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An in-situ calibration method to accurately and precisely constrain the pH of deep sea environments is reported. This method involves the pre-evaluation of the Ir-IrOx|Ag-AgCl electrode in the laboratory, followed by the in situ calibration using pH buffers at the ocean bottom. The standard potential E° and in situ slope are derived by the calibration process. This calibration method was implemented...
An in-situ chemical sensor system was developed for long term monitoring of hydrothermal vent fluids as part of the US NSF Ocean Observatory Initiative (OOI) Regional Scale Nodes (RSN) in the Northeast Pacific Ocean. The sensor wand design is based on Yittria-stabilized zirconia (YSZ) ceramic membrane electrode in conjunction with Ag|AgCl reference electrode, Au or Pt redox electrode and Ag|Ag2S (H2S)...
A recently developed in situ pH measurement and calibration system (pH Calibrator) has been deployed on MARS (Monterey Accelerated Research System) cabled ocean observatory located at Monterey Bay, California. The deployment took place at the depth 880 m, and lasted for more than two months. A key aspect of the instrument is user-defined auto-calibration, enhancing the accuracy of pH measurements...
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