Record Display for the EPA National Library Catalog
RECORD NUMBER: 31 OF 136
|OLS Field Name||OLS Field Data|
|Main Title||Determination of rates of reaction in the gas-phase in the troposphere : theory and practice. 1. Hierachal test scheme. /|
|CORP Author||Environmental Protection Agency, Washington, DC. Office of Toxic Substances.|
|Publisher||U.S. Environmental Protection Agency, Office of Toxic Substances, Exposure Assessment Branch,|
|Subjects||Tropospheric chemistry--Mathematical models. ; Hydroxyl group--Environmental effects. ; Air--Pollution--Mathematical models.|
|Additional Subjects||Troposphere ; Reaction kinetics ; Photochemical reactions ; Air pollution ; Free radicals ; Solar radiation ; Gases ; Oxidation ; Ozone ; Numerical analysis ; Experimental design ; Atmospheric chemistry ; Hydroxyl radicals|
|Collation||28 pages ; 28 cm|
The document represents a detailed report on a two-tiered hierarchical test scheme for determining the rate constants k(dE), k(OH), and k(O3) (the second-order rate constants for direct photoreaction and indirect photoreaction with hydroxyl radicals and ozone, respectively) and estimating the half-lives (t(sub(1/2)E)) for each of these transformation processes and the net half-life in the gas-phase in the troposphere. The test scheme is organized so that estimation techniques are used as screening tests at the first level of testing followed by the laboratory methods as upper-tier tests. These screening tests give a rough estimate of the fate of a chemical in the gas-phase in the troposphere. Depending upon the results of these screening tests and the requirements in a risk-assessment, upper-tier laboratory tests should be used to obtain more detailed and reliable information to determine the fate of a chemical in the gas-phase in the troposphere.
"EPA 560/5-89-006." Includes bibliographical references. "Rate of indirect photoreaction: screening-level test guideline [section] 796.3800. Labooratory spectroscopic determination of the cross section and the maximum rate of direct photoreaction in sunlight." "November 1989." Microfiche.