DIFFUSION-COEFFICIENTS OF SULFATE AND METHANE IN MARINE-SEDIMENTS - INFLUENCE OF POROSITY

被引：343

作者：

IVERSEN, N ^{[1
]}

JORGENSEN, BB ^{[1
]}

机构：

[1] AARHUS UNIV, DEPT ECOL & GENET, DK-8000 AARHUS, DENMARK

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 1993年 / 57卷 / 03期

关键词：

D O I：

10.1016/0016-7037(93)90368-7

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Tracer diffusion coefficients of sulfate and methane were determined in seawater (D(o)) and in sediments (D(s)). The diffusion coefficients in seawater (20 parts per thousand S) at 4-degrees-C were 0.56 +/- 0.04*10(-5) cm2 s-1 for sulfate and 0.87 +/- 0.10*10(-5) cm2 s-1 for methane. The sediment diffusion coefficients can be related to the diffusion coefficient in free solution by D(s) = D(o)/theta2, where theta is the tortuosity of the sediment. The sediment tortuosity calculated from this equation showed a linear relationship with sediment porosity (phi) over the porosity range of 0.4-0.9. From our data, it was possible to deduce the empirical equation theta2 = 1 + n(1 - phi), which was used to calculate D(s) from D(o):D(s) = D(o)/1 + n(1 - phi), using n = 3 for clay-silt sediments and n = 2 for sandy sediments.

引用

页码：571 / 578

页数：8

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