the reaction of cyanide ion with the disulphides 2,2'-dithiodipyridine , 4,4'-dithiodipyridine , 2,2'-dithiodipyrimidine , and 5,5'-dithiobis ( 2-nitrobenzoic acid ) to displace an absorbing thiol anion has been evaluated for the spectrophotometric determination of cyanide .
C0022023
ion
C0003075
anion