Surface mounted pH sensor for cone penetration testing

Details Surface mounted pH sensor for cone penetration testing Surface mounted pH sensor for cone penetration testing

1994-09-01

1996-03-05

Wieder, Kenneth A.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324438, 324449, 174 7, 204288, 204289, G01N 3322, G01N 3324

Patent

active

054970911

ABSTRACT:
A surface-mounted pH sensor provides continuous pH profiling with depth during standard cone penetration testing (CPT). The pH sensor includes at least two electrodes, one being an antimony electrode and the other being a ceramic electrode. The electrodes are mounted to the shaft of a cone penetration device, and make contact with underground fluids during CPT. The antimony electrode, which functions as a measurement electrode, creates an exchange equilibrium between the hydrogen ions in the underground fluids and the ions of the antimony. This equilibrium creates a potential in the antimony electrode which is measured against the stable reference potential of the ceramic electrode. The resulting potential difference is indicative of the pH level of the underground fluids.

REFERENCES:
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Designation: D 3441-86, "Standard Test Method for Deep, Quasi-Static, Cone and Friction-Cone Penetration Tests of Soil.sup.1 " pp. 469-474 (1986).

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