This study proposes a methodology of determination of cadmium and manganese in food
samples using an aqueous two-phase system without extracting agent with F AAS detection. In …

… of multivariate techniques used for the optimization of analytical … of experimental designs in
optimization of sampling systems, … In another paper performed by this group, aqueous slurries …

… been applied increasingly to optimize the extraction … optimization methods (Brum et al.
2011; Jalali-Heravi et al. 2009). Experimental design methods, with a multivariate optimization …

… Procedures for optimization of factors by multivariate … than one variable to be optimized
simultaneously (Dos Santos et al., … optimization method and PBDs has been applied to optimize …

… for parathion extraction and determination in aqueous samples. The method was based
on the … Plackett–Burman and Box–Behnken designs were used for optimizing the solid-phase …

… The optimized extraction conditions were obtained with an ATPS formed by L64 + Na 2 SO
… , this paper presents for the first a multivariate study of yttrium recovery a rare earth element …

… to iron determination in aqueous samples. The detection method is … The optimization of the
solid-phase extraction system was … : sample percolation rate (0.5–9 ml min −1 ), sample metal …

… For multivariate optimization, different aliquots of TTA, Triton X-114 and buffer solutions were
… The aqueous phase obtained after CPE was removed by inversion of the vial and the surfac…

… aqueous standards and via the addition of external analytes to the soybean oil sample using
the extraction procedure with the optimized … external calibration with aqueous standards. …

… in aqueous samples, because the risk of contamination during … samples following a multivariate
optimization strategy. A multifactor categorical design was selected to study and optimize …