کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7683328 | 1495819 | 2013 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Simultaneous liquid-liquid extraction and dispersive solid-phase extraction as a sample preparation method to determine acidic contaminants in river water by gas chromatography/mass spectrometry
ترجمه فارسی عنوان
استخراج مایع همزمان و استخراج جامدات فشاری به عنوان یک روش آماده سازی نمونه برای تعیین آلاینده های اسیدی در آب های رودخانه توسط کروماتوگرافی گاز / طیف سنج جرمی
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کلمات کلیدی
آلاینده های اسیدی، مایع استخراج مایع، استخراج فاز جامد فشرده، کروماتوگرافی گازی، اعتبار سنجی، عدم قطعیت،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
A sample preparation procedure that combines a liquid-liquid extraction (LLE) with a dispersive solid-phase extraction (DSPE) has been devised to determine residues of four phenoxyacid herbicides, two aminopolycarboxylic acids and five acidic anti-inflammatory drugs in small volumes of river water samples. Two aliquots of acetone (3 and 0.5 mL) were used to extract the analytes from a 10 mL water sample at pH 2 containing 5 mg of octadecylsilane (ODS) sorbent and NaCl at a 5.5 M concentration. Acetone was isolated by the salting-out effect, collected, evaporated and the extract was treated with BF3/methanol to obtain the methyl esters of the analytes and determine them by GC with mass spectrometric detection. Recoveries were comprised between 82% and 114% with relative standard deviations about 5-15% (n=5) within a concentration range about 0.03-44 µg Lâ1. The amount of ODS added to sample resulted to be a significant factor in the recovery for most of the analytes as deduced from an experimental design; the sample pH was not a so critical factor. A robustness study of the proposed sample preparation was carried out as defined by Youden and Steiner and an estimation of the uncertainties of the measured concentrations was made following the EURACHEM/CITAC guidelines, too.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Talanta - Volume 116, 15 November 2013, Pages 678-687
Journal: Talanta - Volume 116, 15 November 2013, Pages 678-687
نویسندگان
Juan J. Jiménez,