Abstract
The determination of phenoxy ester herbicides was carried out by high-performance liquid (HPLC) and gas chromatography (GC) and their identification by GC—MS spectrometry. Standards of herbicide esters were obtained from the appropriate acid and a suitable alcohol, mainly 2-butoxyethyl, isooctyl or isobutyl alcohol, using acetyl chloride as a catalyst. The mixture was heated at 100°C for 1 h, after cooling 2 ml of acetate buffer (pH 4.6) were added and then the mixture was diluted to volume with methanol. Good ester conversion (>95%) was achieved. The phenoxy esters were analysed by reversed-phase HPLC on a Spherisorb ODS-2 (5-μm) column with acetonitrile—water (85:15) as mobile phase at a flow-rate of 1 ml/min and UV detection at 280 nm. GC was performed on a BP-5 capillary column with helium as carrier gas (10 ml/min) and flame ionization detection. Esters were identified by GC—ion trap detection on a BP-1 capillary column. Several mixtures of phenoxy ester herbicides in formulations were analysed using the proposed methods and good agreement between the HPLC and GC results was obtained.
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