A titration apparatus comprising a titration reservoir for a non-flowing sample solution to be titrated; an ion source reservoir comprising an ion source solution of selected ions; an ion exchange membrane barrier capable of passing ions from the ion source solution to the titration reservoir, but of blocking bulk liquid flow; a first electrode in electrical communication with the ion source reservoir; and a second electrode in electrical communication with the titration reservoir. Also, an electrolytic titrant generator for use in the titration apparatus.