| Main Title |
Seasonal Effects on Microbial Transformation Rates of an Herbicide in a Freshwater Stream: Application of Laboratory Data to a Field Site. |
| Author |
Lewis, D. L. ;
Freeman, L. F. ;
Watwood, M. E. ;
|
| CORP Author |
Environmental Research Lab., Athens, GA. ;Georgia Univ., Athens. |
| Year Published |
1986 |
| Report Number |
EPA/600/J-86/235; |
| Stock Number |
PB87-168100 |
| Additional Subjects |
Herbicides ;
Stream pollution ;
Field tests ;
Aquatic microbiology ;
Water chemistry ;
Reprints ;
Microbial degradation ;
Temperature effects ;
Biodegradation ;
Toxic substances ;
Acetic acid/(butoxyethyl-ester)-dichlorophenoxy
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB87-168100 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
8p |
| Abstract |
Seasonal effects on microbial transformation rates of an herbicide, 2,4-dichlorophenoxyacetic acid butoxyethyl ester (2,4-DBE), in a freshwater stream were investigated using low concentrations (less than 100 micrograms L(-1)) of the herbicide mixed with an inert dye, rhodamine WT, to correct for dilution. Although water temperatures decreased from 22 + or - 0.5 to 8.0 + or - 0.5 degrees C and water velocities decreased from 0.09 + or - 0.01 to 0.03 + or - 0.003 m s(-1), microbial transformation rates, as indicated by pseudo-first-order transformation rate coefficients, increased as much as threefold in the cold months over those in the spring and summer. The increased winter transformation rates were associated with leaf-litter accumulation, which provided additional colonized surface area in the stream. Therefore, the increased colonized surface area more than compensated for the effects of temperature and water velocity (under conditions of mass-transport limitation) that otherwise would have reduced microbial transformation rates in the winter months. (Copyright (c) 1986, Environmental Toxicology and Chemistry.) |
| Supplementary Notes |
Pub. in Environmental Toxicology and Chemistry, v5n9 p791-796, 1986. Prepared in cooperation with Georgia Univ., Athens. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Seasonal Effects on Microbial Transformation Rates of an Herbicide in a Freshwater Stream: Application of Laboratory Data to a Field Site. |
| PUB Date Free Form |
c1986 |
| Category Codes |
68E; 57K; 48G |
| NTIS Prices |
PC A02/MF A01 |
| Primary Description |
600/01 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
715626980 |
| Origin |
NTIS |
| Type |
CAT |
