Journal
MICROCHIMICA ACTA
Volume 172, Issue 3-4, Pages 465-470Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-010-0451-9
Keywords
Organophosphorus pesticides; Dispersive liquid-liquid microextraction; Central composite design; High-performance liquid chromatography
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A method was developed for analyzing the organophosphorus pesticides Fenitrothion, Diazinon and Ethion in water samples via dispersive liquid-liquid microextraction and high-performance liquid chromatography. Chloroform and methanol were selected as extraction and dispersive solvents, respectively. Extraction and dispersive solvents (and their volumes), the pH of the sample, and salting out effect were optimized to give a calibration plot that is linear in the range from 10 to 4000 ng.mL(-1) Detection limits are 2 ng.mL(-1) for Fenitrothion and 3 ng.mL(-1) for Diazinon and Ethion. The relative standard deviations for six replicate measurements of 500 ng.mL(-1) of the three pesticides are 3.3, 2.2 and 4.1%, respectively.
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