Gas chromatographic determination of triclopyr in fruits and vegetables.
This research was comprised of two parts: quantitative analyses, and confirmatory test. In the quantitative analyses, five classes of fruits and vegetables comprising 10 individual commodities were fortified with triclopyr herbicide at 0.4 and 0.8 ppm level. Triclopyr was extracted from the matrices and derivatized separately to 2-chloroethylene ester with 2-chloroethanol-BCl3 and methyl ester with diazomethane. The esters were then quantitated by GC-ECD and GC-NPD. The GC-ECD recoveries for 2-chloroethylene ester were 100.0% and 100.7% at 0.4 ppm and 0.8 ppm fortification levels, respectively, whereas methyl ester recovery was 103.9% at 0.4 ppm fortification level. Similarly, the GC-NPD recoveries for 2-chloroethylene ester were 99.0% and 97.9% at 0.4 ppm and 0.8 ppm fortification levels respectively, whereas methyl ester recovery was 102.0% at 0.4 ppm fortification level. In the confirmatory test, the 2-chloroethylene ester was introduced into a GC-ion trap. The EI mass spectrum was then interpreted based on the criteria of molecular ion, isotopes, base ion, characteristic ions and the nitrogen rule. Compared to existing methods, this method has reduced partition solvents to nearly one-tenth. In addition, this method proved to be simple, fast, safe and accurate.
Ting
K C
KC
State of California, Department of Food and Agriculture, Anaheim 92801.
Lee
C S
CS
D002849:Chromatography, Gas / Q000379:methods*; D005638:Fruit / Q000737:chemistry*; D006016:Glycolates / Q000032:analysis*; D006540:Herbicides / Q000032:analysis*; D013058:Mass Spectrometry; D014675:Vegetables / Q000737:chemistry*
D006016:Glycolates; D006540:Herbicides; C032742:triclopyr