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Main Title Determination of Malathion, Malaoxon, and Mono- and Dicarboxylic Acids of Malathion in Fish, Oyster, and Shrimp Tissue.
Author Cook, Gary H. ; Moore., James C. ;
CORP Author Environmental Research Lab., Gulf Breeze, Fla.
Year Published 1976
Report Number EPA/600/J-76/072 ;Contrib-273;
Stock Number PB-268 574
Additional Subjects Malathion ; Insecticides ; Gas chromatography ; Fishes ; Shellfish ; Sea water ; Tissue extracts ; Concentration(Composition) ; Water analysis ; Chemical analysis ; Experiments ; Residues ; Carboxylic acids ; Monitoring ; Reprints ; Water pollution detection ; Water pollution effects(Animals)
Library Call Number Additional Info Location Last
NTIS  PB-268 574 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 5p
A method is described for monitoring the presence of malathion and its metabolites in the aquatic environment. Malathion, malaoxon, malathion monoacid, and malathion diacid were determined in fish, oyster, and shrimp tissues by gas-liquid chromatography (GLC) using phenthoate and phenthoate acid as internal standards. GLC analyses were performed without cleanup, using a flame photometric detector operating in the phosphorus mode. Acid compounds were methylated with diazomethane. Pinfish exposed to 75 micrograms/l of malathion in flowing seawater for 24 h contained no residues of malathion or malaoxon, although the concentration of the malathion monoacid in the gut was 31.4 micrograms/g. The data illustrate that pinfish rapidly convert malathion to the mono- and dicarboxylic acids of malathion.