Grantee Research Project Results

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: Particulate Matter , Air Quality and Air Toxics , Air

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

Publications Views
Other project views:	All 46 publications	22 publications in selected types	All 22 journal articles

Publications
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)	Full-text: ScienceDirect-Full-text HTML Exit Abstract: ScienceDirect-Abstract Exit Other: ScienceDirect-Full-text PDF Exit
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) R831074 (2008) R831074 (Final)	Full-text: Science Direct-Full Text HTML Exit Abstract: Science Direct-Abstract Exit Other: Science Direct-Full Text PDF Exit
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)	Full-text: Science Direct-Full Text HTML Exit Abstract: ScienceDirect-Abstract Exit Other: ScienceDirect-Full Text PDF Exit
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)	Full-text: Science Direct-Full Text HTML Exit Abstract: ScienceDirect-Abstract Exit Other: Science Direct-Full Text PDF Exit
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) R831074 (2007) R831074 (Final)	Full-text: ScienceDirect-Full Text HTML Exit Abstract: ScienceDirect-Abstract Exit Other: ScienceDirect-Full Text PDF Exit
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) R831074 (2006) R831074 (2007) R831074 (Final)	Full-text: Informaworld-Full Text HTML Exit Abstract: Informaworld-Abstract Exit Other: Informaworld-Full Text PDF Exit
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) R831074 (2006) R831074 (Final)	Abstract from PubMed Full-text: ACS Publications-Full Text HTML Exit Abstract: ACS Publications-Abstract Exit Other: ACS Publications-Full Text PDF Exit
Journal Article	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)	Abstract from PubMed Full-text: ES&T-Full Text HTML Exit Abstract: ES&T-Abstract Exit Other: ES&T-Full Text PDF Exit

Supplemental Keywords:

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

Relevant Websites:

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

Progress and Final Reports:

Original Abstract

The 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.