Preconcentration and determination of chromium in water with flame atomic absorption spectrometry by thiourea-formaldehyde as chelating resin |
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Authors: | Homayon Ahmad Panahi Amir Abdollah Mehrdad Sharif Mehrnaz Bigonah Elham Moniri |
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Affiliation: | (1) Laboratoire de Chimie et Environnement, EA 2678, Université de Provence, 3 Place Victor Hugo, Case 29, 13331 Marseille Cedex 3, France;(2) Laboratoire de Chimie Appliquée, MFS EA 1356, ISITV, Université de Toulon et du Var, Avenue George Pompidou, BP 56, 83162 La Valette du Var, France; |
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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°C. The method was applied for chromium ion determination from river water sample. |
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