Chemical Characteristics of PM<sub>10</sub>Aerosols Collected in the Los Angeles Area

Solomon, Paul A.; Fall, Theresa; Salmon, Lynn G.; Cass, Glen R.; Gray, H. Andrew; Davidson, Arthur J.

doi:10.1080/08940630.1989.10466515

Cited by 65 publications

(73 citation statements)

References 11 publications

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“…11 These results do not imply that the SSI HiVol method does not lose any ammonium nitrate, but they do suggest that the TEOM does not retain any of this semi-volatile PM component.…”

Section: Discussionmentioning

confidence: 59%

“…Rubidoux has relatively high concentrations of ammonium nitrate. 10,11 Most of the difference between the PM 10 methods at the Rubidoux site can be accounted for on a sample-by-sample basis by the measured amount of ammonium nitrate on the SSI HiVol filter. To demonstrate this, the ammonium nitrate concentration measured on the SSI filter was added to the PM 10 concentration measured with the TEOM, and the sum was plotted against the PM 10 concentration of the SSI sampler.…”

Section: Discussionmentioning

confidence: 99%

“…It has historically had high levels of PM 10 and ammonium nitrate. 10,11 Long Beach, CA, (LB) is adjacent to and south of Los Angeles. It is a coastal area, and subject to both the Los Angeles urban plume and marine air influences.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of the TEOM^® Method for Measurement of Ambient Particulate Mass in Urban Areas

Allen

Sioutas

Koutrakis

et al. 1997

Journal of the Air & Waste Management Association

252

138

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IMPLICATIONSSemi-volatile organic and inorganic compounds can represent a substantial fraction of ambient particulate mass. Loss of semi-volatile compounds during filter collection can occur due to changes in the composition of the air sample. Heating of the air sample to a temperature 10-20 °C above ambient to remove particle-bound water can further enhance loss of the semi-volatile constituents of ambient particles. These losses depend on particle composition, which varies with location and time. Thus, it is not possible to determine the true concentration by using empirical factors to correct the observed concentrations. Therefore, to minimize losses of semi-volatile compounds, we recommend that particle mass measurements be made at temperatures comparable to ambient. In urban areas, a substantial fraction of ambient PM can be semi-volatile material. A larger fraction of this component of PM 10 may be lost from the TEOM-heated filter than the Federal Reference Method (FRM). The observed relationship between TEOM and FRM methods varied widely among sites and seasons. In East Coast urban areas during the summer, the methods were highly correlated with good agreement. In the winter, correlation was somewhat lower, with TEOM PM concentrations generally lower than the FRM. Rubidoux, CA, and two Mexican sites (Tlalnepantla and Merced) had the highest levels of PM 10 and the largest difference between TEOM and manual methods.PM 2.5 data from collocation of 24-hour manual samples with the TEOM are also presented. As most of the semi-volatile PM is in the fine fraction, differences between these methods are larger for PM 2.5 than for PM 10 .

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“…11 These results do not imply that the SSI HiVol method does not lose any ammonium nitrate, but they do suggest that the TEOM does not retain any of this semi-volatile PM component.…”

Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of the TEOM^® Method for Measurement of Ambient Particulate Mass in Urban Areas

Allen

Sioutas

Koutrakis

et al. 1997

Journal of the Air & Waste Management Association

252

138

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“…Of the different California air basins, PM,, chemical characteristics have only been extensively studied in the Los Angeles (L.A.) region (Gray et al, 1988;Solomon et al, 1989Solomon et al, , 1992Chow et al, 19928. The highest PM!, mass and chemical compositions are slmilar in the SJV and in the SoCAB.…”

Section: Comparisons With the Los Angeles Air Basin Aerosolmentioning

confidence: 99%

PM₁₀and PM_2.5Compositions in California's San Joaquin Valley

Chow

Watson

Lowenthal

et al. 1993

Aerosol Science and Technology

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191

110

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PM,, (particles < 10 y m in aerodynamic diameter) and PM,,, (particles < 2.5 y m in aerodynamic diameter) mass, elements, water-soluble nitrate, sulfate, ammonium, sodium, potassium, and organic and elemental carbon were determined in 24-h aerosol samples collected during this period. Federal and state standards for PM,, were exceeded a t both urban and nonurhan sites. PM,, concentrations were generally highest during winter and were dominated by PM,, during this time. The coarse (PM1, minus PM,.,) aerosol fraction constituted more than half of PM,, mass during the summer and fall.PM,, concentrations of secondary ammonium nitrate were elevated during the winter a t all sites. Conversely, concentrations of coarse particle iron, indicative of geologically related dust, were higher under less humid conditions during the summer and fall. Regionwide meteorological and chemical transformation processes influence the secondary (nitrate and sulfate) components of PM,,. Elevated concentrations of coarse-particle dust, however, appear to originate from local emissions, such as agricultural and transportation-related activities, as well as region-wide emissions.

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“…L. M. Hildemann et al Much work has been done to quantify the variation in the total mass of particulate phase organics present in the Los Angeles atmosphere as a function of location and time of year. Winter maxima and summer minima have been observed in organic aerosol concentrations for the near-coastal sites (Gray et al, 1984;Gray, 1986;Solomon et al, 1989), whereas sites further inland have shown little seasonal variation in particulate-phase organics (Gray, 1986;Gray et al, 1984;Solomon et al, 1989). Because the seasonal patterns observed for these organic aerosols are quite similar to those seen for fine particulate elemental carbon (Gray et al, 1984;Gray, 1986), meteorology is considered to be a significant contributor to the site-dependent seasonal trends.…”

Section: Introductionmentioning

confidence: 64%

Seasonal Trends in Los Angeles Ambient Organic Aerosol Observed by High-Resolution Gas Chromatography

Hildemann

Mazurek

Cass

et al. 1994

Aerosol Science and Technology

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Chemical Characteristics of PM₁₀Aerosols Collected in the Los Angeles Area

Cited by 65 publications

References 11 publications

Evaluation of the TEOM^® Method for Measurement of Ambient Particulate Mass in Urban Areas

Evaluation of the TEOM^® Method for Measurement of Ambient Particulate Mass in Urban Areas

PM₁₀and PM_2.5Compositions in California's San Joaquin Valley

Seasonal Trends in Los Angeles Ambient Organic Aerosol Observed by High-Resolution Gas Chromatography

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Chemical Characteristics of PM10Aerosols Collected in the Los Angeles Area

Cited by 65 publications

References 11 publications

Evaluation of the TEOM® Method for Measurement of Ambient Particulate Mass in Urban Areas

Evaluation of the TEOM® Method for Measurement of Ambient Particulate Mass in Urban Areas

PM10and PM2.5Compositions in California's San Joaquin Valley

Seasonal Trends in Los Angeles Ambient Organic Aerosol Observed by High-Resolution Gas Chromatography

Contact Info

Product

Resources

About

Chemical Characteristics of PM₁₀Aerosols Collected in the Los Angeles Area

Evaluation of the TEOM^® Method for Measurement of Ambient Particulate Mass in Urban Areas

Evaluation of the TEOM^® Method for Measurement of Ambient Particulate Mass in Urban Areas

PM₁₀and PM_2.5Compositions in California's San Joaquin Valley