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Diffusion of ions in sea water and in deep-sea sediments

Authors:	Sandra Gregory

Institution:	Eidgenössische Technische Hochschule (EAWAG) Dübendorf, Switzerland;Woods Hole Oceanographic Institute, Woods Hole, Mass. 02543 U.S.A.

Abstract:	The tracer-diffusion coefficient of ions in water, D_j⁰, and in sea water, $D_{j}^{1}$ , differ by no more than zero to 8 per cent. When sea water diffuses into a dilute solution of water, in order to maintain the electro-neutrality, the average diffusion coefficients of major cations become greater but of major anions smaller than their respective $D_{j}^{1}$ or D_j⁰ values. The tracer diffusion coefficients of ions in deep-sea sediments, D_j,sed., can be related to $D_{j}^{1}$ by $D_{j,sed.} = D_{j}^{1} · α θ^{2}$ , where θ is the tortuosity of the bulk sediment and a a constant close to one.

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