Pre-concentration and Determination of Platinum (IV) in Water Samples Using Chelating Resin by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES)

Abstract

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