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On-line extraction and determination of uranium in aqueous samples using multi-walled carbon nanotubes-coated cellulose acetate membrane

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In this work, multi-walled carbon nanotubes (MWCNTs)-coated cellulose acetate membrane was used for on-line extraction and pre-concentration of uranium from aqueous samples prior to inductively coupled plasma optical emission spectrometry (ICP-OES) determination. Sample solutions containing the U(VI)-2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP) complex were passed through the membrane. The adsorbed analyte was subsequently eluted from the membrane with acid, which was directly introduced into the ICP-OES nebuliser. The main variables affecting the pre-concentration and determination steps of uranium were studied and optimised. Under the optimised conditions, the enrichment factor of 150 and the detection limit of 0.16 μg L–1 were obtained. This method was successfully used for determination of uranium in environmental water samples.
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Keywords: ICP-OES; Uranium; cellulose acetate membrane; multi-walled carbon nanotube; on-line solid-phase extraction

Document Type: Research Article

Affiliations: NFCRS, Nuclear Science and Technology Research Institute, Tehran, Iran

Publication date: February 19, 2016

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