Record Display for the EPA National Library Catalog


Main Title Microbial Degradation of Seven Amides by Suspended Bacterial Populations.
Author Steen, W. C. ; Collette, T. W. ;
CORP Author Environmental Research Lab., Athens, GA. Office of Research and Development.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/247;
Stock Number PB90-135468
Additional Subjects Biodeterioration ; Water microbiology ; Amides ; Infrared spectroscopy ; Hydrolysis ; Molecular structure ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB90-135468 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 7p
Microbial transformation rate constants were determined for seven amides in natural pond water. A second-order mathematical rate expression served as the model for describing the microbial transformation. Also investigated was the relationship between the infrared spectra and the second-order rate constants for these amides. Second-order rate constants (k2) ranged from a low of 2.0 x 10(-14) to a high of 1.1 x 10(-9) liters/organism/h for niclosamide (2',5-dichloro-4'-nitrosalicylanilide) and propachlor (2-chloro-N-isopropylacetanilide), respectively. The mechanism of degradation (i.e., microbially mediated hydrolysis) of the amides was consistent with that of other organic chemicals previously studied in a variety of natural waters. Preliminary investigations indicate that temporal variations in measured second-order rate constants are small. A simple linear regression of the infrared carbonyl-stretching frequency with log k2 gave a correlation coefficient (r2) of 0.962. (Copyright (c) 1989 American Society for Microbiology.)