Nonaqueous catalytic fluorometric trace determination of vanadium based on the pyronine B-hydrogen peroxide reaction and flow injection after cloud point extraction (Journal article)

Paleologos, E. K./ Koupparis, M. A./ Karayannis, M. I./ Veltsistas, P. G.

The catalytic effect of vanadium on the pyronine B-H2O2 system is examined. Enhancement of the catalytic reaction rate along with the efficiency and selectivity against vanadium is achieved in a formic acid environment in the presence of a nonionic surfactant (Triton X-114). Elimination of drastic interference caused by inorganic acids and aqueous matrix along with a 50-fold preconcentration of vanadium are facilitated through cloud point extraction of its neutral complex with 8-quinolinol in an acidic solution. Subsequent flow injection analysis (FIA) with fluorometric detection renders the proposed method ideal for selective and cost-effective determination of as little as 0.020 mug L-1 vanadium in environmental, biological, and food substrates. The preconcentration step can be applied simultaneously to multiple samples, allowing for massive preparation prior to analysis, compensating, thus, for the time-consuming procedure.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: sensitive spectrophotometric determination,atomic-absorption spectrometry,electron-spin-resonance,thermometric determination,kinetic determination,gallic acid,oxidation,samples,bromate,speciation
ISSN: 0003-2700
Link: <Go to ISI>://000171044600006
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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