کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1204197 965144 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of carboxylic acids in water by gas chromatography using several detectors after flow preconcentration
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Determination of carboxylic acids in water by gas chromatography using several detectors after flow preconcentration
چکیده انگلیسی

A novel analytical method is reported that combines continuous solid-phase extraction and gas chromatography for the determination of 22 carboxylic acids in water. The highly polar and hydrophilic analytes were preferentially sorbed on a mixture of LiChrolut EN–Supelclean ENVI-18 (1:1) sorbent column and eluted with methanol; this extraction process did not require derivatisation. The extract was analysed by gas chromatography coupled to a flame ionisation detector as well as a mass spectrometer with electron impact (EI) or positive chemical ionisation modes. The highest sensitivity was achieved when using MS-EI, with good linearity in calibration curves and low detection limits (2–40 ng L−1) for 50 mL of sample. The entire procedure from raw aqueous sample to a ready-to-inject methanol solution of the acids requires less than 15 min. Another benefit of this method is the good accuracy (recoveries between 93 and 102%) and precision (relative standard deviation, 3.4–6.2%), which allows the determination of carboxylic acids in environmental water and in real chlorinated and ozonated drinking water.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1217, Issue 47, 19 November 2010, Pages 7440–7447
نویسندگان
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