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Related Concept Videos

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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Airborne Particulate Matter Size Distributions in an Arid Urban Area.

L Haller1, C Claiborn1, T Larson2

  • 1a Washington State University , Pullman , Washington , USA.

Journal of the Air & Waste Management Association (1995)
|January 14, 2017
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Summary

This study characterizes particulate matter (PM) in Spokane, WA, an area prone to dust storms. Findings reveal PM composition and size distributions, crucial for understanding local air quality and health impacts.

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Area of Science:

  • Environmental Science
  • Public Health
  • Atmospheric Chemistry

Background:

  • Limited data exists on health effects of particulate matter (PM) in dust storm-prone regions like Spokane, WA.
  • Understanding PM characteristics is vital for assessing environmental and health risks.
  • Atmospheric aerosols and their components require detailed investigation.

Purpose of the Study:

  • To characterize ambient particulate matter (PM) by particle size and chemical composition in Spokane, WA.
  • To investigate the health effects associated with exposure to atmospheric aerosols in a unique geographical area.
  • To provide baseline data on PM concentrations for a three-year study.

Main Methods:

  • Continuous tapered-element oscillating microbalances were used to measure PM concentrations.
  • Measurements were taken for three size ranges: PM10, PM2.5, and PM1.0.
  • Sampling was conducted at both a residential and an industrial site over 1.5 years.

Main Results:

  • PM10 averaged approximately 40-50% PM2.5 at industrial and residential sites, respectively.
  • Higher PM2.5 fractions within PM10 were observed in late fall/early winter (October-November).
  • PM2.5 was largely composed of particles ≤1.0 micrometer at the residential site; a single dust storm significantly enhanced PM10 and PM2.5 levels.

Conclusions:

  • Particulate matter composition varies significantly by location and season in Spokane.
  • The study provides critical data on PM size distribution relevant to health impact assessments.
  • Further research is needed to fully understand the health implications of Spokane's unique atmospheric aerosol environment.