Photodissociation/gas diffusion/ion chromatography system for determination of total and labile cyanide in waters
- Dionex Corporation, Sunnyvale, CA (USA)
An automated system for determination of total and labile cyanide in water samples has been developed. The stable metal-cyanide complexes such as Fe(CN){sub 6}{sup 3{minus}} are photodissociated in an acidic medium with an on-line pyrex glass reaction coil irradiated by an intense Hg lamp. The released cyanide (HCN) is separated from most interferences in the sample matrix and is collected in a dilute NaOH solution by gas diffusion using a hydrophobic porous membrane separator. The cyanide ion is then separated from remaining interferences such as sulfide by ion exchange chromatography and is detected by an amperometric detector. The characteristics of the automated system were studied with solutions of free cyanide and metal-cyanide complexes. The results of cyanide determination for a number of wastewater samples obtained with the new method were compared with those obtained with the standard method. The sample throughput of the system is eight samples per hour and the detection limit for total cyanide is 0.1 {mu}g/L.
- OSTI ID:
- 6150575
- Journal Information:
- Analytical Chemistry (Washington); (USA), Vol. 62:7; ISSN 0003-2700
- Country of Publication:
- United States
- Language:
- English
Similar Records
Indirect determination of cyanide compounds by ion chromatography with conductivity measurement
Photodissociation of vinyl cyanide at 193 nm: Nascent product distributions of the molecular elimination channels
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CYANIDES
QUANTITATIVE CHEMICAL ANALYSIS
AUTOMATION
ION EXCHANGE CHROMATOGRAPHY
MEASURING INSTRUMENTS
MEASURING METHODS
WASTE WATER
WATER
CHEMICAL ANALYSIS
CHROMATOGRAPHY
HYDROGEN COMPOUNDS
LIQUID WASTES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
WASTES
400102* - Chemical & Spectral Procedures