Abstract
A continuous-flow extraction system coupled on-line with a high-performance liquid chromatograph with an ultraviolet detector is used to study the extraction of three organophosphorus pesticides (fenthion, azinphos methyl and diazinon) from aqueous samples with n-heptane as the organic solvent. Diazinon was not extracted significantly. The influence on the extraction of different parameters (coil length, flow rate and phase volume ratio) were studied. The calibration graphs are linear for 0.5–7 mg l −1 and 8–20 mg l −1 foor azinphos methyl where the percentage extraction ( E%) is 90% and 70%, respectively, and up to 4 mg l −1 for fenthion, where the E% is 33%. The detection limits and the relative standard deviations are 0.04 and 0.09 mg l −1, and 3.4 and 5.3%, for azinphos methyl fenthion, respectively. Other pesticides and related compounds were found not to interfere. The sample throughput of this method was 15 h −1.
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