title: Continuous approach for ultrasound-assisted acid extraction-minicolumn preconcentration of chromium and cobalt from seafood samples prior to flame atomic absorption spectrometry.
abstract: A rapid and sensitive method has been proposed for the determination of chromium and cobalt in seafood samples by flame atomic absorption spectrometry combined with a dynamic ultrasound-assisted acid extraction and an on-line minicolumn preconcentration. The use of diluted nitric acid as extractant in a continuous mode at a flow rate of 3.5 mL min(-1) and room temperature was sufficient for quantitative extraction of these trace metals from seafoods. A minicolumn containing a chelating resin was an excellent device for the quantitative preconcentration of chromium and cobalt prior to their detection. A flow-injection manifold was used as interface for coupling all analytical steps, which allowed the automation of the whole analytical process. A Plackett-Burman experimental design was used as a multivariate strategy for the optimization of both sample preparation and preconcentration steps. The method was successfully applied to the determination of chromium and cobalt in seafood samples.
authors: Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Chemistry, University of Santiago de Compostela, Santiago de Compostela, Spain. qncayebi@usc.es
authors: Maria C
authors: MC
authors: Yebra-Biurrun
authors: Sheila
authors: S
authors: Cancela-Pérez
mesh_terms: D002138:Calibration; D002857:Chromium / Q000032:analysis*; D003035:Cobalt / Q000032:analysis*; D005504:Food Analysis / Q000295:instrumentation / Q000379:methods; D005506:Food Contamination / Q000032:analysis*; D017747:Seafood / Q000032:analysis / Q000592:standards; D012680:Sensitivity and Specificity; D013054:Spectrophotometry, Atomic; D014465:Ultrasonics
chemical_list: D002857:Chromium; D003035:Cobalt