title: Spectrophotometric determination of aqueous cyanide using a revised phenolphthalin method.
abstract: This paper focuses on a revision of the phenolphthalin method for cyanide analysis, with the intent of producing a robust and sensitive spectrophotometric method. Limitations of the phenolphthalin chemistry were overcome by the addition of EDTA to the reagent. The revised reagent was found to have suitably fast kinetics, a linear dynamic range of 0.01-3.0 ppm cyanide, and a detection limit of 5 ppb. The method was tested for interferences and applied to the determination of cyanide in environmental waters.
authors.affiliation: Department of Chemistry and Physics, University of North Florida, Jacksonville, FL 32224, USA.
authors.forename: David
authors.initials: D
authors.lastname: Cacace
authors.forename: Heidi
authors.initials: H
authors.lastname: Ashbaugh
authors.forename: Naomi
authors.initials: N
authors.lastname: Kouri
authors.forename: Sara
authors.initials: S
authors.lastname: Bledsoe
authors.forename: Sean
authors.initials: S
authors.lastname: Lancaster
authors.forename: Stuart
authors.initials: S
authors.lastname: Chalk