Abstract-A method was developed for preparing a chelating amino polymer, pyridylethylpolyethylenimine with maximal degree of substitution, by polymer-analogous transformations of branched polyethylenimine in reaction with 2-vinylpyridine. The ability of cross-linked pyridylethylpolyethylenimine with the degree of substitution of 0.32 to sorb Cu 2+ , Ni 2+ , Co 2+ , Zn 2+ , Cd 2+ , Mn 2+ , and Pb 2+ ions present simultaneously in solution was evaluated. In an ammonium acetate sorption system (pH 3.5-4.0), the sorbent selectively interacts with Cu(II) ions.
Analytical characteristics of N,N-di(2-carboxyethyl)aniline ( I ), N,N-di(2-carboxyethyl)-3,4-xylidine ( II ), N-(2-carboxyethyl)anthranilic acid ( III ), N,N-di(2-carboxyethyl)-4,5-dimethylaminoazobenzene-4'-sulfonic acid ( IV ), and N-(2-carbamoylethyl)anthranilic acid ( V ) were studied. The factors affecting the selectivity of I -V for Cu(II) ions (basicity of the amino group, nature and positions of substituents in the benzene ring, and geometry of chelate cycles) were analyzed. The optimum conditions were found and procedures were developed for the spectrophotometric determination of copper in metallurgical products. The high selectivity of I -V for Cu(II) ions allows the determination without preliminary separation of concomitant components in aqueous solutions without organic solvents. Compound II exhibits the best analytical characteristics: the analytical range of copper 3-20 mg/L, detection limit 0.7 mg/L, ε ( λ = 252 nm) = 3290 L mol -1 cm -1 , and pH 6.0 (ammonia-acetate buffer solution).
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