Use of Empirically Derived Correction Factors: Polarographic Determination of Free Cyanide in Presence of Sulfides

Indirect Absorptiometric Determination of Cyanide

“…If the materials in which cyanide is determined contain sulfide, it is necessary to consider that sulfide is slowly oxidized by air. Polysulfide formation occurs, which in turn reacts with cyanide to give thiocyanate (2). Experiments demonstrate that, in a solution containing 3 7 of cyanide and 150 7 of sulfide per ml., cyanide is transformed into thiocyanate (Table I).…”

Potentiometric Titrations

“…The presence of bromide, thiocyanate, chlorate, cyanide, and iodide in argentometric determination of chloride was accommodated by oxidation with ceric sulfate and subsequent distillation in the procedure developed by Mahr and Otterbein (96). Free cyanide in the presence of sulfides was determined by Karchmer and Walker (75) by preliminary potentiometric titration of the sulfide with silver nitrate, followed by polarographic determination of cyanide.…”

A Sensitive Colorimetric Reagent for the Determination of Cyanide and Hydrogen Cyanide in Various Environmental Samples

“…1,2 Various instrumental methods have been reported for its determination. [3][4][5] Most common spectrophotometric methods are based on the Konig reaction 6 developed by Aldrige 7 and Epstein. 8 Many of the reagents used for the determination of cyanide like benzidine, 7 p-phenylene diamine, 9 anthranilic acid, 10 phloroglucinol, 11 and p-aminobenzoic acid 12 are less sensitive, and some are carcinogenic as well.…”