Indirect determination of cyanide compounds by ion chromatography with conductivity measurement

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00144a015· OSTI ID:6292620

Nonomura, M

Ion chromatography (IC) is a suitable analytical technique for the determination of anions. The cyanide is not detected by the conductivity detector of the ion chromatograph due to its low dissolution constant (pK = 9.2). This paper describes an IC procedure for the determination of free cyanide and metal cyanide complexes that uses a conductivity detector. It is based on the oxidation of cyanide ion by sodium hypochlorite to cyanate ion (pK = 3.66). Therefore, cyanide ion can now be measured indirectly by the conductivity detector. In this procedure, optimum operating conditions were examined. In addition, the interferences from anions and reducing agents were investigated. The method was applied to the determination of metal cyanide complexes. The coefficients of variation (%) for CN/sup -/ (1.05 mg/L), Zn(CN)/sub 4//sup 2 -/ (CN/sup -/, 0.80 mg/L), and Ni(CN)/sub 4//sup 2 -/ (CN/sup -/, 0.96 mg/L) were 1.1%, 1.5%, and 0.5%, respectively. The proposed method proved to be useful for the determination of cyanide compounds in natural water and waste water.

• Research Organization: Tokyo Metropolitan Industrial Technology Center, Japan
• OSTI ID: 6292620
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 59:17; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ANIONS
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMATOGRAPHY
CYANIDES
DATA
EXPERIMENTAL DATA
FRESH WATER
HYDROGEN COMPOUNDS
INFORMATION
ION EXCHANGE CHROMATOGRAPHY
IONS
LIQUID WASTES
NICKEL COMPOUNDS
NUMERICAL DATA
OPTIMIZATION
OXIDATION
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
WASTE WATER
WASTES
WATER
ZINC COMPOUNDS