Determination of Fenthion Residues in Samples of Marine Biota and Seawater from Laboratory Exposures and Field Applications

摘要

A method for measuring fenthion in samples from the estuarine environment is described. The method was applied to samples from field applications of fenthion to control saltmarsh mosquitos. The method, offers an improvement in the silica gel cleanup of Watts (11), and yields greater than 85% recovery of fenthion from water, plant, fish and shrimp tissues. Gas-liquid chromatography with thermionic detection was used to quantify fenthion residues as low as 0.010 micrograms/L in seawater and 0.010 micrograms in biota.