Record Display for the EPA National Library Catalog


Main Title Laboratory Ecosystems for Studying Chemical Fate: An Evaluation Using Methyl Parathion.
Author Holm, Harvey W. ; Kollig, Heinz P. ; Proctor, Lita M. ; Payne, Jr, William R. ;
CORP Author Environmental Research Lab., Athens, GA.
Year Published 1982
Report Number EPA-600/3-82-020;
Stock Number PB82-231952
Additional Subjects Ecosystems ; Mathematical models ; Water pollution ; Stability ; Water chemistry ; Nutrients ; Sediments ; Microcosms ; Methyl parathion ; Exposure analysis modeling system
Library Call Number Additional Info Location Last
NTIS  PB82-231952 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 209p
The use of complex microcosms as tools for testing mathematical models of pollutant fate was evaluated by determining the transport and transformation of methyl parathion in two-8-compartment, continuous flow microcosms designed to enhance the effects of different degradation processes. Objectives were to develop different chemical and biological environments by adding inorganic nutrients, glycerol, contrived sediments, and natural sediments sequentially to compartments down the length of the channel; to determine whether the microcosms established stable states during the experimental periods; and to determine whether the fate of methyl parathion was related to environmental characteristics of each compartment. Observed differences in chemical treatments were reflected by differences in community structure and community function. Statistical comparisons of bacterial and total microbial biomass revealed significant differences; compartments with organic and inorganic nutrient additions were generally grouped separately from those with only inorganic nutrient additions. Relative rates of diurnal dissolved oxygen change were also significantly different between those compartments with different nutrient additions. Inclusion of natural and contrived sediments had few significant effects on the structure or function of the water or aufwuchs communities.