کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1165954 1491127 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Polypyrrole/hexagonally ordered silica nanocomposite as a novel fiber coating for solid-phase microextraction
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Polypyrrole/hexagonally ordered silica nanocomposite as a novel fiber coating for solid-phase microextraction
چکیده انگلیسی

A highly porous fiber coated polypyrrole/hexagonally ordered silica (PPy/SBA15) materials were prepared for solid-phase microextraction (SPME). The PPy/SBA15 nanocomposite was synthesized by an in situ polymerization technique. The resulting material was characterized by the scanning electron microscopy, thermogravimetric analysis and differential thermal analysis. The prepared nanomaterial was immobilized onto a stainless steel wire for fabrication of the SPME fiber. The fiber was evaluated for the extraction of some polycyclic aromatic hydrocarbons (PAHs) from aqueous sample solutions in combination with gas chromatography–mass spectrometry (GC–MS). A one at-the-time optimization strategy was applied for optimizing the important extraction parameters such as extraction temperature, extraction time, ionic strength, stirring rate, desorption time and desorption temperature. In optimum conditions (extraction temperature 70 °C, extraction time 20 min, ionic strength 20% (W V−1), stirring rate 500 rpm, desorption temperature 270 °C, desorption time 5 min) the repeatability for one fiber (n = 3), expressed as relative standard deviation (R.S.D. %), was between 5.0% and 9.3% for the tested compounds. The quantitation limit for the studied compounds were between 13.3 and 66.6 pg mL−1. The life span and stability of the PPy/SBA15 fiber are good, and it can be used more than 50 times at 260 °C without any significant change in sorption properties. The developed method offers the advantage of being simple to use, with shorter analysis times, lower cost of equipment, thermal stability of fiber and high relative recovery in comparison to conventional methods of analysis.

Figure optionsDownload as PowerPoint slideHighlights
► The polypyrrole/SBA15) nanocomposite was used as a novel coating for SPME fiber.
► The proposed fiber was used for the extraction of polycyclic aromatic hydrocarbons.
► The proposed SPME fiber is thermal stable, and it has a low limit of detection.
► The SPME fiber was applied in polluted river water and wastewater samples.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 704, Issues 1–2, 17 October 2011, Pages 174–179
نویسندگان
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