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01359 FLOW-THROUGH YITTRIA STABILIZED PH SENSING ELECTRODE FOR CHEMISTRY MONITORING IN SCWO ENVIRONMENTS

Picture for 01359 FLOW-THROUGH YITTRIA STABILIZED PH SENSING
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Product Number: 51300-01359-SG
ISBN: 01359 2001 CP
Author: H.L. Barnes, X.Y. Zhou, S.M. Ulyanov, and S.N. Lvov
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A recently developed flow-through, yittria-stabilized zirconia (YSZ) pH sensor is presented. The Nernstian behavior and precision of the YSZ sensor was evaluated by comparing the potentials between the YSZ sensor and a Pt(H2) electrode. The results shows that this design is viable for pH measurements to an accuracy of about +-0.05 pH units, or about a factor of 2-10 better than it is normally achieved at temperatures above 300°C. A by-pass electrochemical system for on-line pH monitoring in industrial systems was designed. The system allows to in situ calibrate the pH sensors using the reference solutions and provide real-time monitoring of the pH of industrial hydrothermal fluids.
A recently developed flow-through, yittria-stabilized zirconia (YSZ) pH sensor is presented. The Nernstian behavior and precision of the YSZ sensor was evaluated by comparing the potentials between the YSZ sensor and a Pt(H2) electrode. The results shows that this design is viable for pH measurements to an accuracy of about +-0.05 pH units, or about a factor of 2-10 better than it is normally achieved at temperatures above 300°C. A by-pass electrochemical system for on-line pH monitoring in industrial systems was designed. The system allows to in situ calibrate the pH sensors using the reference solutions and provide real-time monitoring of the pH of industrial hydrothermal fluids.
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