کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7643719 | 1494884 | 2013 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
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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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Pre-concentration of water samples with BEA zeolite for the direct determination of polycyclic aromatic hydrocarbons with laser-excited time-resolved Shpol'skii spectroscopy Pre-concentration of water samples with BEA zeolite for the direct determination of polycyclic aromatic hydrocarbons with laser-excited time-resolved Shpol'skii spectroscopy](/preview/png/7643719.png)
چکیده انگلیسی
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 Lâ 1 (benzo[a]pyrene) to 194 ng Lâ 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microchemical Journal - Volume 110, September 2013, Pages 246-255
Journal: Microchemical Journal - Volume 110, September 2013, Pages 246-255
نویسندگان
Walter B. Wilson, Andréia A. Costa, Huiyong Wang, Andres D. Campiglia, José A. Dias, SÃlvia C.L. Dias,