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The Early Stages of Mimetite Dissolution in EDTA Studied with Atomic Force Microscopy and Scanning Electron Microscopy

Part of: Micrographia Collection

Published online by Cambridge University Press:  13 March 2019

Tomasz Bajda ,
Maciej Manecki  and
Marek Matyjasik
Tomasz Bajda*
Affiliation:
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, al. Mickiewicza 30, 30–059 Krakow, Poland
Maciej Manecki
Affiliation:
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, al. Mickiewicza 30, 30–059 Krakow, Poland
Marek Matyjasik
Affiliation:
Department of Geosciences, Weber State University, 2507 University Circle, Ogden, UT 84408, USA
*
*Author for correspondence: Tomasz Bajda, E-mail: bajda@agh.edu.pl
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Abstract

A mineral, mimetite Pb5(AsO4)3Cl, is one of the most insoluble minerals and continues to be considered a viable remedial strategy for immobilization of Pb and As from contaminated soils. It has been recognized that many well-known, naturally-occurring, and synthetic chelators strongly influence dissolution processes in near-surface geological environments. In this study, crystals of mimetite were observed in scanning electron microscopy (SEM) and atomic force microscopy (AFM) before and after dissolution in EDTA (ethylene diamine tetra-acetic acid) solution. Direct in situ observations at room temperature made in an AFM fluid cell revealed that the grain surface roughness has increased due to development of etch pits. Both hexagonal and prismatic walls developed dissolution features between 0.6 and 1.2 µm, respectively, during duration of the experiment. AFM observations suggest surface-controlled dissolution dominated step retrieval on both prismatic and hexagonal surfaces. SEM observations showed the development of rounded edges on hexagonal walls and elongated, oval etch pits on the prismatic wall. These results, representing early dissolution patterns on mimetite surfaces, might suggest that low pH conditions in soils containing organic acids similar to EDTA might contribute to remobilization of Pb and As from mimetite when applied to stabilization of these toxic metals in contaminated soils.

Keywords

AFMapatiteetch pitsnucleationSEM
Type
Micrographia
Information
Microscopy and Microanalysis , Volume 25 , Issue 3 , June 2019 , pp. 810 - 816
Copyright
Copyright © Microscopy Society of America 2019 

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