期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
卷 96, 期 3, 页码 203-211出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/03067319.2015.1137909
关键词
on-line solid-phase extraction; ICP-OES; cellulose acetate membrane; Uranium; multi-walled carbon nanotube
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 mu gL(-1) were obtained. This method was successfully used for determination of uranium in environmental water samples.
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