THE KINETICS OF THE CHLORATE-BISULFITE AND CHLORATE-SULFITE/BISULFITE REACTION SYSTEMS

摘要

The kinetics of the reactions of ClO_3~- with HSO_3~- and H2SO3 was studied by measuring the concentration of [Cl~-] and [H~+] both in chlorate-bisulfite and chlorate-sulfite/bisulfite solutions. A reaction mechanism was applied for simulation of the experimental observations. Rate constants k1 = (1±0.5)·10~(-4)M~(-1) s~(-1) and k2= (0.23±0.01) M~(-1) s~(-1) were determined for the following reactions: ClO_3~- +3HSO_3~-→Cr + 3SO_4~(2-)+3H~+ (1) ClO_3~- + 3H2SO3 →Cl~- + 3 SO_4~(2-) + 6H~+(2) Rate constant k1 was obtained directly from the experimental results of chlorate-sulfite/bisulfite reactions, where reaction (1) is predominant. Rate constant k2 was obtained by computer fitting of [Cl~-] and [H~+] to the experimental values both in chlorate-bisulfite and chlorate-sulfite/bisulfite reactions.