caa a22 4500 46321921X CHVBK 20180405153207.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1134/S1061934807070039 doi (NATIONALLICENCE)springer-10.1134/S1061934807070039 Simultaneous spectrophotometric determination of copper(II) and zinc(II) based on their kinetic separation in flow-injection systems [Elektronische Daten] [L. Shpigun, Ya. Shushenachev, P. Kamilova] Flow-injection methods are developed for the spectrophotometric analysis of binary copper(II) and zinc(II) mixtures. They are based on measurements of a differential kinetic signal caused by ligand-exchange reactions that occur in the flow between the complexes of these metals with the same chromogenic reagent (4-(2-pyridylazo)-resorcinol or zincon) and aminopolycarboxylic acids. Two different approaches are used for the kinetic separation (or masking) of these metals followed by the on-line processing of the recorded signal by regression analysis. One of them is monitoring an indicator reaction in the stopped-flow mode, and the other is recording the separated peaks in the flow-injection system with two reaction zones reaching the detector over certain periods. The optimum detection conditions were found (c min = 0.03 μg/mL), which allow the detection of the studied metal ions in mixtures in a ratio of no more than 1: 5 with a relative error of no more than 5%, good precision (RSD < 10%, n = 6, P = 0.95), and high throughput (90 h−1). The developed procedures were tested in the analysis of model mixtures and pharmaceutical preparations. Pleiades Publishing, Ltd., 2007 Shpigun L. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, 119991, Moscow, Russia aut Shushenachev Ya Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, 119991, Moscow, Russia aut Kamilova P. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, 119991, Moscow, Russia aut Journal of Analytical Chemistry Nauka/Interperiodica 62/7(2007-07-01), 623-631 1061-9348 62:7<623 2007 62 10809 https://doi.org/10.1134/S1061934807070039 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061934807070039 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shpigun L. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Shushenachev Ya Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Kamilova P. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Journal of Analytical Chemistry Nauka/Interperiodica 62/7(2007-07-01), 623-631 1061-9348 62:7<623 2007 62 10809 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer