PRE-CONCENTRATION OF Cd, Cu, Ni, Pb and Zn FROM FUEL ETHANOL AND NATURAL WATER SAMPLES BY SORPTION ON P-AMINOBENZOIC MODIFIED CELLULOSE AND SUBSEQUENT FLAME AAS DETERMINATION
Abstract:
This work describes the synthesis of p-aminobenzoic modified cellulose (Cell-PAB), and the results of a study on the sorption and pre-concentration (using batch and in flow-through column methods) of Cd(II), Cu(II), Ni(II), Pb(II) and Zn(II) in ethanol and aqueous medium. The sorption capacities for each metal ion were (in mmol.g<sup>-1</sup>); Ethanol medium: Cd(II) = 1.45, Cu(II) = 1.85, Ni(II) = 1.65, Pb(II)= 1.40 and Zn(II)= 1.50; Aqueous medium: Cd(II)= 1.30, Cu(II)= 1.80, Ni(II)= 1.50, Pb(II)= 1.20 and Zn(II)= 1.40. A recovery of almost 100% of the metal ions was obtained from ethanol as well as aqueous medium, the ions being sorbed in a column packed with 1 g of Cell-PAB, using 5 mL of 2.0 mol L<sup>-1</sup> HCl solution as eluent. An enrichment factor of 45 (250 mL sample, 5 mL concentrate) was obtained by this preconcentration procedure. The sorption desorption procedure applied allowed the development of a preconcentration method for metal ions at trace level in fuel ethanol and natural water samples. After elution, the metal ions were determined by flame atomic absorption spectrometry.
This work describes the synthesis of p-aminobenzoic modified cellulose (Cell-PAB), and the results of a study on the sorption and pre-concentration (using batch and in flow-through column methods) of Cd(II), Cu(II), Ni(II), Pb(II) and Zn(II) in ethanol and aqueous medium. The sorption capacities for each metal ion were (in mmol.g<sup>-1</sup>); Ethanol medium: Cd(II) = 1.45, Cu(II) = 1.85, Ni(II) = 1.65, Pb(II)= 1.40 and Zn(II)= 1.50; Aqueous medium: Cd(II)= 1.30, Cu(II)= 1.80, Ni(II)= 1.50, Pb(II)= 1.20 and Zn(II)= 1.40. A recovery of almost 100% of the metal ions was obtained from ethanol as well as aqueous medium, the ions being sorbed in a column packed with 1 g of Cell-PAB, using 5 mL of 2.0 mol L<sup>-1</sup> HCl solution as eluent. An enrichment factor of 45 (250 mL sample, 5 mL concentrate) was obtained by this preconcentration procedure. The sorption desorption procedure applied allowed the development of a preconcentration method for metal ions at trace level in fuel ethanol and natural water samples. After elution, the metal ions were determined by flame atomic absorption spectrometry.
DOI: 10.48141/SBJCHEM.v8.n9.2000.110_2000.pdf
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