Spectrophotometric determination of cyanide with organic disulphides.
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. Reaction is somewhat slow and is applicable to cyanide determination in the range 0.2-5.0 mug ml . By variation of reactant ratios and pH the concentration range can be increased to 50 mug ml . The reaction is faster when cyanide is present at a higher concentration than the disulphide.
Humphrey
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Department of Chemistry, Sam Houston State University, Huntsville, Texas 77340, U.S.A.
Hinze
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