Abstract Organophosphate pesticides in cold pressed citrus oils can be determined rapidly by a method using gas chromatographic procedures and the flame photometric detector developed by Brody and Chaney. This study revealed that cold pressed citrus oils obtained from the 1965— 1966 citrus crops from Florida and California contained from 1.5 to 20 ppm thiophosphate pesticides. The analytical procedure required approximately 40 min per analysis and eliminated the need for extensive preparation of the sample prior to introduction into the gas chromatograph. The procedure is more specific and less time consuming than methods previously described