کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1168318 960584 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of a fast capillary electrophoresis method to determine inorganic cations in biodiesel samples
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Development of a fast capillary electrophoresis method to determine inorganic cations in biodiesel samples
چکیده انگلیسی

The aim of this study was to develop a fast capillary electrophoresis method for the determination of inorganic cations (Na+, K+, Ca2+, Mg2+) in biodiesel samples, using barium (Ba2+) as the internal standard. The running electrolyte was optimized through effective mobility curves in order to select the co-ion and Peakmaster software was used to determine electromigration dispersion and buffer capacity. The optimum background electrolyte was composed of 10 mmol L−1 imidazole and 40 mmol L−1 of acetic acid. Separation was conducted in a fused-silica capillary (32 cm total length and 23.5 cm effective length, 50 μm I.D.), with indirect UV detection at 214 nm. The migration time was only 36 s. In order to obtain the optimized conditions for extraction, a fractional factorial experimental design was used. The variables investigated were biodiesel mass, pH, extractant volume, agitation and sonication time. The optimum conditions were: biodiesel mass of 200 mg, extractant volume of 200 μL and agitation of 20 min. The method is characterized by good linearity in the concentration range of 0.5–20 mg kg−1 (r > 0.999), limit of detection was equal to 0.3 mg kg−1, inter-day precision was equal to 1.88% and recovery in the range of 88.0–120%. The developed method was successfully applied to the determination of cations in biodiesel samples.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 673, Issue 2, 19 July 2010, Pages 200–205
نویسندگان
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