Sequential Injection Spectrophotometric Determination of Cyanide

Abstract

A simple and rapid sequential Injection spectrophotometric method for the determination of cyanide is proposed. The method is based on the reaction of cyanide with 2,2-dihydroxy-1,3-indanedione (Ninhydrin), which produces a red colored product that can be monitored at a wavelength of 600 nm. The linear range found is between 2.00 and 7.00 mg l −1 with a detection limit of 0.16 mg l −1 . The sampling rate was calculated to be 45 samples per hour. The proposed method has a precision and accuracy comparable with standard methods.