1. Theo- andm-isomers accelerate this reaction in all investigated solutions. The standard rate constants are similar at the same degree of electrode coverage with these isomers in water and mixed solutions.p-Aminobenzoic acid inhibits the process of Zn(II)/Zn(Hg) electroreduction.

Dieo- undm-Isomeren beschleunigen die Reaktion, und die Reaktionsgeschwindigkeiten sind in Wasser und in Methanol-Wasser gleich.