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Application of Focused Ultrasound-Assisted Extraction to the Determination of Persistent Organic Pollutants (POPs) in
R Flores-Ramírez1, S E Medellín-Garibay, C G Castillo
1Centro Nacional de Bioanálisis (CENBIOS)-Centro de Investigación Aplicada en Ambiente y Salud, CIACYT, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona 550, 78210, San Luis Potosí, S.L.P., Mexico.
Abstract:
A simple and rapid focused ultrasound extraction (FU) based method is presented for the determination of persistent organic pollutants (POPs) in soil using a gas chromatography coupled to a mass detector with electron impact ionization. The main experimental parameters affecting the FU step have been optimized by applying a PERMANOVA and PCO analysis allowing us to obtain a maximum amount of information with a minimum number of assays. The limits of detection for POPs fell within the 0.9-6.8 ng/g d.w. interval; a linear method was used with correlation coefficients (r) higher than 0.99. Recovery percentages at low concentrations (25 ng/g d.w.) were 75.8%-110%, and at high concentrations (75 ng/g d.w.) 82.3%-109%; the evaluated precision as RSD% of repeatability and reproducibility were within a range of 0.5%-11% and 0.3%-18%, respectively.
