Terms sourced from: 10.1351/pac199163060895

"Nomenclature, symbols, definitions and measurements for electrified interfaces in aqueous dispersions of solids (Recommendations 1991)", Lyklema, J., Pure and Applied Chemistry 1991, 63(6), 895

indifferent absorbing ion inner Helmholtz plane outer Helmholtz plane point of zero charge potential-determining (p.d.) ions specifically absorbing ion surface ions