Kinetics and Energetics of Adsorption and Desorption of Mineral Nutrients From Soil Minerals. Period Covered: June 1, 1969--February 28, 1970. Page: 4 of 18
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In principle, obtaining kinetic data of ion adsorption by mineral
surfaces is simple. The procedure is to determine how the ion concen-
tration in solution varies with time in the presence of a given amount
of solid, holding the temperature of the system constant. However,
usually the solid phase must be separated from the aqueous phase before
the ion concentration is determined. This is usually done by removing
the sample from the thermostat (water bath) centrifuging it in a tempera-
ture-controlled high speed centrifuge (tiWC) and analyzing the supernatat
liquid. Because of the time involved and the lack of precision tempera-
tire control using the high speed centrifuge, accurate kinetic data,
involving short resctivn tim ws, are precluded,
The past year was dedicated to a study of experiment-al techniques
which would allow elimination of the centrifuge in adsorptiou kinetic
studies. The feasibility of using a dialysis membrane bag to separate
the solid from the aqueous solution was investigated. The membrane allows
the free diffusion of ions in solution but restrains the solid phase
with the bag. The aqueous solution can then be readily pipetted from a
reaction flask and analyzed without removing the reaction flask from
the water bath.
The presence of the solid in a dialysis bag divides the total ion
(adsorbate) concentration into 3 distinct regions: 2) the solution out-
side the dialysis bag, b) the solution within the dialysis bag, c) the
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Smith, R. L. Kinetics and Energetics of Adsorption and Desorption of Mineral Nutrients From Soil Minerals. Period Covered: June 1, 1969--February 28, 1970., report, January 1, 1970; United States. (digital.library.unt.edu/ark:/67531/metadc864961/m1/4/: accessed March 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.