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Magnetic solid phase extraction (MSPE) with cobalt ferrite nanoparticles coated with oleic acid is described for the determination of alkylphenols (APs), 4-tert-butylphenol (TBP), 4-pentylphenol (PP), 4-hexylphenol (HP), 4-tert-octylphenol (TOP), 4-n-octylphenol (OP) and 4-nonylphenol (NP) in baby foods using gas chromatography with mass spectrometry (GC–MS). Prior to MSPE, the sample was treated...
The combination of liquid chromatography with hydride generation atomic fluorescence spectrometry was used as a technique for the speciation of selenite, selenate, selenocystine and selenomethionine. Two chromatographic techniques were used by connecting reversed-phase C 18 and ion-exchange columns in series, the mobile phase being a gradient from water to phosphate buffer. Se-compounds were...
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