Cloud point-dispersive mu-solid phase extraction of hydrophobic organic compounds onto highly hydrophobic core-shell Fe2O3@C magnetic nanoparticles
Φόρτωση...
Ημερομηνία
Συγγραφείς
Giokas, D. L.
Zhu, Q.
Pan, Q. M.
Chisvert, A.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of Chromatography A
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
A novel two-step extraction technique combining cloud point extraction (CPE) with dispersive micro-solid phase extraction (D-mu-SPE) is presented in this work for the first time. The method involves initial extraction of the target analytes by CPE in the micelles of a non-ionic surfactant medium; then highly hydrophobic polysiloxane-coated core-shell Fe2O3@C magnetic nanoparticles (MNPs) are used to retrieve the micellar phase. In that manner, the micellar phase containing the analytes is the target of the D-mu-SPE step rather than the analytes directly. MNPs are then collected by the application of an adscititious magnetic field overcoming the need for specific steps associated with CPE such as centrifugation to separate the surfactant-rich phase, refrigeration of the condensed micellar phase to reduce its viscosity or appropriate apparatus that enable direct sampling of the surfactant-rich phase. A noteworthy feature of the method is the introduction of highly oleophilic MNPs, which afford rapid and quantitative mass transfer of the surfactant phase, as opposed to other more conventional hydrophobic nanoparticles. In that manner, fast and reproducible extraction is accomplished, lending improved analytical features compared to conventional CPE, such as reduced analysis time and relative inertness to surfactant concentration and equilibration temperature. The analytes were recovered from the surface of MNPs by ultrasound-assisted back-extraction in a water-immiscible organic solvent where analytes are readily partitioned but the surfactant has limited solubility, thus minimizing its interference during chromatographic detection. As an analytical demonstration, different UV absorbing chemicals with various physico-chemical properties were used as model organic compounds for optimizing the parameters associated with this novel two-step extraction approach. The proposed method, combining two different and efficient techniques, offers satisfactory analytical features in terms of repeatability (4.5-7.5%), reproducibility (7.0-14.9%) and accuracy (88.5-97.2%). Most importantly it poses as an alternative and fast method for sample pretreatment opening new insights in surfactant-mediated extractions. (c) 2012 Elsevier B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
cloud point extraction, dispersive micro-solid phase extraction, highly hydrophobic magnetic nanoparticles, ultrasound-assisted back-extraction, uv filters, chromatography-mass-spectrometry, liquid-liquid microextraction, micelle-mediated extraction, gas-chromatography, water samples, solvent-extraction, back-extraction, uv filters, preconcentration, residues
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000307428800005
http://ac.els-cdn.com/S002196731200948X/1-s2.0-S002196731200948X-main.pdf?_tid=708e3c04-349d-11e3-8c41-00000aab0f27&acdnat=1381733835_34b79487494883b712147dc1fc49f7e8
http://ac.els-cdn.com/S002196731200948X/1-s2.0-S002196731200948X-main.pdf?_tid=708e3c04-349d-11e3-8c41-00000aab0f27&acdnat=1381733835_34b79487494883b712147dc1fc49f7e8
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας