|MAREK, LE ETTA|
Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/26/1997
Publication Date: N/A
Technical Abstract: Supercritical fluid extraction (SFE) is increasingly being used to extract pesticides from soils. While SFE has numerous potential advantages over solvent extraction techniques, it does not appear that it will be the universal technique originally hoped for, particularly in the case of the newer classes of pesticides and aged soil residues. For instance, a general technique could not be developed for sulfonylurea herbicides; metsulfuron methyl and sulfometuron methyl could be quantitatively extracted, however nicosulfuron could not be extracted. The insecticide imidacloprid also could not be extracted from soil. Extraction of aged atrazine and alachlor in soil was not as efficient as organic solvent extraction and SFE efficiency decreased with aging time. It appears that there will be no shortcuts in the development of SFE methods for the extraction of pesticides from soil. Each new pesticide-soil combination will require method optimization.