadrapole MS detection.…”

Section: Particle Mass Spectrometersmentioning

confidence: 99%

Advances in Integrated and Continuous Measurements for Particle Mass and Chemical Composition

Chow

Doraiswamy

Watson

et al. 2008

Journal of the Air & Waste Management Association

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Recent improvements in integrated and continuous PM 2.5 mass and chemical measurements from the Supersite program and related studies in the past decade are summarized. Analytical capabilities of the measurement methods, including accuracy, precision, interferences, minimum detectable levels, comparability, and data completeness are documented. Upstream denuders followed by filter packs in integrated samplers allow an estimation of sampling artifacts. Efforts are needed to: (1) address positive and negative artifacts for organic carbon (OC), and (2) develop carbon standards to better separate organic versus elemental carbon (EC) under different temperature settings and analysis atmospheres. Advances in thermal desorption followed by gas chromatography/ mass spectrometry (GC/MS) provide organic speciation of approximately 130 nonpolar compounds (e.g., n-alkanes, alkenes, hopanes, steranes, and polycyclic aromatic hydrocarbons [PAHs]) using small portions of filters from existing integrated samples. Speciation of water-soluble OC (WSOC) using ion chromatography (IC)-based instruments can replace labor-intensive solvent extraction for many compounds used as source markers. Thermal gasbased continuous nitrate and sulfate measurements underestimate filter ions by 10 -50% and require calibration against on-site filter-based measurements. IC-based instruments provide multiple ions and report comparable (Ϯ10%) results to filter-based measurements. Maintaining a greater than 80% data capture rate in continuous instruments is labor intensive and requires experienced operators. Several instruments quantify black carbon (BC) by optical or photoacoustic methods, or EC by thermal methods. A few instruments provide real-time OC, EC, and organic speciation. BC and EC concentrations from continuous instruments are highly correlated but the concentrations differ by a factor of two or more. Site-and season-specific mass absorption efficiencies are needed to convert light absorption to BC. Particle mass spectrometers, although semiquantitative, provide much information on particle size and composition related to formation, growth, and characteristics over short averaging times. Efforts are made to quantify mass by collocating with other particle sizing instruments. Common parameters should be identified and consistent approaches are needed to establish comparability among measurements.

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“…In addition, with an Excimer laser, multiple wavelengths can be applied. Weiss 7) also implemented a new triggering circuit based on the design of Nordmeyer and Prather 9) , who were the first to implement such a triggering circuitry in an aerosol mass spectrometer. Software to acquire and process the data of the instrument was also developed by Weiss 7) .…”

Section: Introductionmentioning

confidence: 99%

Single Particle Mass Spectrometry–Bioaerosol Analysis by MALDI MS

Kleefsman

Stowers

Verheijen

et al. 2008

KONA

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Real-Time Measurement Capabilities Using Aerosol Time-of-Flight Mass Spectrometry

Cited by 58 publications

References 12 publications

Surface modification of mineral dust particles by sulphuric acid processing: implications for ice nucleation abilities

Surface modification of mineral dust particles by sulphuric acid processing: implications for ice nucleation abilities

Advances in Integrated and Continuous Measurements for Particle Mass and Chemical Composition

Single Particle Mass Spectrometry–Bioaerosol Analysis by MALDI MS

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