کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9743887 | 1491201 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimization of aqueous acetylation for determination of hydroxy polycyclic aromatic hydrocarbons in water by stir bar sorptive extraction and thermal desorption-gas chromatography-mass spectrometry
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Stir bar sorptive extraction (SBSE) using a 10 mm-long stir bar coated with 24 μl of polydimethylsiloxane (PDMS) in combination with the thermal desorption technique and gas chromatography-mass spectrometry was used for determining hydroxy polycyclic aromatic hydrocarbons (OH-PAHs), particularly mono and diOH-PAHs having two- to four-ring structures, in water samples. To improve the recovery for OH-PAHs, in situ derivatization with acetic anhydride was applied prior to SBSE. The optimal conditions for a 10 ml water sample were attained with the addition of 100 mg of sodium hydrogen carbonate, followed by the addition of 20 μl of acetic anhydride and extraction for 360 min. In the selected ion monitoring (SIM) mode, the limits of detection were found to range from 0.27 ng lâ1 for 2-hydroxynaphthalene (as 2-hydroxynaphthalene acetate) to 25 ng lâ1 for 1,4-dihydroxynaphthalene (as 1,4-naphthoquinone) (S/N = 3). The low total recovery (<50%) of the entire procedure was mainly due to the low extraction efficiency of acetyl derivatives from water to PDMS, while the in situ derivatization step achieved more than 88% efficiency. Nine OH-PAHs, such as 1,4-naphthoquinone, 2-hydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,5-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, and 9-hydroxyphenanthrene, were detected in environmental samples under the optimal conditions. The detection of OH-PAHs in environmental water samples has not been reported so far.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 535, Issues 1â2, 11 April 2005, Pages 243-250
Journal: Analytica Chimica Acta - Volume 535, Issues 1â2, 11 April 2005, Pages 243-250
نویسندگان
Nobuyasu Itoh, Hiroaki Tao, Takashi Ibusuki,