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Enhancement of dissolution rates of amorphous silica by interaction with amino acids in solution at pH 4

Published online by Cambridge University Press:  01 January 2024

Motoharu Kawano*
Affiliation:
Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan
Tamao Hatta
Affiliation:
Japan International Research Center for Agricultural Sciences, 1-1 Ohwashi, Tsukuba, Ibaraki 305-8686, Japan
Jinyeon Hwang
Affiliation:
Division of Earth Environmental System, Pusan National University, Busan 609-735, Korea
*
* E-mail address of corresponding author: kawano@sci.kagoshima-u.ac.jp

Abstract

Amino acids are present in various geochemical environments and they interact with mineral surfaces. To evaluate the effects of amino acids on mineral dissolution at pH conditions less than their isoelectric points (pI), dissolution experiments of X-ray amorphous silica in solutions containing 10.0 mmol/L of various amino acids (cysteine, asparagine, serine, tryptophan, alanine, threonine, histidine, lysine, and arginine) at pH 4 were performed. The results confirmed that basic amino acids (histidine, lysine, and arginine) produce an 8- to 8.5-fold enhancement of the rate of dissolution of amorphous silica compared with an amino acid-free control. Neutral amino acids (cysteine, asparagine, serine, tryptophan, alanine, and threonine) enhanced rates of dissolution by a factor of ∼3 to 3.5. The rate-enhancement effects of amino acids are controlled by concentrations of the amino acid’s cationic species which interact with the negatively charged >SiO sites at the surface of the amorphous silica.

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Article
Copyright
Copyright © The Clay Minerals Society 2009

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