Quantitative Analysis of The Inorganic Content in Aqueous Solutions Based on Selective Membrane Dialysis and Electric Current Measurement
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Department of Inorganic and Analytical Chemistry, Prof. Dr. Assen Zlatarov University, 8010 Bоurgas, Bulgaria
Anastas Dimitrov Dakashev   

Department of Inorganic and Analytical Chemistry, Prof. Dr. Assen Zlatarov University, 8010 Bоurgas, Bulgaria
Online publication date: 2007-10-01
Publication date: 2007-10-01
Eurasian J Anal Chem 2008;3(1):56–69
Quantitative chemical analysis of ion species in aqueous solutions is performed. It is based on dialysis in an aqueous solution with ion exchange membranes and indication of the dialysis process by galvanic current created in a dialysis cell having one or two membranes. An analyte solution is set on one side of the membrane(s) and water on the other side of the membrane(s). A standard solution of the species under investigation is added to a measured volume of the water in a stepwise manner. Thus a solution with known concentration is created after every single addition of the standard solution. Different concentration gradients of analyte species form across the membrane(s) in this way. The analyte concentration is determined by finding graphically the standard solution volume corresponding to the zero concentration gradient. Five different modifications of the method are developed allowing analysis of concentrated solutions, fast or more accurate and precise determination, as well as pH determination. The method can be applied to the analysis of mineral content in sea water, mineral water and sylvenite.
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