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Title: Online solid-phase extraction coupled to flame atomic absorption spectrometry for determination of trace amounts of copper (II) ion in water samples
Authors: Hosseini, Mehdi
Dalali, Nasser
Keywords: Copper
Flame atomic absorption spectrometry
Flow injection
Issue Date: Sep-2012
Publisher: NISCAIR-CSIR, India
Abstract: A solid phase extraction-flow injection procedure for online determination of <span style="mso-bidi-font-weight:bold">Cu(II) by flame atomic absorption spectrometry (FI-AAS) has been reported. The metal ions are retained as Cu(I)-neocuproine<sup> </sup>complex in a mini-column filled with octadecyl bonded silica (C<sub>18</sub>) as sorbent material. Quantitative extraction has been obtained at <i>p</i>H 5.0. The retained metal ions are then eluted efficiently with ethanol<sup> </sup>into the nebulizer of <span style="mso-bidi-font-weight:bold">flame atomic absorption spectrometer for on-line determination. Different variables affecting the preconcentration efficiency, including <i>p</i>H, neocuproine concentration, eluent type, sample, eluent flow rates and sample loading time, are optimized. Two minute preconcentration at flow rate of 6 mL min<sup>-1</sup> provides the enhancement factor of 100<span style="mso-bidi-font-weight:bold"> for Cu(II). The detection limit (3σ) is<span style="mso-bidi-font-weight:bold"> found to be <span style="mso-bidi-font-weight:bold">0.15 µg L<sup>-1</sup>for Cu(II), and the <span style="mso-bidi-language:FA" lang="EN-GB">relative standard deviation at 5.0 μg L<sup>-1</sup> of target metal ions <span style="mso-bidi-language:FA" lang="EN-GB">is 1.2% (<i>n</i>=7). <span style="mso-bidi-language:FA" lang="EN-GB">The accuracy has been assessed by analysis of certified reference materials CASS-4 and CRM1643d<span style="mso-bidi-language: FA" lang="EN-GB">, and the obtained results are found in good agreement with certified amounts of Cu(II). The procedure has been applied successfully to <span style="mso-bidi-language:FA" lang="EN-GB">Cu(II) ion determination in water samples.<b> </b> </span></span></span></span></span></span></span></span></span></span>
Description: 337-341
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.19(5) [September 2012]

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