Dispersive micro-solid phase extraction of ortho-phosphate ions onto magnetite nanoparticles and determination as its molybdenum blue complex (Journal article)

Giannoulis, K. M./ Tsogas, G. Z./ Giokas, D. L./ Vlessidis, A. G.


A direct microextraction method, employing dispersive micro-solid phase extraction (mu-SPE) of orthophosphate (o-PO43-) anions onto ferromagnetic nanoparticles (MNPs) is described in this work for the first time. The method exploits the complexation of phosphate ions on the surface of positively charged magnetite nanoparticles through the formation of an inner sphere complex, which are separated from the bulk aqueous phase with the application of an adscititious magnetic field. Phosphates are eluted with sodium bicarbonate and determined spectrophotometrically as their phosphomolybdenum blue complex. The method is generally free from common interferences, likely to affect the measurement of phosphate, since it alleviates their presence already from the extraction step, thus they are absent during detection. The detection limits are as low as 0.01 mu M with very satisfactory precision ranging from 3.68% (intra-day) to 8.5% (inter-day) and accuracy between 91.5% and 104.8%. (C) 2012 Elsevier B.V. All rights reserved.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: magnetic iron oxide nanoparticles,dispersive micro-solid phase extraction,orthophosphate,molybdenum blue,uv-vis,natural waters,iron-oxide nanoparticles,waste-water,spectrophotometric determination,gamma-fe2o3 nanoparticles,maghemite nanoparticles,injection-analysis,aqueous-solutions,natural-waters,adsorption,silicate
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/10436
ISSN: 0039-9140
Link: <Go to ISI>://000309785300009
http://ac.els-cdn.com/S0039914012003980/1-s2.0-S0039914012003980-main.pdf?_tid=2c917f4c-356b-11e3-88cd-00000aacb35f&acdnat=1381822197_32e3f54d4d5c23b73ee3a299b88235f7
Publisher: Elsevier
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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