Selective determination of chromium(VI) ions using in-tube electro-membrane extraction followed by flame atomic absorption spectrometry

Abstract

In the present work, a novel and efficient method, namely in-tube electro-membrane extraction followed by flame atomic absorption spectrometry (IEME-FAAS), is used for the selective determination of chromium(VI) ions in some environmental samples. In this approach, which is based upon the electro-kinetic migration of ionized compounds, by applying an electrical potential difference, the analyte is extracted from an aqueous sample solution through a supported liquid membrane (SLM) into an acceptor solution. A thin polypropylene (PP) sheet placed inside a tube acts as a support for the membrane solvent used, and 100 μL of an aqueous acceptor solution is separated by this solvent from 5.0 mL of an aqueous donor solution. In order to achieve the best extraction efficiency, the effective parameters involved including the voltage magnitude, SLM solvent, extraction time, and pH range are optimized. Under the optimized experimental conditions, the IEME-FAAS method provides a good linearity in the range of 10.0-600 ng mL-1 , a low limit of detection (3.0 ng mL-1), and good extraction repeatabilities (RSDs below 8.6%, n = 5). Finally, the developed method is used for the selective determination of chromium(VI) ions in the tap, river, and mineral water samples.

A review: Analytical methods for heavy metals determination in environment and human samples

“…By optimizing, the linear range, limit of detection and preconcentration factor were achieved 0.03-4.4 µg L −1 , 0.005 µg L −1 , and 10 respectively [163,164]. Also, chromium speciation was reported by other researcher [165][166][167][168][169][170][171][172]. Xiaogang Luo et al explained a novel sorbent for absorption heavy metals from waters by syntesis of MCB.…”

Spectrophotometric Method for Determination of Chromium Ion in Aqueous Solution Using Ninhydrin

“…There are several methods for chromium ion measurement in the literature; the most frequently used are ultraviolet-visible (UV-Vis) spectrophotometry [4], high-performance liquid chromatography [5], capillary electrophoresis [6], Adsorptive Stripping Voltammetry [7], flame and furnace atomic adsorption spectroscopy [8] [9], and mass spectrometry [10]. Because of its simplicity, sensitivity, accuracy, and speed, the spectrophotometric method holds a special place in science.…”

A comparative study on the monovalent and divalent cation separation of polymeric films and membranes from salt solutions under diffusion-dialysis

“…In the last a few decades, different approaches were used for the development of appropriate separation materials. These are; insertion of metal oxides to polymeric membranes [8][9][10], designing nanocomposite structured polymeric membranes [11][12][13], thin film composite (TFC) membranes [14][15][16], liquid membranes [17], electromembranes [18,19]. In particular, the separation of some ions with low charge and small atomic diameter is really hard and hence it would be very useful to find good candidates for ion removal with high selectivity.…”