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Title:Determination of cyanide ion in natural waters with a selective ion electrode
Author(s):Rands, D.G.; Bain, R.L.
Contributor(s):Southern Illinois University at Edwardsville
Subject(s):Water resource development--Illinois
Water resource development
Water quality
Water analysis
Iron cyanides
Cyanide electrode
Free cyanide
Ion electrodes
Geographic Coverage:Illinois (state)
Abstract:The analysis of cyanide ion in natural water systems is complicated by the fact that natural waters contain certain metal ions which form extremely stable metal-cyano complexes. Current methods involve distillation techniques to separate cyanide from the sample in order to permit the analysis. However, certain metal-cyano complexes are so stable thermodynamically and release complexed cyanide so slowly that even those methods are not very satisfactory. We have investigated an approach to secure the release of cyanide ion in the water sample so that a direct measurement with a selective ion electrode can be used. The proposed technique is based upon the addition of an organic ligand to the sample which will form a metal complex sufficiently stable to release a quantitative amount of cyanide from metal­cyano complexes. We have shown that the complexing agents investigated will release 60-80% of complexed cyanide during simultaneous reflux and irradiation by a mercury lamp. Evidently this represents a state of equilibrium between complexed ligand and cyanide. The complexing agents, therefore, do not form metal complexes sufficiently stable to free enough cyanide ion to permit an analysis for the total cyanide ion concentration.
Issue Date:1979-10
Publisher:University of Illinois at Urbana-Champaign. Water Resources Center
Genre:Report (Grant or Annual)
Sponsor:U.S. Department of the Interior
U.S. Geological Survey
Rights Information:Copyright 1979 held by D.G. Rands R.L. Bain
Date Available in IDEALS:2016-06-29

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