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. 2007 Jun 29;1155(1):31-9.
doi: 10.1016/j.chroma.2007.02.083. Epub 2007 Mar 1.

Direct determination of free cyanide in drinking water by ion chromatography with pulsed amperometric detection

Terri T Christison  1 , Jeffrey S Rohrer
Affiliations

Direct determination of free cyanide in drinking water by ion chromatography with pulsed amperometric detection

Terri T Christison et al. J Chromatogr A. .

Abstract

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 microg/L, this method determines cyanide concentrations well below the reporting limits for free cyanide in drinking water.

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