Title:Solid Phase Extraction of Pb(II) in Water Samples on Amberlyst 36 and Determination of the Equilibrium, Kinetic and Thermodynamic Parameters of the Adsorption
Volume: 9
Issue: 3
Author(s): Adalet Tunceli, Ozcan Yalcinkaya and Ali Rehber Turker
Affiliation:
Keywords:
Lead, preconcentration, solid phase extraction, amberlyst 36, FAAS, thermodynamic parameters
Abstract: The adsorption parameters of Pb(II) on the Amberlyst 36 were investigated and solid phase extraction was applied
for the preconcentration of lead ions. Flame atomic absorption spectrometry was used for detection. The recovery of
lead at optimum parameters such as pH (2), elution solution type and volume (5 mL of 3 mol/L HCl solution), flow rate (3
mL/min) etc. was obtained as (98.4±1.6) % at confidence level of 95% for eight measurements. The relative standard deviation
of the recovery was about 1.9%. The analytical detection limit calculated by dividing the instrumental detection
limit by the enrichment factor (150) was 0.68 μg/L. The matrix effect on the adsorption was also investigated and the application
of proposed method to the real samples was done. The accuracy of the method was controlled with applying the
standard reference material (CWW-TM-D Waste Water) containing lead. Kinetic studies were performed to determine the
kinetic parameters and the thermodynamic parameters. The process of lead adsorption was found to be follow pseudo second-
order rate expression and obey the Langmuir's isotherm model with the maximum adsorption capacity of 232.6 mg/g
at 328 K. Thermodynamic parameters such as the changes of standard free energy (ΔG°), enthalpy (ΔH°) and entropy
(ΔS°) were also evaluated. According to results, the adsorption of Pb(II) on to Amberlyst 36 is a spontaneous, endothermic
and ion-exchange process.
