Abstract
The electrochemical detection of analytes subjected to cloud point preconcentration opens new perspectives to this methodology, whose major limitation lies in the high absorbance background due to the surfactant. In the present work, dual electrochemical detection (reductive-oxidative mode) was used for the liquid chromatographic analysis of organophosphorus pesticides after cloud point preconcentration with the nonionic surfactant Triton X-114. Preconcentration of as little as 15 mL of sample with a Triton X-114 concentration of 1.0% permits the detection of amounts lower than 0.4 ppb.
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