||Determination of rates of reaction in the gas-phase in the troposphere : theory and practice. 1. Hierachal test scheme. /
||Environmental Protection Agency, Washington, DC. Office of Toxic Substances.
|| U.S. Environmental Protection Agency, Office of Toxic Substances, Exposure Assessment Branch,
Tropospheric chemistry--Mathematical models. ;
Hydroxyl group--Environmental effects. ;
Reaction kinetics ;
Photochemical reactions ;
Air pollution ;
Free radicals ;
Solar radiation ;
Numerical analysis ;
Experimental design ;
Atmospheric chemistry ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||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.
||Washington, DC :
|Corporate Au Added Ent
||United States. Environmental Protection Agency. Office of Pollution Prevention and Toxics.
|PUB Date Free Form
||PC A03/MF A01
|OCLC Time Stamp
|OCLC Rec Leader
||01452nam 2200301Ka 45020