In this research new adsorbents were prepared by modification of surfactant-coated g-alumina with three ligands; 1-(2-pyridylazo)-2-naphtol (PAN), dithizone (HDZ) and dimetyl golyoxime (DMG). The adsorbents were used for removal and pre-concentration of Pb+2, Cd+2, Ni+2, Cu+2, Co+2. Aqueous solutions of the me...

A simple and direct spectrophotometric methods for determination of zinc are based on reaction with azo dyes: 1-(2-pyridylazo)-2-naphtol (PAN) and Chromothrop 2B in the presence benzyldimethyldodecylammonium bromide (BDDABr) have been developed. Optimum concentrations of PAN, Chromothrop 2B, BDDABr and pH ensuring maximum absorbance were defined. The effect of foreign ions was elucidated. The c...

(II) is spectrophotometrically determined with 4-(2-pyridylazo)resorcinol (PAR) 1–4 in the presence of EDTA. This color reaction can never be carried out by a batch method because the stability constant of copper(II)-EDTA (log K = 18.8) is larger than that of copper(II)-PAR (log K = 14.8). 1 Therefore, PAR is used as an indicator in the EDTA titration of copper(II). We found that a color reacti...

We study the solvent-induced frequency shifts of the OH-stretching mode of 1-naphthol and 2-naphthol in nonpolar/weakly polar solvents, subject to electronic excitation, with ultrafast UV/mid-infrared pump-probe spectroscopy and theoretical modeling based on Pullin's perturbative treatment of vibrational solvatochromic effects. The model is parametrized at the density functional theory (DFT) le...