Abstract
A GC–MS method, with direct aqueous injection, has been developed to determine alachlor and its degradation products in water. The method was optimized to give the following conditions: injection with splitless mode, injection port with silanized-glass reverse-cup liner filled with 0.5 cm Carbofrit above the cup; injection temperature of 250°C; and an analytical column with a stationary phase of 5% diphenyl and 95% dimethyl polysiloxane and dimensions of 60 m×0.25 mm×0.25 μm. The minimum detection limit is 0.05 to 1 mg/l in the GC–MS-SIM mode with variation of peak height less than 5% and 5 to 50 mg/l in the GC–MS-Scan mode for alachlor and its degradation products.
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