Extraction studies of metal complexes with some macrocyclic tetraaza ligands and xanthene dyes : Spectrophotometric determination of Cadmium(II) with Tetramethyltetraazacyclotetradecane and Erythrosin A |
| |
Authors: | Walenty Szczepaniak Bernard Juskowiak Wanda Ciszewska |
| |
Institution: | Department of Instrumental Analysis, Faculty of Chemistry, A. Mickiewicz University, ul. Grunwaldzka 6, 60-780 Poznań Poland |
| |
Abstract: | The liquid-liquid extraction of ion-pair complexes of zinc(II), copper(II) and cadmium(II) is described. The macrocyclic ligands 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane (4Me-cyclam-14) and rac-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (Tet b) are used with xanthene dyes as the counter ions. The apparent extraction constants (D′c) are reported. The sequences of extraction efficiency of both ligands are related to the structure of the complexes. The apparent molar absorptivity of the Cd(4Me-cyclam-14)—erythrosin A ion-associate is 1.1 × 105 l mol? cm?1. The calibration graph is linear over the range 0—10?5 M, which allows even 0.05 μg ml?1 cadmium to be determined in a 0.5 M sodium hydroxide medium. No interference was observed from Ni2+, Pb2+, Zn2+, Mg2+, Sn4+, Ga3+, Al3+ and Fe3+. Interferences were Cu2+, Hg2+, Ag+ and large anions. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|