2006 Progress Report: Aethalometric Liquid Chromatographic Mass Spectrometric Instrument

EPA Grant Number: R831074
Title: Aethalometric Liquid Chromatographic Mass Spectrometric Instrument
Investigators: Dasgupta, Purnendu K.
Institution: The University of Texas at Arlington
EPA Project Officer: Chung, Serena
Project Period: September 1, 2003 through December 31, 2007 (Extended to December 31, 2008)
Project Period Covered by this Report: September 1, 2005 through December 31, 2006
Project Amount: $450,000
RFA: Measurement, Modeling, and Analysis Methods for Airborne Carbonaceous Fine Particulate Matter (PM2.5) (2003) RFA Text |  Recipients Lists
Research Category: Air , Air Quality and Air Toxics , Particulate Matter

Objective:

The objective is to fabricate, evaluate, and field test new instrumentation that can provide more information on the speciation of carbonaceous compounds in the atmosphere.

Progress Summary:

We have been working on developing a means to classify water-soluble and insoluble carbon based on the ease with which it is oxidized to CO2 by liquid phase radical and photooxidation processes. The evolved CO2 permeates through a membrane and directly affects the conductivity of a receptor liquid therein. We have developed a novel contactless means of measuring conductivity that in turn provides a direct measurement of the carbon contained in the particles.

The present effort is directed towards: (1) making a slurry type sampler to collect particles; (2) initially degassing the sample to remove dissolved CO2; (3) exposing the sample to UV radiation to perform photooxidation; (4) performing simultaneous or after-the-fact air (CO2-scrubbed) purging of the reaction mixture to determine photooxidized carbon and the kinetics of the CO2 formation; (5) measuring the evolved CO2 by exposing a receptor-filled membrane tube in the evolved gas stream and directly measuring the conductivity in a contactless fashion; and (6) repeating steps (3)-(5) with more aggressive oxidation techniques (e.g., putting in a suspension of TiO2 and then adding persulfate).

This system will provide a simpler, faster, and better alternative to thermooptical characterization of carbonaceous particles.

Future Activities:

We have recently moved from Texas Tech University to the University of Texas at Arlington. The project has gone through a Novation transfer. Basic research into classifying carbon on solution phase oxidation will continue.


Journal Articles on this Report : 8 Displayed | Download in RIS Format

Other project views: All 46 publications 22 publications in selected types All 22 journal articles
Type Citation Project Document Sources
Journal Article Arnold JR, Hartsell BE, Luke WT, Ullah SMR, Dasgupta PK, Huey LG, Tate P. Field test of four methods for gas-phase ambient nitric acid. Atmospheric Environment 2007;41(20):4210-4226. R831074 (2006)
R831074 (Final)
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  • Journal Article Dasgupta PK, Campbell SW, Al-Horr RS, Ullah SMR, Li J, Amalfitano C, Poor ND. Conversion of sea salt aerosol to NaNO3 and the production of HCl:analysis of temporal behavior of aerosol chloride/nitrate and gaseous HCl/HNO3 concentrations with AIM. Atmospheric Environment 2007;41(20):4242-4257. R831074 (2006)
    R831074 (2007)
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  • Journal Article Luke WT, Arnold JR, Watson TB, Dasgupta PK, Li J, Kronmiller K, Hartsell BE, Tamanini T, Lopez C, King C. The NOAA Twin Otter and its role in BRACE: a comparison of aircraft and surface trace gas measurements. Atmospheric Environment 2007;41(20):4190-4209. R831074 (2006)
    R831074 (Final)
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  • Journal Article Luke WT, Arnold JR, Gunter RL, Watson TB, Wellman DL, Dasgupta PK, Li J, Riemer D, Tate P. The NOAA Twin Otter and its role in BRACE: platform description. Atmospheric Environment 2007;41(20):4177-4189. R831074 (2006)
    R831074 (Final)
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  • Journal Article Martinelango PK, Dasgupta PK, Al-Horr RS. Atmospheric production of oxalic acid/oxalate and nitric acid/nitrate in the Tampa Bay airshed:parallel pathways. Atmospheric Environment 2007;41(20):4258-4269. R831074 (2006)
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  • Journal Article Ullah SMR, Williams A, Dasgupta PK. Automated low-pressure carbonate eluent ion chromatography system with postsuppressor carbon dioxide removal for the analysis of atmospheric gases and particles. Aerosol Science and Technology 2005;39(11):1072-1084. R831074 (2005)
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  • Journal Article Takeuchi M, Rahmat Ullah SM, Dasgupta PK, Collins DR, Williams A. Continuous collection of soluble atmospheric particles with a wetted hydrophilic filter. Analytical Chemistry 2005;77(24):8031-8040. R831074 (2005)
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  • Journal Article Ullah SMR, Takeuchi M, Dasgupta PK. Versatile gas/particle ion chromatograph. Environmental Science & Technology 2006;40(3):962-968. R831074 (2006)
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  • Supplemental Keywords:

    aethalometry, ion chromatography, liquid chromatography, carbonaceous particles, atmospheric aerosols, oxidation to CO2, membrane transfer, contactless conductometry,, RFA, Health, Scientific Discipline, PHYSICAL ASPECTS, Air, Ecosystem Protection/Environmental Exposure & Risk, particulate matter, Air Quality, air toxics, Environmental Chemistry, Air Pollution Effects, Risk Assessments, Monitoring/Modeling, Analytical Chemistry, Environmental Monitoring, Physical Processes, Engineering, Chemistry, & Physics, Environmental Engineering, air quality modeling, health effects, particle size, carbon aerosols, atmospheric particulate matter, human health effects, PM 2.5, atmospheric particles, aerosol particles, mass spectrometry, ambient air monitoring, air quality models, exposure, air modeling, emissions, thermal desorption, molecular markers, gas chromatography, air sampling, carbon particles, air quality model, human exposure, ambient particle health effects, particulate matter mass, aethalometric liquid chromatographic mass spectrometry, aersol particles, monitoring of organic particulate matter, aerosol analyzers, human health risk, measurement methods

    Relevant Websites:

    http://www.uta.edu/chemistry/dasgupta.html Exit

    Progress and Final Reports:

    Original Abstract
  • 2004 Progress Report
  • 2005 Progress Report
  • 2007 Progress Report
  • 2008 Progress Report
  • Final Report