ABSTRACT
A chelating resin is prepared by condensation polymerization of aniline with formaldehyde and characterized by FT-IR, elemental analysis and studied for the preconcentration and determination of trace Platinum ion from environmental water sample using inductively coupled plasma-atomic emission spectroscopy [ICP-AES]. The optimum pH value for sorption of the metal ions was 5. The maximum adsorption capacities of resin [aniline- formaldehyde] were determined as 21.25, 14.72 and 11.9 mg/g at different temperatures 20, 30 and 40°C, respectively. The best desorption of the metal ions from resin was obtained by 0.5 mol/L nitric acid as eluting agent. The profile of Platinum uptake on this sorbent reflects good accessibility of the chelating sites in the aniline-formaldehyde. The equilibrium adsorption data of Platinum ion modified resin were analyzed by four isotherm models such as Langmuir, Freundlich ,Temkin and Redlich-Peterson. Langmuir isotherm parameters obtained from the four Langmuir linear equations by using linear method, Langmuir-1 is the most popular linear form, and it had the highest coefficient of determination compared with the other Langmuir linear equations. The thermodynamic parameters [DELTAG, DELTAH, and DELTAS] were also determined using the equilibrium constant values obtained at different temperatures. The results showed that the adsorption for Pt [IV] ion was spontaneous nature and exothermic. The method was applied for Platinum ions determination from tap water sample