ELECTROCHEMICAL CELL FOR ANALYSING SULPHUR-CONTAINING GASES Russian patent published in 2015 - IPC G01N27/417 

FIELD: chemistry.

SUBSTANCE: apparatus is designed for qualitative and quantitative determination of sulphur-containing gases (hydrogen sulphide and sulphur dioxide) in exhaust gases of chemical plants, thermal power plants, for analysing light- and dark-oil products and can be used to determine maximum allowable concentration of sulphur-containing gases in chemical, petrochemical, medical and food industries. An electrochemical cell for analysing sulphur-containing gases includes a pipe made of quartz glass having inside it gas inlet and outlet nozzles, graphite and nichrome current-conductors, a graphite electrode, a sulphide-conducting membrane, a comparison electrode placed in the graphite conductor and made of bismuth sulphide with an additive of bismuth metal powder, and a working electrode. According to the invention, the sulphide-conducting membrane of the electrochemical cell is a solid electrolyte (CaY₂S_4-x mol % Yb₂S₃) with the following ratio, mol %: calcium thioittrate (CaY₂S₄) - 84-100%, sesquialteral ytterbium sulphide (Yb₂S₃) - the balance.

EFFECT: reducing the lower threshold of the determined concentration of hydrogen sulphide and sulphur dioxide, high sensitivity and low operating temperature of the sensitive element.

3 dwg, 1 tbl