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- W2473511307 abstract "Abstract Analytical methods for determination of the derivatives of the herbicide mecoprop, (±)-2-(4-chloro-2-methylphenoxy)propionic acid (MCPP), by capillary column gas chromatography with mass selective detection (GC-MSD) and electron capture detection (GC-ECD) were studied. A successful procedure was introduced for the ester preparation using H2SO4 as the catalyst and the alcohols 2,2,2-trichloroethanol (TCE) or 2,2,2-tri-fluoroethanol (TFE). The identification and elucidation of MCPP by GC-MSD following the esterifica-tion with diazomethane, BF3-methanol, H2SO4-methanol, TCE, TFE, or pentafluorobenzyl bromide (PFB) were carried out. A comparison of the response sensitivities among those MCPP esters was made with GC-ECD. Although the methyla-tion product of MCPP was confirmed with GC-MSD, its low sensitivity to the ECD limited the detection of MCPP. TCE, TFE, and PFB derivatiza-tion methods resulted in a high rate of MCPP esteri-fications and very sensitive ECD molecular responses. On the basis of efficiency, convenience, worker safety, and least sample contamination, TFE esterification was considered as the superior method for MCPP analysis compared with the other methods of derivatization. An accurate method is described for quantifying MCPP in soil leachates by GC-ECD at very low concentrations without the requirement of a complicated cleanup process. As a result, MCPP residues at concentrations of less than 0.1 μg in 100 mL soil leachate were detected." @default.
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- W2473511307 date "1994-09-01" @default.
- W2473511307 modified "2023-09-24" @default.
- W2473511307 title "Improved Esterification of Mecoprop for Sensitive Detection on Capillary Gas Chromatography with Mass Selective and Electron Capture Detection" @default.
- W2473511307 doi "https://doi.org/10.1093/jaoac/77.5.1077" @default.
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