Record Display for the EPA National Library CatalogRECORD NUMBER: 5 OF 12
|Main Title||Determination of the Insect Growth Regulator Methoprene in Natural Waters by Capillary Gas-Liquid Chromatography.|
|Author||Knuth, M. L. ;|
|CORP Author||Environmental Research Lab.-Duluth, MN.|
|Additional Subjects||Insects ; Pesticides ; Growth regulators ; Determination ; Residues ; Gas chromatography ; Pest control ; Shallow water ; Watersheds ; Statistical analysis ; Reprints ; Methroprene ; Aquatic ecosystems ; Flame ionization|
Residues of methoprene were measured in natural waters by capillary gas-liquid chromatography (GLC). Methoprene was extracted in the field by liquid-liquid partitioning with dichloromethane, transported to the laboratory, and extracted a second time with hexane. The extracts were dried with Na2SO4 and analyzed by Capillary GLC on a 15m x 0.25 mm, DB-5 capillary column using a hydrogen flame ionization detector. The recovery of methoprene from natural waters was 107.6 plus or minus 20.2% (n=18). Methoprene was detected in 3 of 5 sites sampled and ranged from 0.39 to 8.8 micro g/L.