Analytical Reagent: Determination of Thiocyanate and Cyanide Ions in Metal Complexes and Salts and Thiosemicarbazide Alone and in Its Metal Complexes

As a part of our broad program of introducing new redox titrants in general and aromatic sulfonyl haloamines in particular, to develop rapid and accurate analytical procedures for determining a variety of industrially and biologically important organic and inorganic substances in solution (I, 3-25, 28, 30) we have introduced a new reagent, N,N-dibromobenzenesulfonamide or dibromamine-B (C,H,SO,NBr,, abbreviated as RNBr, or DBB) (22) as an addition to the class of N-haloamines. The haloamines are known to behave as halogenating or oxidizing agents, depending on the pH of the medium and nature of the reductants. Thiocyanates find a number of industrial applications in photography, printing, dyeing textiles, medicine, and freezing mixtures, in the manufacture of synthetic dyestuffs, sulfocyanides, thioureas, and mustard oil, and as reagents in analytical chemistry. The analytical procedures reported so far (3, 6, 8, 24, 28) for determining NCS ion include the use of