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Related Experiment Videos

Particulate nitrate measurement using nylon filters.

Xiao-Ying Yu1, Taehyoung Lee, Benjamin Ayres

  • 1Department of Atmospheric Science, Colorado State University, Fort Collins, CO, USA.

Journal of the Air & Waste Management Association (1995)
|September 29, 2005
PubMed
Summary

Deionized water effectively extracts nitrate and sulfate from nylon filters, matching the efficiency of basic solutions. This finding supports using deionized water in aerosol monitoring, simplifying analysis by avoiding sodium ion interference.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Atmospheric Science

Background:

  • Nylon filters are widely used in aerosol monitoring networks like EPA and IMPROVE for collecting atmospheric fine particles.
  • Traditional extraction methods use basic aqueous solutions, but a shift towards deionized water is occurring to prevent sodium ion interference in analyses.
  • Previous research highlighted the need for basic solutions for efficient gaseous nitric acid extraction from nylon filters.

Purpose of the Study:

  • To investigate the efficiency of deionized water for extracting aerosol nitrate and sulfate from nylon filters.
  • To compare deionized water extraction with traditional basic solution extraction methods.
  • To assess the suitability of deionized water for routine aerosol monitoring analyses.

Main Methods:

Related Experiment Videos

  • Conducted five field experiments at selected Interagency Monitoring of Protected Visual Environments (IMPROVE) sites.
  • Collected atmospheric fine particles on nylon filters.
  • Extracted nitrate and sulfate using both deionized water (with ultrasonication) and a basic solution (1.7 mM sodium bicarbonate and 1.8 mM sodium carbonate).
  • Compared extraction efficiencies between the two methods.

Main Results:

  • Nylon filters demonstrated superior retention of collected fine particle nitrate compared to Teflon filters.
  • Deionized water extraction, particularly with ultrasonication, proved as efficient as basic solution extraction for nitrate and sulfate under the studied conditions.
  • The efficiency of deionized water extraction was comparable to that of the basic solution for both nitrate and sulfate.

Conclusions:

  • Deionized water is an effective extraction medium for nitrate and sulfate from nylon filters in aerosol monitoring.
  • The use of deionized water simplifies inorganic ion analysis by eliminating sodium ion interference.
  • Findings support the adoption of deionized water extraction in aerosol monitoring programs utilizing nylon filters.