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Stripping voltammograms of perchlorate at a PVC/POT-modified pencil lead (see inset for its image). Aqueous and organic supporting electrolytes are Li2SO4 and tetradodecylammonium tetrakis(pentafluorophenyl)borate, respectively. Scan rate, 0.1 V/s. Adapted with permission from ref. [144]. Copyright 2012 American Chemical Society.
