[en] A fundamental study was conducted to analyze the mechanism of decontamination, as a part of the efforts to develop regenerative LOMI decontamination process. Most of the chemical reactions between picolinate and metal ions such as V, Fe, Ni and Co in the LOMI decontamination system have been known fast chelation reactions so that the chemical reactions can be represented with thermodynamic equilibrium. The chemical species in the LOMI decontamination system above pH 5 has not been well investigated. Reduction mechanism of the V(III) - picolinic acid system based on the results obtained from cyclic voltammetry with various scan rates was investigated. (author). 7 refs, 5 figs