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Cadmium Assisted Photochemical Vapor Generation of Tungsten for Detection by Inductively Coupled Plasma Mass Spectrometry

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    0509645 - ÚIACH 2020 RIV US eng J - Článek v odborném periodiku
    Vyhnanovský, Jaromír - Sturgeon, R. E. - Musil, Stanislav
    Cadmium Assisted Photochemical Vapor Generation of Tungsten for Detection by Inductively Coupled Plasma Mass Spectrometry.
    Analytical Chemistry. Roč. 91, č. 20 (2019), s. 13306-13312. ISSN 0003-2700. E-ISSN 1520-6882
    Grant CEP: GA ČR(CZ) GJ19-17604Y
    Institucionální podpora: RVO:68081715
    Klíčová slova: photochemical vapor generation * ICPMS * tungsten
    Obor OECD: Analytical chemistry
    Impakt faktor: 6.785, rok: 2019
    Způsob publikování: Omezený přístup

    Efficient photochemical vapor generation (PVG) of tungsten has been achieved for the first time using a 19 W thin film flow-through photoreactor. The volatile
    product (most probably tungsten hexacarbonyl) was generated using a flow injection mode and 40% (v/v) formic acid as the reaction medium. An inductively coupled plasma mass
    spectrometer was utilized for ultrasensitive detection. The addition of Cd2+ as a sensitizer was critical, enhancing the overall PVG efficiency some 30 000-fold. At an optimal
    irradiation time of 19 s, a 6.1-fold enhancement factor and an overall PVG efficiency of 43% were determined from a comparison of the response to direct solution nebulization
    when using a sample flow rate of 2 mL min−1 and 500 mg L−1 Cd2+ as a sensitizer. A limit of detection of 0.9 ng L−1 and repeatability (RSD) of 2% at 100 ng L−1 were achieved. Interference
    from inorganic acids (HNO3, HCl, H2SO4, and HF) was investigated with respect to analytical application to real samples. The accuracy and practical feasibility of this ultrasensitive methodology was successfully verified by analysis of Certified Reference
    Material CTA-FFA-1 (Fine Fly Ash) and six natural water samples with low W concentrations.
    Trvalý link: http://hdl.handle.net/11104/0300320

     
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