Solid phase extraction of arsenic for the enrichment from aqueous environment using a modified cellulose surface

Department of Chemistry, University of Kalyani, Kalyani-741 235, West Bengal, India
E-mail : mitali_ku@yahoo.com
Manuscript received 22 June 2010, accepted /6 August 2010

Iron loaded cellulose is found to have the potential to act as a solid phase extractant for the removal and
enrichment of arsenic from aqueous environment. The eqllilibrium is found to attain at 135 min. The process is found
to be innuenced by the pH of the solution and the extent of extraction depends on the initial arsenic concentration as
well the solution temperature. The role of different foreign anions innuencing the extraction extent is determined. Of
the different isotherm tested the equilibrium data is best fitted to the three parameters Sips model rather than the t"o
parameters Langmuir and Freundlich models. The goodness of data fit was evaluated through regression coefficient.
standard error of estimate and chi squarr parameters. The process Is aided by negative free energ), positive enthalpy
and positive entropy change. The applicability of the process in sample solution is tested through an off-line SPE-AAS/
CV combination.