STP558

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

    Published: Jan 1974


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    Abstract

    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.

    Keywords:

    corrosion, test chambers, air pollution, sulfur dioxide, nitrogen dioxide, and ozone, materials, damage, statistical tests, factorials positioning


    Author Information:

    Spence, JW
    Research chemist and chief, Chemistry and Physics Laboratory, Environmental Protection Agency, National Environmental Research Center, Research Triangle Park, N. C.

    Haynie, FH
    Research chemist and chief, Chemistry and Physics Laboratory, Environmental Protection Agency, National Environmental Research Center, Research Triangle Park, N. C.


    Paper ID: STP32168S

    Committee/Subcommittee: G01.04

    DOI: 10.1520/STP32168S


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