Grantee Research Project Results
2006 Progress Report: Aethalometric Liquid Chromatographic Mass Spectrometric Instrument
EPA Grant Number: R831074Title: 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 | ||
---|---|---|---|
|
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) |
Exit Exit Exit |
|
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) R831074 (2008) R831074 (Final) |
Exit Exit Exit |
|
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) |
Exit Exit Exit |
|
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) |
Exit Exit Exit |
|
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) R831074 (2007) R831074 (Final) |
Exit Exit Exit |
|
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) R831074 (2006) R831074 (2007) R831074 (Final) |
Exit Exit Exit |
|
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) R831074 (2006) R831074 (Final) |
Exit Exit Exit |
|
Ullah SMR, Takeuchi M, Dasgupta PK. Versatile gas/particle ion chromatograph. Environmental Science & Technology 2006;40(3):962-968. |
R831074 (2006) R831074 (2007) R831074 (Final) |
Exit Exit Exit |
Supplemental Keywords:
aethalometry, ion chromatography, liquid chromatography, carbonaceous particles, atmospheric aerosols, oxidation to CO2, membrane transfer, contactless conductometry,, RFA, Scientific Discipline, Health, PHYSICAL ASPECTS, Air, Ecosystem Protection/Environmental Exposure & Risk, particulate matter, Air Quality, air toxics, Environmental Chemistry, Air Pollution Effects, Monitoring/Modeling, Analytical Chemistry, Risk Assessments, Environmental Monitoring, Physical Processes, Engineering, Chemistry, & Physics, Environmental Engineering, carbon aerosols, air quality modeling, particle size, atmospheric particulate matter, health effects, aerosol particles, atmospheric particles, mass spectrometry, human health effects, ambient air monitoring, PM 2.5, air modeling, air quality models, exposure, air sampling, gas chromatography, thermal desorption, carbon particles, air quality model, emissions, molecular markers, particulate matter mass, human exposure, ambient particle health effects, aethalometric liquid chromatographic mass spectrometry, monitoring of organic particulate matter, aersol particles, particle dispersion, aerosol analyzers, measurement methodsRelevant Websites:
http://www.uta.edu/chemistry/dasgupta.html Exit
Progress and Final Reports:
Original AbstractThe perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.
Project Research Results
- Final Report
- 2008 Progress Report
- 2007 Progress Report
- 2005 Progress Report
- 2004 Progress Report
- Original Abstract
22 journal articles for this project