pre-concentration and determination of platinum (iv) in water samples using chelating resin by inductively coupled plasma atomic emission spectroscopy (icp-aes)

a chelating resin is prepared by condensation polymerization of aniline with formaldehyde andcharacterized by ft-ir, elemental analysis and studied for the preconcentration and determination of traceplatinum 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 capacitiesof 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 nitricacid as eluting agent. the profile of platinum uptake on this sorbent reflects good accessibility of the chelatingsites in the aniline-formaldehyde. the equilibrium adsorption data of platinum ion modified resin were analyzedby four isotherm models such as langmuir, freundlich ,temkin and redlich–peterson. langmuir isothermparameters obtained from the four langmuir linear equations by using linear method, langmuir-1 is the mostpopular linear form, and it had the highest coefficient of determination compared with the other langmuirlinear equations. the thermodynamic parameters (δg°, δh°, and δs°) were also determined using the equilibriumconstant values obtained at different temperatures. the results showed that the adsorption for pt (iv) ion wasspontaneous nature and exothermic. the method was applied for platinum ions determination from tap watersample.