Cloud Point Extraction Method For Determinationnickel In Different Water Samples Using An Imidazole Derivative

Abstract

According to the cloud point extraction method(CPE), nickel ions were preconcentrated and separated in water samples by
forming a complex with the organic reagent 2-[4-carboxymethylphenylazo]-4,5-diphenylimidazole(4-CMePADI).This method
included adding ethanol at a volume of 5mL to the cloud point layer before analysis and using a UV-Vis spectrophotometer.
It had a wavelength for final absorbance under λmax=540 nm. Limited optimum conditions in this work, such as pH, nickel
concentration, the volume of TritonX-100 (octylpoly ethylene glycol phenyl ether), heating time, temperature, and
interference effects were reported. Stoichiometry for the formed complex, which investigation clarifies that the extracted
species was under the status of 1:1 [reagent: nickel]. Also, this method applies to the quantitative determination of nickel
(II) in different water samples. The limit of detection (LOD) of nickel ions is 3.0705ppm , Limit of Quantity (LOQ)
is10.2535ppm and Sensitivity (S) is 0.017ppm