Determination of diclofop-methyl and diclofop residues in soil and crops by gas chromatography.
A method is described for the determination of residues of the herbicide diclofop-methyl and its metabolite, diclofop, in soil and crops. The residues were extracted with acetone-light petroleum and extracts were concentrated (diclofop was derivatized to its pentafluorobenzyl derivative), and then the products were purified on a chromatographic column containing alumina, silver-alumina and Florisil. Finally, they were determined by gas chromatography using an electron-capture detector. The detection limits of diclofop-methyl and diclofop were between 0.01 and 0.05 mg/kg. The average recoveries were 76.4-97.2% and 72.8-105.2%, respectively, making the method suitable for statutory residue testing purposes.
Liu
W P
WP
Department of Chemistry, Zhejiang University, Hangzhou, China.
Chen
Z W
ZW
Xu
H Q
HQ
Shi
Y Y
YY
Chen
Y Z
YZ
D000383:Agriculture; D002681:China; D002849:Chromatography, Gas / Q000295:instrumentation / Q000379:methods*; D055768:Halogenated Diphenyl Ethers; D006540:Herbicides / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D010647:Phenyl Ethers / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014908:Triticum / Q000032:analysis; D014675:Vegetables / Q000032:analysis
D055768:Halogenated Diphenyl Ethers; D006540:Herbicides; D010573:Pesticide Residues; D010647:Phenyl Ethers; D012989:Soil Pollutants; C012891:dichlorfop-methyl