Kd's - Can They Be Used to Describe Reversible Ion Sorption Reactions in Contaminant Migration?

Autor: E. J. Reardon
Rok vydání: 1981
Předmět:
Zdroj: Ground Water. 19:279-286
ISSN: 1745-6584
0017-467X
DOI: 10.1111/j.1745-6584.1981.tb03472.x
Popis: In considering reversible sorption processes in ground-water flow systems, it is important to determine whether the ground water is in steady-state or dynamic chemical evolution. In steady-state chemical evolution, the sorbed site populations at any point along the flow path are in equilibrium with the way in which ground water will evolve chemically due to mineral dissolution/precipitation, redox reactions, etc., during flow when it reaches this point. In dynamic chemical evolution it is not. In the steady-state case, a location in the flow system can be characterized by a constant distribution coefficient over time for an ionic species involved in reversible sorption reactions. In the dynamic case, the distribution coefficient can be expected to vary at a location in a flow system over time. Subsurface contaminant migration problems which confront hydrogeologists invariably are of the dynamic chemical evolution type and the notion of a constant distribution coefficient or Kd to describe reversible sorption processes cannot be entertained.
Databáze: OpenAIRE
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