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Sorption and diffusion of chlorinated methanes in moist clay
Author(s) -
Cabbar H. Canan,
Varol Nesrin,
McCoy Benjamin J.
Publication year - 1998
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690440613
Subject(s) - pellet , chemistry , sorption , adsorption , pellets , diffusion , water vapor , tritiated water , dryness , analytical chemistry (journal) , mineralogy , chromatography , thermodynamics , organic chemistry , materials science , tritium , medicine , physics , surgery , nuclear physics , composite material
The dynamic behavior of chlorinated methanes in clays exposed to relative humidities (RH) from 0 to 80% was investigated with the single‐pellet pulse‐response moment technique. Values of effective diffusion coefficients obtained from zeroth moment analysis differed only slightly for dry and moist clay pellets. When the clay pellet was dry, equilibrium adsorption constants of dichloromethane (D), trichloromethane (T), and carbon tetrachloride (C) at the gas‐mineral interface were determined from first moments to be 118, 92, and 90, respectively. Dryness factors (dry fraction of surface area) for clays with RH of 5, 20, 40, and 60% were also calculated from first moments as 0.5, 0.1, 0.04, and 0.01, respectively. When the pore surfaces were covered with the water film (dryness factor was 0 for the pellet at RH 80%), overall equilibrium adsorption constants for the same tracers (D, T, C) at the gas‐water and water‐mineral interfaces were determined to be 7.5, 7.2, and 3.6, respectively.