An electrochemical cell for the detection of hydrogen sulfide which includes a gold working electrode and a counter electrode, with or without a reference electrode, comprising either gold or platinum black which operate in a substantially non-aqueous electrolyte consisting preferably of lithium perchlorate...http://www.google.com/patents/US4169779?utm_source=gb-gplus-sharePatent US4169779 - Electrochemical cell for the detection of hydrogen sulfide
