Premium
The Role of Aluminum in the Titration of Bentonite
Author(s) -
Low Philip F.
Publication year - 1955
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/sssaj1955.03615995001900020006x
Subject(s) - bentonite , potentiometric titration , titration , conductometry , chemistry , aluminium , inorganic chemistry , titration curve , geology , ion , organic chemistry , paleontology
An hypothesis was proposed that the initial inflection point or break in the potentiometric and conductometric titration curves of bentonite is due to exchangeable aluminum displaced from the crystal lattice by hydrogen. This hypothesis was tested by saturating samples of bentonite with silver and then displacing the silver with known amounts of hydrogen and aluminum added as the chlorides. Titration of the resulting H‐A1 bentonites with NaOH confirmed the hypothesis. Extraction of H‐Al bentonites with BaCl 2 indicated that the amount of replaceable aluminum was limited. It was pointed out that potentiometric and conductometric titrations can be used to determine the amount of aluminum on an acid bentonite.