Record Display for the EPA National Library Catalog


Main Title Microbial-malathion interaction in artificial salt-marsh ecosystems : effect and degradation /
Author Bourquin, A. W.
CORP Author Environmental Protection Agency, Gulf Breeze, Fla. Gulf Breeze Environmental Research Lab.;National Environmental Research Center, Corvallis, Oreg.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, National Environmental Research Center,
Year Published 1975
Report Number EPA-660/3-75-035
Stock Number PB-246 251
OCLC Number 01865411
Subjects Malathion--Biodegradation ; Salt marsh ecology
Additional Subjects Aquatic microbiology ; Ecology ; Malathion ; Swamps ; Degradation ; Pesticides ; Bacteria ; Salt water ; Carboxylic acids ; Esterases ; Salinity ; Temperature ; Salt marshes ; Ecosystems
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 660-3-75-035 Headquarters Library/Washington,DC 12/14/2013
EJDD  EPA-660/3-75-035 Env Science Center Library/Ft Meade,MD 03/14/1997
EKBD  EPA-660/3-75-035 Research Triangle Park Library/RTP, NC 03/29/1996
EKCD  EPA-660/3-75-035 CEMM/GEMMD Library/Gulf Breeze,FL 02/08/2008
ELBD ARCHIVE EPA 660-3-75-035 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ELBD RPS EPA 660-3-75-035 repository copy AWBERC Library/Cincinnati,OH 10/17/2014
NTIS  PB-246 251 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation vi, 41 pages : illustrations, figures, tables ; 28 cm
Malathion is rapidly degraded in vitro by salt-marsh bacteria to malathion-monocarboxylic acid, malathion-dicarboxylic acid and various phosphothionates as a result of carboxyesterase cleavage. In addition, some expected phosphatase activity produces desmethyl-malathion, phosphotionates, 4-carbon dicarboxylic acids, and corresponding ethyl esters. In a simulated salt-marsh environment, malathion is degraded by the indigenous bacterial community. Numbers of bacterial capable of degrading malathion in the presence of additional nutrients increase in the sediments with increasing frequency of application and in the water column with the increasing level of treatment. Numbers of bacteria which degrade malathion as a sole carbon source are linked to the level of treatment in sediments and the frequency of treatment in the water column; however, these bacteria do not appear to play a significant role in the dissipation of malathion. The disappearance of malathion in the salt-marsh environment is influenced by both chemical and biological degradation; however, at temperatures below 26C and salinities below 20 parts per thousand by weight, chemical mechanisms appear to be of less importance than biological degradation.
"June 1975." U.S. Environmental Agency Program No. Contract Number: Element Number 1EA077; ROAP Number 10AKC, Task Number 006. Includes bibliographical references (pages 38-40).