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

Document Type: Original Research Paper

Authors

1 Nuclear Fuel Cycle School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box 11365-3486, Tehran, Iran

2 Graduate Faculty of Environment, University of Tehran, P.O. Box 14155-6135, Tehran, Iran

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 (ΔG°, ΔH°, and ΔS°) 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.

Keywords