Record Display for the EPA National Library Catalog

RECORD NUMBER: 4 OF 13

OLS Field Name OLS Field Data
Main Title Development of a Fate/Toxicity Screening Test.
Author Walker, W. W. ;
CORP Author Gulf Coast Research Lab., Ocean Springs, MS.;Environmental Research Lab., Gulf Breeze, FL.
Year Published 1984
Report Number EPA/600/4-84/074;
Stock Number PB84-246370
Additional Subjects Toxicity ; Degradation ; Reaction kinetics ; Experimental design ; Pesticides ; Environmental surveys ; Tests ; Sediments ; Water ; Half life ; Sampling ; Sites ; Parathion/methyl ; Bolero ; Bravo ; Dimilin ; Dursban ; Endosulfan ; Hoelon ; Benzene/pentachloro ; Phorate ; Trifluralin ; Phthalic acid/(dibutyl-ester)
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB84-246370 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 39p
Abstract
A shake-flask screening test was designed to rapidly evaluate the relative degradation rates of a wide spectrum of chemicals, each compared to methyl parathion. Test chemicals evaluated were bolero, bravo, dibutylphthalate, dimilin, dursban, endosulfan, hoelon, pentachlorobenzene, phorate, and trifluralin. Diverse regimes of salinity, pH, TOC, and microbial biomass were encountered across space and time. The experimental design for the screening test embodies four treatments: active sediment, sterile sediment, active water and sterile water. Decay curves were produced and rate constants and half-life values determined. Half-life values for the 10 chemicals evaluated varied substantially with time and geographic sampling site. In active systems, 8 of the 10 chemicals degraded more rapidly than methyl parathion. Nine dibutylphthalate screens were run involving six geographic sites. Disappearance was quite rapid in active treatments in all screens. Disappearance curves describing DBP abatement either: (1) appeared to be substrate dependent with the rate of degradation decreasing as DBP was depleted; (2) appeared independent of substrate concentration; or (3) reflected a marked increase in degradation rate during the screening period.