Novel sensor based on Ag/Ag2S electrode for in situ measurement of dissolved H2S in high temperature and pressure fluids

作者：Zhang, R. H.^*; Zhang, X. T.; Hu, S. M.

来源：Sensors and Actuators B: Chemical , 2013, 177: 163-171.

DOI：10.1016/j.snb.2012.10.132

• Ag/Ag2S electrode
• H2S sensor
• Zr/ZrO2 electrode
• In situ measurement
• High temperatures and pressures

This H2S sensor, constructed from an Ag/Ag2S-based sensing element and coupled with a Zr/ZrO2 reference electrode, and YSZ/HgO/Hg electrode, had been tested for its potential response to H2S concentrations in fluids at temperatures from 0 degrees C to 400 degrees C and pressures up to 25 or 33 MPa, and is well suited for determining dissolved H2S concentrations in aqueous media at elevated temperatures from 0 degrees C to 400 degrees C and at high pressures. The Ag/Ag2S electrode is made of an Ag wire with an Ag2S film coating, which can be pressurized and heated at high pressures and temperatures.
The Nernstian response of the Ag/Ag2S-YSZ/HgO/Hg cell potential to H2S concentrations at 400 degrees C and 25 MPa is described as.
Delta E (V) = 0.625 + 0.0667 log m(H2S).
The Nernstian response of the Ag/Ag2S-Zr/ZrO2 potential to H2S at 1 degrees C and 33 MPa is described as:
Delta E (V) = -0.261 - 0.02966 log m(H2S).

• 出版日期2013-2
• 单位中国地质科学院矿产资源研究所