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A Scalable Field Study Protocol and Rationale for Passive Ambient Air Sampling: A Spatial Phytosampling for Leaf Data
Tonny J Oyana1,2, Slawomir M Lomnicki1, Chuqi Guo1
1Department of Environmental Sciences, Louisiana State University , Baton Rouge, Louisiana 70803, United States.
Environmental Science & Technology
|August 15, 2017
Summary
Environmentally persistent free radicals (EPFRs) on airborne fine particulate matter (PM2.5) were measured using a novel plant-based sampling method. This approach identified spatial variations and potential exposure hotspots in Memphis.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Public Health
Background:
- Environmentally persistent free radicals (EPFRs) are found on airborne fine particulate matter (PM2.5).
- EPFRs originate from combustion and vehicular exhaust, persisting in the environment and biological systems.
- Current measurement methods using high-volume samplers limit representativeness of community exposure.
Purpose of the Study:
- To develop and validate a novel spatial phytosampling methodology for studying EPFR concentrations in PM2.5.
- To investigate the spatial distribution patterns of EPFRs in airborne PM2.5 across Memphis, Tennessee.
- To identify potential EPFR exposure hotspots and inform demographic health studies.
Main Methods:
- Phytosampling: Leaf samples collected from 188 random sites within a 500-m buffer zone of pollution sources.
- PM Isolation and Fractionation: Particulate matter isolated from intact leaves and size-fractionated.
- EPFR Quantification: Electron paramagnetic resonance (EPR) spectroscopy used to quantify EPFRs on PM.
Main Results:
- A novel spatial phytosampling method was successfully developed for EPFR analysis in PM2.5.
- Spatial variations in EPFR concentrations were identified across the Memphis sampling grid.
- Radical concentration positively correlated with the EPFR g-value, indicating higher oxygen-centered radical content.
Conclusions:
- Spatial phytosampling provides a valuable approach to assess EPFR exposure patterns.
- The study identified potential EPFR exposure hotspots in Memphis.
- This method offers insights for health studies investigating exposure and demographic differences.
