Speciation of chromium in environmental samples by dual electromembrane extraction system followed by high performance liquid chromatography |
| |
Authors: | Meysam Safari Saeed NojavanAmin Morteza-Najarian |
| |
Institution: | Faculty of Chemistry, Shahid Beheshti University, G. C., 1983963113 Evin, Tehran, Iran |
| |
Abstract: | This study proposes the dual electromembrane extraction followed by high performance liquid chromatography for selective separation-preconcentration of Cr(VI) and Cr(III) in different environmental samples. The method was based on the electrokinetic migration of chromium species toward the electrodes with opposite charge into the two different hollow fibers. The extractant was then complexed with ammonium pyrrolidinedithiocarbamate for HPLC analysis. The effects of analytical parameters including pH, type of organic solvent, sample volume, stirring rate, time of extraction and applied voltage were investigated. The results showed that Cr(III) and Cr(VI) could be simultaneously extracted into the two different hollow fibers. Under optimized conditions, the analytes were quantified by HPLC instrument, with acceptable linearity ranging from 20 to 500 μg L−1 (R2 values ≥ 0.9979), and repeatability (RSD) ranging between 9.8% and 13.7% (n = 5). Also, preconcentration factors of 21.8–33 that corresponded to recoveries ranging from 31.1% to 47.2% were achieved for Cr(III) and Cr(VI), respectively. The estimated detection limits (S/N ratio of 3:1) were less than 5.4 μg L−1. Finally, the proposed method was successfully applied to determine Cr(III) and Cr(VI) species in some real water samples. |
| |
Keywords: | APDC ammonium pyrrolidinedithiocarbamate CPE cloud point extraction DEME dual electromembrane extraction FAAS flame atomic absorption spectroscopy HF hollow fiber ICP inductively coupled plasma NPOE 2-nitrophenyl octyl ether |
本文献已被 ScienceDirect 等数据库收录! |
|