Journal
ENVIRONMENTAL MONITORING AND ASSESSMENT
Volume 186, Issue 7, Pages 4507-4518Publisher
SPRINGER
DOI: 10.1007/s10661-014-3715-8
Keywords
Copper(II); Flame atomic absorption spectrometry; Modifier; 2,2 '-[Ethane-1,2-diylbis(thio)]dianiline (EDTD); Solid phase extraction
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Funding
- Office for Research Affairs, Islamic Azad University, Shahrood Branch
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This study reports a very selective, easy, and precise method for rapid separation of trace amounts of copper in aqueous samples using octadecyl silica-bonded phase membrane disks modified by 2,2'-[ethane-1,2-diylbis(thio)]dianiline (EDTD) combined with flame atomic absorption spectrometric determination. In addition, the synthesis and spectral characterization of EDTD have been described in detail. All the affecting experimental variables such as pH, amount of modifier, eluent type, sample and eluent flow rate, interfering ions, and disk capacity were also investigated. The target analyte (trace copper) was quantitatively retained at pH = 4 and eluted with 6.0 mL of 0.5 M HNO3 at flow rates of 40 and 10 mL min(-1) for analyte passage and elution steps, respectively, through the disks modified with 17.0 mg of EDTD. The proposed method also allows an enrichment factor of about 500 and has a detection limit of 0.005 ng mL(-1). The method has been successfully applied for isolation and determination of copper in different water samples, peppers, and standard alloys.
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