The Liquid Junction Potential on the Diaphragm of Reference ElectrodesThe electrolyte solution flow through porous ceramic diaphragms is used for evaluating measurements of streaming potentials. With porous magnesia silicate diaphragms, by salt concentrations from 1 × 10−5to 1 M KCl, the values of zeta potentials are negative. Increases in salt concentrations lower the zeta potentials through a decrease in double layer thickness. In presence of concentrated salt solutions the streaming potential has a very small effect on liquid junction potential of reference electrod