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Soil Science Society of America Journal Abstract -

Microcalorimeter Adaptation for Measurement of Heats of Adsorption at Solid-Solution Interfaces1


This article in SSSAJ

  1. Vol. 40 No. 4, p. 612-614
    Received: Dec 19, 1975
    Accepted: Feb 24, 1976

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  1. Robert D. Harter and
  2. Brian M. Kilcullen2



The sensitivity of the Calvet Microcalorimeter makes feasible the measurement of very small heats of reaction. This capability is particularly useful when studying adsorption reactions at solid-solution interfaces. The instrument must, however, be specially adapted for measurements of this type, since it contains no provision for equilibration and mixing of separate solutions. Previously developed adaptations of the instrument are not satisfactory, because they either do not stir the combined solutions adequately to overcome flocculation problems or their mechanical energy input is high. An instrument has been developed whereby two solutions can be equilibrated in the calorimeter cell, then mixed and stirred with a net mechanical energy input of −2 ± 0.4 mcalories. This instrument, therefore, makes possible the precise measurement of very small heats of reaction.

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