University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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NRC GBW 08607

Citations 1

"Continuous Liquid-liquid Extraction System With A Sandwich Type Phase Separator For The Determination Of Copper As The Copper(I)-bathocuproine Complex"
Bol. Soc. Chilena Quim. 1999 Volume 44, Issue 4 Pages 451-458
RICHTER, PABLO, TORAL, M. INES and MANRIQUEZ, ROBERTO

Abstract: In this work a method for determination of copper at low concentration levels is proposed by using a continuous flow manifold in which the liquid-liquid extraction step for extracting the copper from the aqueous matrix is automated. The analyte is transferred into 1,2 dichloroethane as the colored complex Cu(I)-bathocuproine-counter ion. The manifold also contains a sandwich type membrane separator which is used after the extraction process. This phase separator provides the channel of the outlet organic stream free of aqueous phase, thus avoiding the interference with the transiently detection process at 478 nm. By keeping the chemical and hydrodynamic variables of the method in the optimal condition, it was found that copper can be determined from 64.5 ng/mL to 4000 ng/mL, with a detection limit of 19.3 ng/mL. The repeatability of the method for concentrations of 200 and 1000 ng/mL, expressed as variation coefficient, were of 3.77% and 1.08%, respectively The sampling rate was 22 h-1. The accuracy of the method was tested by using the certified reference material for elements in waters GBW 08607. The relative error between the found and the certified value was + 2.9%.
Copper Spectrophotometry Extraction Membrane Interferences Optimization Reference material