There are other techniques involving pumping with nitrogen. This requires you to seal the sample longitudinally, I believe this should be along the general flow direction. there wll be sealed in parts of the pore volume but you get the effective pore volume. Pumping nitrogen in one side and collecting water or everything, then remember to account for N2 and the pore volume it displaced. Nitrogen is small enough to displace pretty much everything, and can be modeled using something akin to the Buckley -Leverett Solution. This will destroy your sample in a way, since it's difficult to displace the nitrogen. Vacuum techniques are one way to get close to removing it. Other considerations are anisotropic conditions, although shallow sample wells will allow you to characterize that. A Petroleum Engineering professor, Dr Jafarpour at USC is working on characterizing subsurface conditions with limited data, but I've not worked with him so I don't know it well.If you only wish to chemically characterize your pore water then displace it with other water and model the diffusing effects. This is relatively simple to model, using the error function, to determine the mixing of your components and your input water.
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