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Diffusion coefficients of nitrate, chloride, sulphate and water in cracked and uncracked Chalk
Author(s) -
HILL D.
Publication year - 1984
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1984.tb00256.x
Subject(s) - chloride , diffusion , nitrate , chemistry , hydrostatic pressure , tritiated water , tracer , mineralogy , analytical chemistry (journal) , thermodynamics , chromatography , tritium , physics , organic chemistry , nuclear physics
SUMMARY The rates of diffusion of chloride, sulphate and water, labelled respectively with 36 Cl, 35 S and 3 H, and unlabelled nitrate, were measured in small cylindrical Chalk monoliths. Using a simple mathematical model, diffusion coefficients were calculated to provide a basis for comparing the movement of these substances through Chalk rock in the absence of hydrostatic pressure gradients. The diffusion coefficients of chloride and nitrate were similar, with a range of values (0.52–3.23 × 10 −6 cm 2 s −1 ) and (0.53–3.20 × 10 −6 cm 2 s −1 ) respectively. These were slightly less than for tritiated water (0.60–3.51 × 10 −6 cm 2 s −1 ), while the coefficient for sulphate was about half that of the others (0.28–1.47 × 10 −6 cm 2 s −1 ). The coefficients indicate the absence of any interaction with the Chalk surfaces.