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Title: Development of a high temperature pH electrode for geothermal fluids. Final report, Task III and year end summary

Abstract

This report summarizes work done to demonstrate the applicability of a stabilized zirconia pH sensor to high temperature measurements on brines containing as much as 20 weight percent NaCl and 100 ppM hydrogen sulfide. Throughout the program stable operation was achieved, and measured pH values were in good agreement with calculated values. Differences were generally less than 0.5 pH unit at 285/sup 0/C, and it is not yet certain whether the discrepancies are associated with the measured or calculated values of the pH. While some sensors failed through cracking or because of uperfected seals, no signs of chemical degradation of the ceramic were detected during tests at 285/sup 0/C covering a range of pH between 3 and 9. Two sensors were operated at 285/sup 0/C for periods of 11 days, and one was employed in successive tests for a total of 37 days. At the end of this period the sensor was still satisfactory, and it was forwarded to the sponsoring laboratory, PNL, for further tests. Although most of the work was performed at 285/sup 0/C a limited amount of testing was done at lower temperatures: 95, 150, and 225/sup 0/C. Sensors prepared from in-house tubes and from tubes obtainedmore » from a new supplier performed well at 95/sup 0/C for extended periods, in spite of earlier difficulties with the standard ceramic at this temperature. There is still, however, some uncertainty concerning the adequacy of our seals particularly in cycling between 285/sup 0/C and lower temperatures.« less

Authors:
;
Publication Date:
Research Org.:
General Electric Co., Schenectady, NY (USA). Corporate Research and Development Center
OSTI Identifier:
5057997
Report Number(s):
PNL-4651
ON: DE84010689
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; BRINES; PH VALUE; GEOTHERMAL FLUIDS; CERAMICS; ELECTRODES; FAILURES; HIGH TEMPERATURE; MEASURING INSTRUMENTS; SEALS; ZIRCONIUM OXIDES; CHALCOGENIDES; FLUIDS; OXIDES; OXYGEN COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; Geothermal Legacy; 150903* - Geothermal Engineering- Corrosion, Scaling & Materials Development

Citation Formats

Niedrach, L W, and Stoddard, W H. Development of a high temperature pH electrode for geothermal fluids. Final report, Task III and year end summary. United States: N. p., 1983. Web. doi:10.2172/5057997.
Niedrach, L W, & Stoddard, W H. Development of a high temperature pH electrode for geothermal fluids. Final report, Task III and year end summary. United States. https://doi.org/10.2172/5057997
Niedrach, L W, and Stoddard, W H. 1983. "Development of a high temperature pH electrode for geothermal fluids. Final report, Task III and year end summary". United States. https://doi.org/10.2172/5057997. https://www.osti.gov/servlets/purl/5057997.
@article{osti_5057997,
title = {Development of a high temperature pH electrode for geothermal fluids. Final report, Task III and year end summary},
author = {Niedrach, L W and Stoddard, W H},
abstractNote = {This report summarizes work done to demonstrate the applicability of a stabilized zirconia pH sensor to high temperature measurements on brines containing as much as 20 weight percent NaCl and 100 ppM hydrogen sulfide. Throughout the program stable operation was achieved, and measured pH values were in good agreement with calculated values. Differences were generally less than 0.5 pH unit at 285/sup 0/C, and it is not yet certain whether the discrepancies are associated with the measured or calculated values of the pH. While some sensors failed through cracking or because of uperfected seals, no signs of chemical degradation of the ceramic were detected during tests at 285/sup 0/C covering a range of pH between 3 and 9. Two sensors were operated at 285/sup 0/C for periods of 11 days, and one was employed in successive tests for a total of 37 days. At the end of this period the sensor was still satisfactory, and it was forwarded to the sponsoring laboratory, PNL, for further tests. Although most of the work was performed at 285/sup 0/C a limited amount of testing was done at lower temperatures: 95, 150, and 225/sup 0/C. Sensors prepared from in-house tubes and from tubes obtained from a new supplier performed well at 95/sup 0/C for extended periods, in spite of earlier difficulties with the standard ceramic at this temperature. There is still, however, some uncertainty concerning the adequacy of our seals particularly in cycling between 285/sup 0/C and lower temperatures.},
doi = {10.2172/5057997},
url = {https://www.osti.gov/biblio/5057997}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 01 00:00:00 EST 1983},
month = {Tue Feb 01 00:00:00 EST 1983}
}