Preconcentration and Speciation of Chromium Using Dispersive Liquid-Liquid Microextraction; Application to Milk and Different Water Samples
عنوان مقاله: Preconcentration and Speciation of Chromium Using Dispersive Liquid-Liquid Microextraction; Application to Milk and Different Water Samples
شناسه ملی مقاله: JR_ANALCH-1-1_002
منتشر شده در در سال 1393
شناسه ملی مقاله: JR_ANALCH-1-1_002
منتشر شده در در سال 1393
مشخصات نویسندگان مقاله:
M. Adibmehr - Department of Chemistry, Islamic Azad University, Tehran Central Branch, Tehran , Iran
H. Bagheri Sadeghi - Department of Chemistry, Islamic Azad University, Tehran Central Branch, Tehran , Iran
Sh. Dehghan Abkenar - Department of Chemistry, Islamic Azad University, Savadkooh Branch, Mazandran, Iran
خلاصه مقاله:
M. Adibmehr - Department of Chemistry, Islamic Azad University, Tehran Central Branch, Tehran , Iran
H. Bagheri Sadeghi - Department of Chemistry, Islamic Azad University, Tehran Central Branch, Tehran , Iran
Sh. Dehghan Abkenar - Department of Chemistry, Islamic Azad University, Savadkooh Branch, Mazandran, Iran
A simple and rapid microextraction procedure based on dispersive liquid-liquid microextraction (DLLME) was developed for determination and speciation of trace amounts of chromium (Cr) by flame atomic absorption spectrometry (FAAS). In the proposed approach, chloroform and methanol were used as extraction and dispersive solvents. A new Schiff's base ligand, bis(۲-methoxy benzaldehyde) ethylene diimine was used as complexing agent. Effect of extraction solvent, disperser solvent, the volume of extraction and disperser solvent, pH of the aqueous solution and extraction time on extraction procedure were investigated and optimized. Under the optimum conditions, the calibration graph was linear in the range of ۱-۵۰ µg l-۱ with a limit of detection of ۰.۷ µg l-۱. The relative standard deviation (RSD%) was ۲.۷% (n = ۷) for Cr(III). The relative recoveries of spiked samples were between ۹۸% and ۱۰۲% and preconcentration factor (PF) was ۲۰. The proposed method is a simple, fast, accurate, highly stable and selective and was applied for determination of chromium in milk and water samples with satisfactory results.
کلمات کلیدی: Chromium, Dispersive liquid-liquid microextraction, Flame atomic absorption spectrometry, Speciation
صفحه اختصاصی مقاله و دریافت فایل کامل: https://civilica.com/doc/1597504/