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Experimental studies on the geochemical behaviour of radionuclides and other contaminants in the deep ocean require that the true ambient conditions of this environment are correctly simulated. One of the parameters most often neglected, however, in ocean studies, is that of hydrostatic pressure. This paper describes the apparatus that has been specially developed to enable geochemical investigations to be carried out in the laboratory on sediment-water systems at hydrostatic pressures up to 100 MPa. Two separate high pressure devices have been designed, constructed and set-up in the laboratory; one for conducting static experiments (e.g. diffusion tests) and the other for sediment column migration investigations under conditions of flowing pore waters. Cells currently available for use with this apparatus have been used for conducting diffusion experiments in sediment columns. Results are given concerning calcium carbonate dissolution and diffusion from sediments, which indicate the expected high pressure effect. First results are also given for Tc-95m diffusion. Initial tests are used to make permeability measurements which confirm previous values and demonstrate the feasibility of conducting high pressure migration experiments.

Additional information

Authors: STANNERS D A, JRC Ispra (IT);MURRAY C N, JRC Ispra (IT);PLANSON J, JRC Ispra (IT)
Bibliographic Reference: Article: Marine Geotechnology, Vol. 8 (1989) pp. 181-199
Record Number: 199011123 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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