Identification of Tetramethylammonium Ion in Methylated NH4-Bentonite

M. A. Franco*, C. Gessa and F. Cariati
* Istituto di Chimica Analitica, Università di Sassari
Istituto di Chimica Agraria, Università di Sassari
Istituto di Chimica lnorganica, Università di Sassari

Abstract: Treating NH4-bentonite with diazomethane results in methylation of adsorbed ammonium with the formation of the tetramethylammonium ion. This ion, which can be completely removed through ion exchange, is distinguished in the IR spectrum by a strong band at 1480 cm−1 due to CH3 group bending vibrations. X-ray diffractograms, CEC, and surface area of the clay are not modified by treatment with diazomethane.

Key Words: Bentonite • Diazomethane • Exchange • Montmorillonite • Tetramethylammonium

Clays and Clay Minerals; February 1978 v. 26; no. 1; p. 73-75; DOI: 10.1346/CCMN.1978.0260109
© 1978, The Clay Minerals Society
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