(under subclass 400) Apparatus in which a constituent of the fluid being treated diffuses through a material which acts as a barrier to other constituents of the fluid permitting only the selected constituent to contract the electrode surface.
SEE OR SEARCH THIS CLASS, SUBCLASS:
416+, for electrodes which are themselves selective as to ionic species.
SEE OR SEARCH CLASS
210, Liquid Purification or Separation,
644, for processes of use of selectively permeable membranes.
