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PM2.5 source apportionment with organic markers in the Southeastern Aerosol Research and Characterization (SEARCH) study.
J Air Waste Manag Assoc 2015; 65(9):1104-18JA

Abstract

Positive matrix factorization (PMF) and effective variance (EV) solutions to the chemical mass balance (CMB) were applied to PM(2.5) (particulate matter with an aerodynamic diameter <2.5 μm) mass and chemically speciated measurements for samples taken from 2008 to 2010 at the Atlanta, Georgia, and Birmingham, Alabama, sites. Commonly measured PM(2.5) mass, elemental, ionic, and thermal carbon fraction concentrations were supplemented with detailed nonpolar organic speciation by thermal desorption-gas chromatography/mass spectrometry (TD-GC/MS). Source contribution estimates were calculated for motor vehicle exhaust, biomass burning, cooking, coal-fired power plants, road dust, vegetative detritus, and secondary sulfates and nitrates for Atlanta. Similar sources were found for Birmingham, with the addition of an industrial source and the separation of biomass burning into open burning and residential wood combustion. EV-CMB results based on conventional species were qualitatively similar to those estimated by PMF-CMB. Secondary ammonium sulfate was the largest contributor, accounting for 27-38% of PM(2.5), followed by biomass burning (21-24%) and motor vehicle exhaust (9-24%) at both sites, with 4-6% of PM(2.5) attributed to coal-fired power plants by EV-CMB. Including organic compounds in the EV-CMB reduced the motor vehicle exhaust and biomass burning contributions at both sites, with a 13-23% deficit for PM(2.5) mass. The PMF-CMB solution showed mixing of sources within the derived factors, both with and without the addition of speciated organics, as is often the case with complex source mixtures such as those at these urban-scale sites. The nonpolar TD-GC/MS compounds can be obtained from existing filter samples and are a useful complement to the elements, ions, and carbon fractions. However, they should be supplemented with other methods, such as TD-GC/MS on derivitized samples, to obtain a wider range of polar compounds such as sterols, sugars, and organic acids. The PMF and EV solutions to the CMB equations are complementary to, rather than replacements for, each other, as comparisons of their results reveal uncertainties that are not otherwise evident.

IMPLICATIONS

Organic markers can be measured on currently acquired PM(2.5) filter samples by thermal methods. These markers can complement element, ion, and carbon fraction measurements from long-term speciation networks. Applying the positive matrix factorization and effective variance solutions for the chemical mass balance equations provides useful information on the accuracy of the source contribution estimates. Nonpolar compounds need to be complemented with polar compounds to better apportion cooking and secondary organic aerosol contributors.

Authors+Show Affiliations

a Division of Atmospheric Sciences , Desert Research Institute, Nevada System of Higher Education , Reno , NV , USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26102211

Citation

Watson, John G., et al. "PM2.5 Source Apportionment With Organic Markers in the Southeastern Aerosol Research and Characterization (SEARCH) Study." Journal of the Air & Waste Management Association (1995), vol. 65, no. 9, 2015, pp. 1104-18.
Watson JG, Chow JC, Lowenthal DH, et al. PM2.5 source apportionment with organic markers in the Southeastern Aerosol Research and Characterization (SEARCH) study. J Air Waste Manag Assoc. 2015;65(9):1104-18.
Watson, J. G., Chow, J. C., Lowenthal, D. H., Antony Chen, L. W., Shaw, S., Edgerton, E. S., & Blanchard, C. L. (2015). PM2.5 source apportionment with organic markers in the Southeastern Aerosol Research and Characterization (SEARCH) study. Journal of the Air & Waste Management Association (1995), 65(9), pp. 1104-18. doi:10.1080/10962247.2015.1063551.
Watson JG, et al. PM2.5 Source Apportionment With Organic Markers in the Southeastern Aerosol Research and Characterization (SEARCH) Study. J Air Waste Manag Assoc. 2015;65(9):1104-18. PubMed PMID: 26102211.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - PM2.5 source apportionment with organic markers in the Southeastern Aerosol Research and Characterization (SEARCH) study. AU - Watson,John G, AU - Chow,Judith C, AU - Lowenthal,Douglas H, AU - Antony Chen,L-W, AU - Shaw,Stephanie, AU - Edgerton,Eric S, AU - Blanchard,Charles L, PY - 2015/6/24/entrez PY - 2015/6/24/pubmed PY - 2015/12/19/medline SP - 1104 EP - 18 JF - Journal of the Air & Waste Management Association (1995) JO - J Air Waste Manag Assoc VL - 65 IS - 9 N2 - UNLABELLED: Positive matrix factorization (PMF) and effective variance (EV) solutions to the chemical mass balance (CMB) were applied to PM(2.5) (particulate matter with an aerodynamic diameter <2.5 μm) mass and chemically speciated measurements for samples taken from 2008 to 2010 at the Atlanta, Georgia, and Birmingham, Alabama, sites. Commonly measured PM(2.5) mass, elemental, ionic, and thermal carbon fraction concentrations were supplemented with detailed nonpolar organic speciation by thermal desorption-gas chromatography/mass spectrometry (TD-GC/MS). Source contribution estimates were calculated for motor vehicle exhaust, biomass burning, cooking, coal-fired power plants, road dust, vegetative detritus, and secondary sulfates and nitrates for Atlanta. Similar sources were found for Birmingham, with the addition of an industrial source and the separation of biomass burning into open burning and residential wood combustion. EV-CMB results based on conventional species were qualitatively similar to those estimated by PMF-CMB. Secondary ammonium sulfate was the largest contributor, accounting for 27-38% of PM(2.5), followed by biomass burning (21-24%) and motor vehicle exhaust (9-24%) at both sites, with 4-6% of PM(2.5) attributed to coal-fired power plants by EV-CMB. Including organic compounds in the EV-CMB reduced the motor vehicle exhaust and biomass burning contributions at both sites, with a 13-23% deficit for PM(2.5) mass. The PMF-CMB solution showed mixing of sources within the derived factors, both with and without the addition of speciated organics, as is often the case with complex source mixtures such as those at these urban-scale sites. The nonpolar TD-GC/MS compounds can be obtained from existing filter samples and are a useful complement to the elements, ions, and carbon fractions. However, they should be supplemented with other methods, such as TD-GC/MS on derivitized samples, to obtain a wider range of polar compounds such as sterols, sugars, and organic acids. The PMF and EV solutions to the CMB equations are complementary to, rather than replacements for, each other, as comparisons of their results reveal uncertainties that are not otherwise evident. IMPLICATIONS: Organic markers can be measured on currently acquired PM(2.5) filter samples by thermal methods. These markers can complement element, ion, and carbon fraction measurements from long-term speciation networks. Applying the positive matrix factorization and effective variance solutions for the chemical mass balance equations provides useful information on the accuracy of the source contribution estimates. Nonpolar compounds need to be complemented with polar compounds to better apportion cooking and secondary organic aerosol contributors. SN - 1096-2247 UR - https://www.unboundmedicine.com/medline/citation/26102211/PM2_5_source_apportionment_with_organic_markers_in_the_Southeastern_Aerosol_Research_and_Characterization__SEARCH__study_ L2 - http://www.tandfonline.com/doi/full/10.1080/10962247.2015.1063551 DB - PRIME DP - Unbound Medicine ER -