Organization(s):

EPA logo US Environmental Protection Agency (EPA) / National Exposure Research Laboratories (NERL) / Human Exposure and Atmospheric Sciences Division (HEASD)


What does this program measure?

The EPA Sequential Fine Particle Sampler is a gaseous sampler that tests for metals and compounds in the air. It collects cations of Lithium, Sodium, Ammonium, Potassium, Magnesium, and Calcium and anions of Fluoride, Chloride, Nitrite, Bromide, Nitrate, Phosphate, and Sulfate.


How does this program work?

A URG automated sequential fine particle sampler (SFPS) collection system capable of collecting a minimum of seven days of gas and particulate samples without operator assistance. EPA-approved 47mm Teflon filters with unique identification numbers are stamped on the polypropylene support ring, and 242 mm multi-channel annular denuders are prepared, sampled, and analyzed in a manner consistent with EPA method IO-4. The filters are extracted in 5 ml of deionized water in a glove bag. The filter extract is introduced into a DIONEX ICS-90 ion chromatographic system for the quantification of major anions and cations. (e.g. halides).


Why is this research important?

The objective is to accumulate a long-term record of gas and fine (<2.5 µm) particulate halide chemistry to support atmospheric mercury chemistry research.

EPA SFPS Top Section(top section of SFPS, facing Mauna Kea)


Are there any trends in the data?


How does this program fit into the big picture?
What is it's role in global climate change?


Comments and References


Lead Investigator(s):

Dr Matthew S. Landis
919-541-4841


MLO Contact(s):

Aidan Colton
808-933-6965 (x233)
Alan M Yoshinaga
808-933-6965


Web Site(s)

http://www.epa.gov/
heasdweb/


Date Started

May 29, 2003


Related Programs

EPA Aethalometer
EPA Mercury Monitoring
EPA Mercury Precipitation
EPA Ambient Ion Monitor
EPA Dichotomous Partisol
EPA Sulfur Dioxoide
EPA Surface Ozone




Photographs:

EPA SFPS InstrumentSFPS sampler

EPA SFPS Instrument InteriorFilters and denuders

Denuders and Filters in LabDenuders and Filters in chem lab

Ion ChromatographIon Chromatograph in chem lab

IC drier and gasesIC gases and drier apparatus

Aidan Colton with SFPSAidan Colton with SFPS