Response surface methodology for the microwave-assisted extraction of insecticides from soil samples
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Abstract
The extraction of two pyrethroid insecticides (deltamethrin and α-cypermethrin) together with three organophosphorus insecticides (dimethoate, diazinon and malathion) from soil samples was carried out with microwave-assisted technology. Experimental designs showed that extraction temperature, addition of water to the extractant and solvent/soil ratio were the variables that affected the recoveries of the pesticide the most. Response surface methodology was applied to find the optimum values of the variables involved in the extractions of the analytes. In addition, in order to achieve near-optimal extraction conditions, a desirability function was used to optimize the five pesticides simultaneously. The optimized conditions were applied to different types of soils.
Keywords
Microwave-assisted extraction Soil samples Pyrethroid pesticides Organophosphorous pesticides Box–Behnken design Desirability functionAbbreviations
- BBD
Box–Behnken design
- CEC
cation exchange capacity
- D
desirability function
- di
partial desirability function
- MAE
microwave-assisted extraction
- OC
organic carbon
- P
probability level
- PTFE
polytetrafluoroethylene
- Q2
prediction coefficient
- R2
determination coefficient
- RP
ramp time
- RSD
relative standard deviation
- RSM
response surface methodology
- S/S
solvent/soil ratio
- Si
soil sample
- TM
hold time
- TP
temperature
- W
additional water
Notes
Acknowledgements
MCHS is grateful for the grant received from the Avenzoar Foundation. R. Phan-Tan-Luu is acknowledged for kindly providing the statistical package, Nemrod W. This work was partially financed by a national project from CICYT (ref. CGL2006-0544/HID).
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