Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1155, Issue 1, Pages 31-39Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2007.02.083
Keywords
cvanide : PAD; pulsed amperometric detection; IC-PAD; silver electrode; ion chromatography
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Cyanide is a regulated contaminant in drinking water in the United States. This paper describes an ion chromatography method with pulsed amperometric detection (PAD) that directly determines free cyanide in drinking water. Samples are treated with sodium hydroxide to stabilize cyanide and with a cation-exchange cartridge to remove transition metals. Cyanide is separated by anion-exchange chromatography and detected by PAD with a waveform. optimized for cyanide and used with a disposable silver working electrode. The recovery of cyanide spiked into five water samples was > 80%. With an MDL of 1.0 mu g/L, this method determines cyanide concentrations well below the reporting limits for free cyanide in drinking water. (c) 2007 Elsevier B.V. All rights reserved.
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