Determination of cyanide ion as its fluorescent derivative by flow injection analysis

Abstract

Trace amounts of cyanide ion in aqueous solution were determined by flow injection analysis as its fluorescent derivative with p-benzoquinone. A small amount of the cyanide solution was injected onto the reaction coil which was set in a thermostat, and then mixed with reagent solution. It was found that 2, 3-dihydrobenzoquinone yielded from cyanide ion had strongly fluorescence at 488 nm. The calibration curve was linear over the concentration from 0.1 to 10 ppm and the relative standard deviation was 2.13 % for 10 runs at 0.1 ppm solution by this method.