Hm. Pylypiw et al., SUITABILITY OF MICROWAVE-ASSISTED EXTRACTION FOR MULTIRESIDUE PESTICIDE ANALYSIS OF PRODUCE, Journal of agricultural and food chemistry, 45(9), 1997, pp. 3522-3528
A systematic study of the microwave-assisted extraction of field-incur
red pesticide residues from several crop matrices was conducted. Five
crops consisting of beets, cucumbers, lettuce, peppers, and tomatoes w
ere grown and treated in the field with seven pesticides, dacthal, chl
orpyrifos, chlorothalonil, diazinon, permethrin, methoxychlor, and azi
nphos-methyl. Values were determined for the microwave extraction para
meters, time and temperature, which resulted in efficient recovery ove
r the selected pesticides and crops. The microwave settings were shown
to be dependent on both crop matrix and pesticide. Recovery of the fu
ngicide chlorothalonil was highly dependent on temperature, while the
remaining pesticides tested were not so demanding. Using the selected
microwave time and temperature values, pesticide recoveries from the m
icrowave method were then compared with those of the conventional meth
od. Statistical comparison of pesticide recoveries and method reproduc
ibility of the microwave method versus the conventional blender extrac
tion indicated that microwave extraction data compare favorably with c
onventional extraction data.