Pulse radiolysis study of monovalent cadmium, cobalt, nickel and zinc in aqueous solution. Part 2.—Reactions of the monovalent ions

Abstract

Reactions of the monovalent metal ions Cd⁺, Co⁺, Ni⁺ and Zn⁺ with electron acceptors in neutral aqueous solution have been studied and three types identified: (a) addition M⁺+ O₂→ MO⁺₂(M = Ni) M⁺+ olefin →(M—olefin)⁺(b) oxygen atom transfer M⁺+ N₂O → MO⁺+ N₂(c) electron transfer M⁺+ S₂O^2–₈→ M²⁺+ SO^–₄+ SO^2–₄. In reaction (b) when M= Co, long lived Co^III species are produced.

Evidence is also presented for the oxidation of Co²⁺ by OH (k= 8 × 10⁵ dm³ mol^–1 s^–1) and by SO^–₄(k∼ 2 × 10⁶ dm³ mol^–1 s^–1) in neutral solution.