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Received February 22, 2009
Accepted May 6, 2009
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Preconcentration and determination of chromium in water with flame atomic absorption spectrometry by thiourea-formaldehyde as chelating resin
Department of Chemistry, Islamic Azad University, Central Tehran Branch, Iran 1Department of Chemistry, Islamic Azad University, North Tehran Branch, Iran 2Department of Sea Chemistry, Faculty of Marin of Sciences and Technology, Islamic Azad University, North Tehran Branch, Iran 3Department of Chemistry, Islamic Azad University, Varamin (Pishva) Branch, Iran
Korean Journal of Chemical Engineering, November 2009, 26(6), 1723-1728(6), 10.1007/s11814-009-0275-7
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Abstract
Thiourea-formaldehyde chelating resin is synthesized simply and rapidly from thiourea and formaldehyde by condensation polymerization and characterized by IR spectra and studied for the preconcentration and determination of trace Cr(III) ion from solution samples. The optimum pH value for sorption of the metal ion was 6.5. The sorption capacity of resin for Cr(III) was determined. The chelating resin can be reused for 20 cycles of sorption-desorption without any significant change in sorption capacity. A recovery of 96% was obtained for the metal ion with 0.5M HNO3 as eluting agent. The equilibrium adsorption data of Cr(III) on modified resin were analyzed by Langmuir, Freundlich and Temkin models. Based on equilibrium adsorption data the Langmuir, Freundlich and Temkin constants were determined as 0.016, 0.040 and 0.074 at pH 6.5 and 20 ℃. The method was applied for chromium ion determination from river water sample.
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Rauf Iftikhar A, Nawaz Bhatti H, Asif Hanif M, Nadeem R, J. Hazard. Mater., 161, 941 (2009)
Sprynskyy M, J. Hazard. Mater., 161, 1377 (2009)
Romero-Gonzalez J, Walton JC, Peralta-Videa JR, Rodriguez E, Romero J, Gardea-Torresdey JL, J. Hazard. Mater., 161, 360 (2009)
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Prasada Rao T, Preetha CR, Sep. Purif. Rev., 32, 1 (2003)
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Masque N, Marce RM, Borull F, Trends. Anal. Chem., 17, 384 (1998)
Preetha CR, Gladis JM, Prasada Rao T, Talanta, 58, 701 (2002)
Metilda P, Sanghamitr K, Mary Gladis J, Naidu GRK, Prasada Rao T, Talanta, 65, 192 (2005)
Alkan M, Dogan M, Fresen. Environ. Bull., 12, 418 (2003)
Langmuir L, J. Am. Chem. Soc., 40, 1361 (1918)
Hall KL, Eagleton LC, Acrivos A, Vermeulen T, Ind. Eng. Chem. Fundam., 5, 212 (1966)
Freundlich HMA, J. Phys. Chem., 57, 385 (1906)
