Measurements of size- and time-resolved elemental concentrations at a California dairy farm

Yongjing Zhao, Steven S. Cliff, Anthony S. Wexler, Wasim Javed, Kevin Perry, Yuee Pan, Frank M. Mitloehner

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Airborne particulate matter with aerodynamic size less than 10μm was collected at a California dairy in fall 2006 using a Rotating Drum Impactor (RDI) sampler in 8 size ranges (i.e., 10-5, 5-2.5, 2.5-1.15, 1.15-0.75, 0.75-0.56, 0.56-0.34, 0.34-0.26, and 0.26-0.09μm). The RDI samples were analyzed using synchrotron X-ray Fluorescence (XRF) at the Advance Light Source (ALS), Lawrence National Berkeley Laboratory, to derive the concentrations of trace elements Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cu, Fe, Mn, and Zn. During this study, periods of rainfall in early November provided an opportunity to isolate particle emission sources. After the rainfalls, elemental concentrations decreased by about 80% for Mg, Al, Si, and Ti, 70% for Fe and Mn, 65% for Cu, and 60% for K and Ca. By contrast, the concentrations of the elements P, S, Zn and Cl did not decrease as significantly as others. Therefore, it is very likely that the dairy drylot corrals could be a major source of the elements Mg, Al, Si, K, Ca, Ti, Cu, Fe, and Mn under dry condition, but not of elements P, S, Zn and Cl. Elements Mg, Al, Si, K, Ca, Ti, Cu, Fe, and Mn were correlated with each other under both dry and wet conditions (R2 ranging from 0.47 to 0.99), indicating that they had common emission sources. Highly correlated sub-groups of elements shifted from dry to wet conditions, R2>0.96 among elements Mg, Al, and Si, R2>0.93 among elements K, Ca, Ti, Cu, Fe, and Mn under dry condition, and R2>0.87 among elements Mg, Al, Si, Ti, Fe, and Mn under wet condition, possibly due to the change in emission sources. Size distribution of the observed elements revealed (1) a general trend that elemental concentrations increased with particle size except for S, which had a peak at 1.15μm and (2) a greater portion of coarse elements (2.5-10μm) than fine elements (less than 2.5μm) for all elements except for S and Zn under both dry and wet conditions.

Original languageEnglish (US)
Pages (from-to)773-781
Number of pages9
JournalAtmospheric Environment
Volume94
DOIs
StatePublished - 2014

Fingerprint

rainfall
X-ray fluorescence
range size
sampler
aerodynamics
particulate matter
particle size
trace element
dairy farm
emission source
impactor
laboratory
trend
particle

Keywords

  • CAFO
  • Dairy
  • Elemental concentrations
  • RDI sampler
  • XRF

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)

Cite this

Zhao, Y., Cliff, S. S., Wexler, A. S., Javed, W., Perry, K., Pan, Y., & Mitloehner, F. M. (2014). Measurements of size- and time-resolved elemental concentrations at a California dairy farm. Atmospheric Environment, 94, 773-781. https://doi.org/10.1016/j.atmosenv.2014.06.011

Measurements of size- and time-resolved elemental concentrations at a California dairy farm. / Zhao, Yongjing; Cliff, Steven S.; Wexler, Anthony S.; Javed, Wasim; Perry, Kevin; Pan, Yuee; Mitloehner, Frank M.

In: Atmospheric Environment, Vol. 94, 2014, p. 773-781.

Research output: Contribution to journalArticle

Zhao, Y, Cliff, SS, Wexler, AS, Javed, W, Perry, K, Pan, Y & Mitloehner, FM 2014, 'Measurements of size- and time-resolved elemental concentrations at a California dairy farm', Atmospheric Environment, vol. 94, pp. 773-781. https://doi.org/10.1016/j.atmosenv.2014.06.011
Zhao, Yongjing ; Cliff, Steven S. ; Wexler, Anthony S. ; Javed, Wasim ; Perry, Kevin ; Pan, Yuee ; Mitloehner, Frank M. / Measurements of size- and time-resolved elemental concentrations at a California dairy farm. In: Atmospheric Environment. 2014 ; Vol. 94. pp. 773-781.
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N2 - Airborne particulate matter with aerodynamic size less than 10μm was collected at a California dairy in fall 2006 using a Rotating Drum Impactor (RDI) sampler in 8 size ranges (i.e., 10-5, 5-2.5, 2.5-1.15, 1.15-0.75, 0.75-0.56, 0.56-0.34, 0.34-0.26, and 0.26-0.09μm). The RDI samples were analyzed using synchrotron X-ray Fluorescence (XRF) at the Advance Light Source (ALS), Lawrence National Berkeley Laboratory, to derive the concentrations of trace elements Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cu, Fe, Mn, and Zn. During this study, periods of rainfall in early November provided an opportunity to isolate particle emission sources. After the rainfalls, elemental concentrations decreased by about 80% for Mg, Al, Si, and Ti, 70% for Fe and Mn, 65% for Cu, and 60% for K and Ca. By contrast, the concentrations of the elements P, S, Zn and Cl did not decrease as significantly as others. Therefore, it is very likely that the dairy drylot corrals could be a major source of the elements Mg, Al, Si, K, Ca, Ti, Cu, Fe, and Mn under dry condition, but not of elements P, S, Zn and Cl. Elements Mg, Al, Si, K, Ca, Ti, Cu, Fe, and Mn were correlated with each other under both dry and wet conditions (R2 ranging from 0.47 to 0.99), indicating that they had common emission sources. Highly correlated sub-groups of elements shifted from dry to wet conditions, R2>0.96 among elements Mg, Al, and Si, R2>0.93 among elements K, Ca, Ti, Cu, Fe, and Mn under dry condition, and R2>0.87 among elements Mg, Al, Si, Ti, Fe, and Mn under wet condition, possibly due to the change in emission sources. Size distribution of the observed elements revealed (1) a general trend that elemental concentrations increased with particle size except for S, which had a peak at 1.15μm and (2) a greater portion of coarse elements (2.5-10μm) than fine elements (less than 2.5μm) for all elements except for S and Zn under both dry and wet conditions.

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