| Main Title |
Rates of Transformation of Methyl Parathion and Diethyl Phthalate by Aufwuchs Microorganisms. |
| Author |
Lewis, David L. ;
Holm, Harvey W. ;
|
| CORP Author |
Environmental Research Lab., Athens, GA. |
| Year Published |
1981 |
| Report Number |
EPA-600/J-81-492; |
| Stock Number |
PB82-158155 |
| Additional Subjects |
Toxicology ;
Insecticides ;
Plasticizers ;
Cultures(Biology) ;
Concentration(Composition) ;
Microorganisms ;
Transformations ;
Phosphorus organic compounds ;
Reprints ;
Methyl parathion ;
Aufwuchs ;
Phosphorothioic acid/(dimethyl-ester)-(nitrophenyl-ester)
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB82-158155 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
8p |
| Abstract |
Using batch cultures, the authors determined transformation rates for low concentrations of two toxicants--an insectide, methyl parathion, and a plasticizer, diethyl phthalate--by aufwuchs. Aufwuchs samples were collected from field sites, an indoor channel, and a continuous-flow fermentor. Aufwuchs fungi, protozoa, and algae did not tranform the chemicals but bacteria rapidly transformed both. Second-order transformation rate coefficients, Kb, based on total plate counts of bacteria in aufwuchs, were determined for potential use in a mathematical model capable of predicting the transport and fate of chemicals in aquatic systems. Kb for both chemicals decreased as the concentration of total bacteria, (B), increased in aufwuchs. This effect resulted from the proportion of nontransformer to transformer bacteria increasing as (B) increased and from the rate of transformation per transformer cell decreasing as (B) increased. First-order transformation rate coefficients, K1, were relatively stable per unit of surface area colonized by aufwuchs because Kb decreased as (B) increased (K1 = Kb X (B)). |
| Supplementary Notes |
Pub. in Applied and Environmental Microbiology, v42 n4 p698-703 Oct 81. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Rates of Transformation of Methyl Parathion and Diethyl Phthalate by Aufwuchs Microorganisms. |
| PUB Date Free Form |
1981 |
| Category Codes |
6T; 6M; 57Y; 57K |
| NTIS Prices |
PC A02/MF A01 |
| Primary Description |
600/01 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
323811014 |
| Origin |
NTIS |
| Type |
CAT |
