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A Steady‐State Method for Laboratory Measurement of the Oxygen Diffusivity of Porous Materials
Author(s) -
Willey C. R.,
Tanner C. B.
Publication year - 1964
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1964.03615995002800060017x
Subject(s) - thermal diffusivity , oxygen , porosity , diffusion , analytical chemistry (journal) , nitrogen , glass tube , clark electrode , steady state (chemistry) , porous medium , electrode , chemistry , membrane , materials science , thermodynamics , tube (container) , chromatography , composite material , physics , organic chemistry , electrolyte , biochemistry
A steady‐state system using a large membrane‐covered electrode as a quantitative oxygen reducing sink and small membrane‐covered electrodes to measure oxygen concentrations was devised for measuring the oxygen diffusion coefficient D of soil or other porous material artificially packed in a sample‐holding tube. With this system, D was measured both with a zero net nitrogen flux through the sample in a close‐end system and with the counter‐current molar fluxes of oxygen and nitrogen made equal by injecting nitrogen into the system. For 100µ and 300µ diameter glass beads these methods gave values of D that agreed within 3% and were within 8% of values of D measured with a transient method for the same samples. Diffusion coefficients determined for air were in the range of those reported in literature.