| http://www.w3.org/ns/prov#value | - A conventional approach to measuring oxygen concentration has been to place two electrodes 1, 2 (as seen in FIG. 1), one a working electrode (the cathode, for example of gold, platinum or other noble metal or carbon) and the other a reference electrode (the anode, for example of silver, silver-silver chloride or other material), in an electrolyte 3 having the species, the concentration of which is
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