Pre-concentration of water samples with BEA zeolite for the direct determination of polycyclic aromatic hydrocarbons with laser-excited time-resolved Shpol'skii spectroscopy

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Microchemical Journal, ISSN: 0026-265X, Vol: 110, Page: 246-255

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Walter B. Wilson; Andréia A. Costa; Huiyong Wang; Andres D. Campiglia; José A. Dias; Sílvia C.L. Dias
Elsevier BV
Chemistry; Zeolites; BEA; Polycyclic aromatic hydrocarbons; Solid-phase extraction; Laser-excited time-resolved Shpol'skii spectroscopy; Shpol'skii; spectroscopy; Water analysis; SOLID-PHASE EXTRACTION; PERFORMANCE LIQUID-CHROMATOGRAPHY; MOLECULAR-WEIGHT 302; MULTIDIMENSIONAL FLUORESCENCE SPECTROSCOPY; 15; PRIORITY POLLUTANTS; DRINKING-WATER; LUMINESCENCE SPECTROSCOPY; DIBENZOPYRENE ISOMERS; NANO-EXTRACTION; FACILE METHOD; Chemistry; Analytical
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A unique method for screening fifteen US Environmental Protection Agency polycyclic aromatic hydrocarbons (EPA-PAHs) in drinking and lake water samples is reported. One milliliter volume of water sample is mixed and centrifuged with 2 mg of BEA zeolite. The precipitate is subsequently treated with equal volumes (100 μL) of a 70/30 methanol–water mixture and n-octane. Fifteen EPA-PAHs are directly determined (no chromatographic separation) in the layer of n-octane via 4.2 K laser-excited time-resolved Shpol'skii spectroscopy. A mathematical equation is derived to correlate the PAH concentration in the water sample to its concentration in the layer of Shpol'skii solvent (n-octane). Qualitative and quantitative analyses are based on the collection of wavelength–time matrices, i.e. data formats that carry with them spectral and lifetime information. With 1 mL of water, the limits of detection varied from 1.1 ng L −1 (benzo[ a ]pyrene) to 194 ng L −1 (naphthalene). The analytical recoveries of the new method are in good agreement with those obtained via high-performance liquid chromatography. The simplicity of the experimental procedure and the use of microliters of organic solvent make the new method a valuable and environmentally friendly alternative for the routine monitoring of EPA-PAHs in water samples.