Determination of aryloxyphenoxypropanoic acid derivatives in crops treated with herbicidal sprays.
A reproducible and sensitive gas chromatographic method has been developed for the trace analysis of fluazifop-butyl, haloxyfop-ethoxyethyl and quizalofop-ethyl as well as their main metabolites (corresponding acids analysed after conversion to methyl esters) in some fruits and vegetables treated with herbicidal sprays. Comparable detection limits (0.01 mg/kg) were achieved when mass fragmentography and/or the electron capture detector were employed. However, in the latter case, bromination of fluazifop esters had to be carried out prior to GC analysis. By means of the nitrogen-phosphorus detector, determination of residues at a level of 0.05 mg/kg was possible. The residue values found in strawberries, cabbages, cauliflower and carrots were used to discuss the degree of metabolic hydrolysis of parent esters, i.e. active ingredients of herbicides.
Jehlicková
Z
Z
Department of Food Chemistry and Analysis, Institute of Chemical Technology, Prague, Czechoslovakia.
Hajslová
J
J
Poustka
J
J
Pudil
F
F
Davidek
J
J
D002849:Chromatography, Gas; D005638:Fruit / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D006540:Herbicides / Q000032:analysis*; D006868:Hydrolysis; D010573:Pesticide Residues / Q000032:analysis*; D011422:Propionates / Q000032:analysis*; D011725:Pyridines / Q000032:analysis; D011810:Quinoxalines / Q000032:analysis; D014675:Vegetables / Q000032:analysis*
D006540:Herbicides; D010573:Pesticide Residues; D011422:Propionates; D011725:Pyridines; D011810:Quinoxalines; C050585:fluazifop-butyl; C054176:haloxyfop; C064835:quizalofop-ethyl