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5224708 
Journal Article 
Comparison of supercritical fluid extraction with classical sonication and soxhlet extractions for selected pesticides 
Snyder, JL; Grob, RL; Mcnally, ME; Oostdyk, TS 
1992 
Yes 
Analytical Chemistry
ISSN: 0003-2700
EISSN: 1520-6882 
64 
17 
1940-1946 
English 
WOS:A1992JK79600033 
BIOSIS COPYRIGHT: BIOL ABS. The supercritical fluid extraction of organophosphate and organochlorine pesticides from soils was investigated and compared to the classical sonication and soxhlet extractions. Four soils, sand, clay, top soil, and river sediment, were spiked with 12 organochlorine and organophosphate pesticides. These soils were extracted with supercritical CO2 modified with 3% MeOH at a pressure of 350 atm and a temperature of 50?C. Overall average recoveries of the 12 pesticides were greater than 85% for each of the soil matrices, and the overall average relative standard deviation (RSD) for all the pesticides and soils was 5.1%. Secondly, a large batch of top soil was specially prepared and fortified with the same pesticides and repetively extracted using SFE (n = 9) and the classical sonication (n = 9) and soxhlet (n = 8) extractions. The recovery data and precision of each extraction method was evaluated statistically. It was found that overall average recoveries of the 12 pestici