2003 Progress Report: Development of a Real-Time Monitoring System for Acidity and Soluble Components in Airborne Particulate Matter

EPA Grant Number: R827351C015
Subproject: this is subproject number 015 , established and managed by the Center Director under grant R827351
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).

Center: EPA NYU PM Center: Health Risks of PM Components
Center Director: N/A
Title: Development of a Real-Time Monitoring System for Acidity and Soluble Components in Airborne Particulate Matter
Investigators: Xiong, Judy Q. , Chen, Lung Chi
Institution: New York University School of Medicine
EPA Project Officer: Chung, Serena
Project Period: June 1, 1999 through May 31, 2004
Project Period Covered by this Report: June 1, 2002 through May 31, 2003
RFA: Airborne Particulate Matter (PM) Centers (1999) RFA Text |  Recipients Lists
Research Category: Air Quality and Air Toxics , Particulate Matter , Air


The objective of this research project is to develop a real-time monitoring system for acidity and soluble components in airborne fine particulate matter (PM).

This is one of the projects funded by the New York University (NYU) PM Center. The progress for the other projects is reported separately (see reports for R827351C001 through R827351C014, and R827351C016).

Progress Summary:

Development of the PM Soluble Contents Sampler

A miniature PM soluble Contents Sampler (PMSCS) has been designed and fabricated based on the principle of the Multi-Orifice Impinger developed by Xiong and Fang (1998). The system has been assembled into the CAPS-Animal Exposure system that currently is used in the NYU PM Center for mouse inhalation studies and has replaced the Biosampler line for the collection of wet concentrated ambient particles (CAPs) samples since February 25, 2004. A backup filter (37mm Teflo membrane filter, Gelman) is installed at the downstream of the sampler for verification of the particle collection efficiency by the sampler.

The experimental data demonstrated that the sampler is able to:

  • Interface with the CAPs-Animal Exposure system without disturbing the overall system setup and operation conditions.
  • Efficiently collect and transport airborne PM into the liquid phase with a collection efficiency near 100 percent for wet CAPs.
  • Collect wet CAPs samples continuously in a preset time interval (as low as in 15 minutes, Figure 1) for monitoring mass concentration of PM soluble inorganic components (SO4=, NO3-, Cl-, F-, NH4+, Na+, K+, etc.) via ionic analyses by a Conductometric Ion chromatography (IC) system (Dionex 500).
  • Be readily upgraded to a real-time monitoring system with an interfaced IC and automated by a personal computer equipped with Labview software.

Data Comparison

The PMSCS-IC monitoring data for the mass concentrations of major CAPs soluble inorganic components (i.e., anions SO4=, NO3- and cations NH4+) has been coupled with the particle mass and number concentration data time series monitored at the two parallel concentrator lines by RAM and CNC, respectively. (There was no particle mass and number concentration previously in the Biosampler line.)

The results show that there are the fairly good correlations between the mass concentrations of particulate sulfate, nitrate, and ammonium contents with the particle mass concentration (Figure 1); however, there were no correlations between these contents and particle number concentration.

Future Activities:

An effort is underway for further development of a system for continuously monitoring CAPs acidity (H+) based on the method developed by Ito, et. al. (1998), which measures total anion equivalents and non-H+ cation equivalents via suppressed and then deduces aerosol H+ from the difference of the total anion and non-H+ cation equivalents.

Supplemental Keywords:

thoracic particles, PM10, fine particles, PM2.5, ultrafine particles, PM 0.1, lung dosimetry models, human exposure models, pulmonary responses, cardiovascular responses, immunological responses, criteria air pollutants, concentrated ambient aerosols, aerosol, air pollutants, air pollution, airborne pollutants, airway disease, airway inflammation, airway variability, allergen, ambient air, ambient air quality, analytical chemistry, assessment of exposure, asthma, asthma morbidity, atmospheric monitoring, biological markers, childhood respiratory disease, children, combustion, combustion contaminants, combustion emissions, compliance monitoring, dosimetry, epidemiology, exposure, exposure and effects, health effects, heart rate variability, human exposure, human health, human health effects, incineration, lead, lung, mercury, morbidity, particulates, pulmonary, pulmonary disease, respiratory, RFA, Scientific Discipline, Air, Ecosystem Protection/Environmental Exposure & Risk, particulate matter, air toxics, Environmental Chemistry, Air Pollution Effects, Monitoring/Modeling, Environmental Monitoring, Atmospheric Sciences, Ecology and Ecosystems, Environmental Engineering, atmospheric particulate matter, health effects, particulate organic carbon, atmospheric dispersion models, atmospheric measurements, model-based analysis, aerosol particles, chemical characteristics, emissions monitoring, environmental measurement, air quality models, airborne particulate matter, air sampling, air quality model, emissions, diesel exhaust, particulate matter mass, aersol particles, modeling studies, real-time monitoring, aerosol analyzers, measurement methods, chemical speciation sampling, particle size measurement

Relevant Websites:

http://www.med.nyu.edu/environmental/centers/epa/ Exit

Progress and Final Reports:

Original Abstract
  • 1999
  • 2000
  • 2001
  • 2002
  • Final

  • Main Center Abstract and Reports:

    R827351    EPA NYU PM Center: Health Risks of PM Components

    Subprojects under this Center: (EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
    R827351C001 Exposure Characterization Error
    R827351C002 X-ray CT-based Assessment of Variations in Human Airway Geometry: Implications for Evaluation of Particle Deposition and Dose to Different Populations
    R827351C003 Asthma Susceptibility to PM2.5
    R827351C004 Health Effects of Ambient Air PM in Controlled Human Exposures
    R827351C005 Physicochemical Parameters of Combustion Generated Atmospheres as Determinants of PM Toxicity
    R827351C006 Effects of Particle-Associated Irritants on the Cardiovascular System
    R827351C007 Role of PM-Associated Transition Metals in Exacerbating Infectious Pneumoniae in Exposed Rats
    R827351C008 Immunomodulation by PM: Role of Metal Composition and Pulmonary Phagocyte Iron Status
    R827351C009 Health Risks of Particulate Matter Components: Center Service Core
    R827351C010 Lung Hypoxia as Potential Mechanisms for PM-Induced Health Effects
    R827351C011 Urban PM2.5 Surface Chemistry and Interactions with Bronchoalveolar Lavage Fluid (BALF)
    R827351C012 Subchronic PM2.5 Exposure Study at the NYU PM Center
    R827351C013 Long Term Health Effects of Concentrated Ambient PM2.5
    R827351C014 PM Components and NYC Respiratory and Cardiovascular Morbidity
    R827351C015 Development of a Real-Time Monitoring System for Acidity and Soluble Components in Airborne Particulate Matter
    R827351C016 Automated Real-Time Ambient Fine PM Monitoring System