
TY  - JOUR
A1  - Briot, GT 
A1  - Smith, RH 
T1  - Kinetics of oxidation of thiocyanate by aqueous iodine
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1973
VL  - 26
IS  - 9
SP  - 1863
EP  - 1869
KW  - 
UR  - https://doi.org/10.1071/CH9731863 
N2  - The kinetics of oxidation of thiocyanate to sulphate by aqueous iodine in the pH range 9.2-12.5 have been studied using a spectrophotometric stopped flow technique. The reaction is general base-catalysed, having the rate law                         -d[I2]a/dt = ([SCN-][I3-]/[I-]2)&#931; kB[B]  where [I2]a is the total analytical concentration of iodine, [B] is the concentration of base, and where the summation is taken over all bases present. Rate constants, kB, and activation energies have been measured for the bases, OH-, PO43- and CO32-.     A mechanism involving the initial steps                     I2+SCN- &#8596; ISCN+I-                  (rapid equilibrium)                 ISCN+H2O+B &#8594; HOSCN+I- + HB+            (rate determining)   followed by rapid reactions of HOSCN with itself or with iodine is proposed. 
ER  -

