title: Ionic liquid mediated extraction, assisted by ultrasound energy, of available/mobilizable metals from sediment samples.
abstract: A new extraction method for metals from sediment samples was developed. In this procedure, the chelating agent EDTA was combined with a minimal amount of the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate (Bmim[BF4]), assisted by ultrasound energy. The available analytes -Cd, Cr, Cu, Ni, Pb and Zn- were extracted under optimal conditions for a 12.5 ratio (extractant volume/sample mass) with 0.005molL-1EDTA solution, 0.1molL-1NaHCO3, 5.0mmolL-1Bmim[BF4] and 7.0min of sonication time, using an ultrasonic bath (output power of 160W). The best extractions were obtained with 100W (power dissipated in the liquid). These conditions were obtained applying the univariate method. It is important to highlight that the conventional method (extraction with 0.05molL-1EDTA solution only) consumes 6h to extract available metals from sediment samples selectively, and with the proposed procedure the extraction time is noticeable reduced to 7.0min. Extractable metal concentrations obtained were measured by flame atomic absorption spectrometry. The results showed good agreement with those obtained by the conventional method using a Student's paired t-test.
authors: Departamento de Química, Universidad Nacional del Sur, Instituto de Química del Sur, INQUISUR (UNS-CONICET), Sección Química Analítica, Av. Alem 1253, (B8000CPB) Bahía Blanca, Argentina.
authors: Silvana M
authors: SM
authors: Álvarez
authors: Departamento de Química, Universidad Nacional del Sur, Instituto de Química del Sur, INQUISUR (UNS-CONICET), Sección Química Analítica, Av. Alem 1253, (B8000CPB) Bahía Blanca, Argentina.
authors: Natalia E
authors: NE
authors: Llamas
authors: Departamento de Química, Universidad Nacional del Sur, Instituto de Química del Sur, INQUISUR (UNS-CONICET), Sección Química Analítica, Av. Alem 1253, (B8000CPB) Bahía Blanca, Argentina.
authors: Adriana G
authors: AG
authors: Lista
authors: Departamento de Química, Universidad Nacional del Sur, Instituto de Química del Sur, INQUISUR (UNS-CONICET), Sección Química Analítica, Av. Alem 1253, (B8000CPB) Bahía Blanca, Argentina. Electronic address: malvarez@criba.edu.ar.
authors: Mónica B
authors: MB
authors: Álvarez
authors: Departamento de Química, Universidad Nacional del Sur, Instituto de Química del Sur, INQUISUR (UNS-CONICET), Sección Química Analítica, Av. Alem 1253, (B8000CPB) Bahía Blanca, Argentina. Electronic address: cdomini@criba.edu.ar.
authors: Claudia E
authors: CE
authors: Domini
keywords: Extraction; Ionic liquid; Metals; Sediments; Ultrasonic energy