SYMPOSIA PAPER Published: 01 January 1974
STP32168S

Design of a Laboratory Experiment to Identify the Effects of Environmental Pollutants on Materials

Source

This paper describes an environmental system consisting of five exposure chambers and an experimental design for studying the effects of gaseous air pollutants [sulfur dioxide (S02), nitrogen dioxide (N02), and ozone (03)] on materials. Each chamber has the means for independent control of six environmental variables (temperature, relative humidity, etc.) as well as the unique feature of chill racks that regulate the formation of dew on the test specimens. An accelerated test is achieved by a dew-light (xenon lamp) cycle to simulate diurnal conditions. Statistical techniques (analysis of variance) were used to correct for differences in light and pollutant distribution within the chambers before initiating a statistically designed environmental experiment. To study the interactions of pollutants and other environmental variables that are likely to have significant effects on materials, a two-level factorial arrangement was selected.

Author Information

Spence, JW
Chemistry and Physics Laboratory, Environmental Protection Agency, National Environmental Research Center, Research Triangle Park, N. C.
Haynie, FH
Chemistry and Physics Laboratory, Environmental Protection Agency, National Environmental Research Center, Research Triangle Park, N. C.
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Details
Developed by Committee: G01
Pages: 279–291
DOI: 10.1520/STP32168S
ISBN-EB: 978-0-8031-4644-0
ISBN-13: 978-0-8031-0315-3