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 Instrument
SFPS sampler
EPA SFPS Instrument Interior
Filters and denuders
Denuders and Filters in Lab
Denuders and Filters in chem lab
Ion Chromatograph
Ion Chromatograph in chem lab
IC drier and gases
IC gases and drier apparatus
Aidan Colton with SFPS
Aidan Colton with SFPS