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A novel thin layer cell equipped with thin layer gas electrode(TLGE)was studied aselectrochemical gas sensor for the measurement of dissolved oxygen in water or aqueous solutions.The working electrode(TLGE)is a hydrophohic gas diffusing electrode placed between the cellelectrolyte and the solution to be tested.The hydrophobic pores in TLGE serve as a gas chamber.After the sampling period,in which the partial pressure of dissolved oxygen in test solution becomesin equilibrium with that in the gas chamber,the TLGE is polarized with square wave or linear potentialsignal.Then the Faradaic charge (Q) consumed in depletion of the oxygen contained in pores ofTLGE is measured.The main merits of this system are good linearity between the partial pressureof dissolved oxygen in test solution and Q,low zero-reading,negligible liquid-gas difference,con-venient calibration and very low temperature coefficient(ca.0.5%/℃).This technique can also beapplied to the measurement of oxygen partial pressure in gas phases.
A novel thin layer cell equipped with thin layer gas electrode (TLGE) was studied in an electrochemical gas sensor for the measurement of dissolved oxygen in water or aqueous solutions. The working electrode (TLGE) is a hydrophohic gas diffusing electrode placed between the cellelectrolyte and the solution to be tested. The hydrophobic pores in TLGE serve as a gas chamber. After the sampling period, where the partial pressure of dissolved oxygen in test solution becomesin equilibrium with that in the gas chamber, the TLGE is polarized with square wave or linear potentialsignal .Then the Faradaic charge (Q) consumed in depletion of the oxygen contained in pores ofTLGE is measured. The main merits of this system are good linearity between the partial pressure of dissolved oxygen in test solution and Q, low zero-reading, negligible liquid- gas difference, con-venient calibration and very low temperature coefficient (ca.0.5% / ° C). This technique can also be applied to the measurement of oxygen partial pressure e in gas phases.