A Study of the Gas/Particle Partitioning of Chlorinated Dibenzodioxins (CDDs) and Chlorinated Dibenzofurans (CDFs) to Ambient and Model Aerosol MaterialsEPA Grant Number: R825376
Title: A Study of the Gas/Particle Partitioning of Chlorinated Dibenzodioxins (CDDs) and Chlorinated Dibenzofurans (CDFs) to Ambient and Model Aerosol Materials
Investigators: Pankow, James F.
Institution: Oregon Graduate Institute of Science & Technology
EPA Project Officer: Shapiro, Paul
Project Period: October 1, 1996 through September 30, 1999
Project Amount: $466,448
RFA: Exploratory Research - Air Engineering (1996) RFA Text | Recipients Lists
Research Category: Air Quality and Air Toxics , Land and Waste Management , Air , Engineering and Environmental Chemistry
EPA (1994b) has reaffirmed the toxicities of certain chlorinated dibenzodioxins (CDDs) and chlorinated dibenzofurans (CDFs), and has concluded that some in the population may already be experiencing associated health problems. Since 85% of the environmental load of these compounds is released to the atmosphere by incinerators and other sources, human exposure is due mainly to contamination of foods by atmospheric deposition from the gas (G) and particulate (P) phases. Since gases and particles deposit to surfaces at different rates, understanding how CDDs and CDFs partition between the G and P phases in the ambient atmosphere is very important (EPA, 1994b). This process also affects deposition to "Great Waters".
This project will provide a comprehensive study of how these toxic and difficult-to-work with compounds partition between the G and P phases in the atmosphere using three research components:
- "controlled field experiments" (CFEs), a new type of sampling experiment which will be held at constant T and RH, and conducted in several large cities ( Portland, Denver, Chicago) and one rural location (Tennessee) over a range of T and RH conditions;
- conventional high-volume filter/sorbent air sampling along with CFEs; and
- laboratory sorption experiments carried out using model atmospheric materials (quartz, graphitic carbon, ammonium sulfate, flyash, diesel particulate material, and NIST standard UPM) to provide theoretical guidance and general interpretive support.