Journal
MICROCHIMICA ACTA
Volume 181, Issue 15-16, Pages 1807-1814Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-014-1239-0
Keywords
Polycyclic aromatic hydrocarbons; Heteropoly acid; Tungstophosphoric acid; Solid-phase microextraction; Gas chromatography-mass spectrometry
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A highly porous silica-supported tungstophosphoric acid (PW) nanocluster was prepared for use in solid-phase microextraction (SPME) of polycyclic aromatic hydrocarbons (PAHs). The PWs represent a class of discrete transition metal-oxide nanoclusters and their structures resemble discrete fragments of metal-oxide structures of definite size and shape. Transition metal-oxide nanoclusters display large structural diversity, and their monodisperse sizes can be tuned from several ngstroms up to 10 nm. The highly porous silica-supported tungstophosphoric acid nanocluster material is found to be capable of efficiently extracting PAHs from aqueous sample solutions. The nanomaterial was immobilized on a stainless steel wire for fabrication of the SPME fiber. Following thermal desorption, the PAHs were quantified by GC-MS. Analytical merits include limits of detection that range from 0.02 to 0.1 pg mL(-1) and a dynamic range as wide as from 0.001 to 100 ng mL(-1). Under optimum conditions, the repeatability for one fiber (n = 3), expressed as the relative standard deviation, is between 4.3 % and 8.6 %. The method is simple, rapid, and inexpensive. The thermal stability of the fiber and the high relative recovery make this method superior to conventional methods of extraction.
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