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The Role of Hydrolysis in the Reaction of Heavy Metals with Soil‐Forming Materials
Author(s) -
Hodgson J. F.,
Tiller K. G.,
Fellows Martha
Publication year - 1964
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1964.03615995002800010026x
Subject(s) - hydrolysis , chemistry , adsorption , metal , montmorillonite , metal ions in aqueous solution , ionic strength , inorganic chemistry , ionic bonding , ion , ion exchange , organic chemistry , aqueous solution
The proposition that hydrolysis may account for the selective adsorption of heavy metals by clay surfaces is compared with an alternate explanation of specific exchange of the metal with weakly dissociable H + . It is shown that past evidence offered in support of the two hypotheses is somewhat ambiguous. Theoretical treatment is presented for the competition of ions in adsorption reactions which provides a means of distinguishing between the two alternatives through the effect of H + on the metal‐clay reaction in the presence of a competing ion. Experimentally, the effect of H + on the reaction of Co 2+ with montmorillonite is studied in the presence and absence of Mg 2+ , a weakly competing ion. Ionic strength is held constant, and nonspecific reactions are minimized with an excess of CaCl 2 . The results are interpreted as favoring the hydrolysis hypothesis. Inherent assumptions are considered.