PMID: 15224733Jul 1, 2004Paper

Effects of the biologically produced polymer alginic acid on macroscopic and microscopic calcite dissolution rates

Environmental Science & Technology
Thomas D PerryRalph Mitchell

Abstract

Dissolution of carbonate minerals has significant environmental effects. Microorganisms affect carbonate dissolution rates by producing extracellular metabolites, including complex polysaccharides such as alginic acid. Using a combined atomic force microscopy (AFM)/flowthrough reactor apparatus, we investigated the effects of alginic acid on calcite dissolution. Macroscopic dissolution rates, derived from the aqueous metal ion concentrations, are 10(-5.5) mol m(-2) s(-1) for 5 < pH < 12 in the absence of alginic acid compared to 10(-4.8) mol m(-2) s(-1) in its presence. The AFM images demonstrate that alginic acid preferentially attacks the obtuse steps of dissolution pits on the calcite surface. In pure water, the obtuse and acute steps retreat at similar rates, and the pits are nearly isotropic except under highly acidic conditions. In alginic acid, the acute step retreat rate is nearly unchanged in comparison to water, whereas the obtuse step retreat rate increases with decreasing pH values. As a result, the pits remain rhombohedral but propagate faster in the obtuse direction. To explain these observations, we propose that alginic acid preferentially forms dissolution active surface complexes with calcium atoms on the obtus...Continue Reading

References

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Citations

Jan 5, 2006·Microbial Ecology·Christopher J McNamaraRalph Mitchell
May 10, 2011·The Science of the Total Environment·Gabrielle ZammitPatrizia Albertano
Dec 23, 2006·Journal of Applied Microbiology·B O Ortega-MoralesJ Guezennec
Oct 19, 2016·Ground Water·Abdullah H A DehwahThomas M Missimer
Oct 22, 2016·Environmental Science & Technology·Ke YuanPaul Fenter
Apr 21, 2005·Journal of the American Chemical Society·Thomas D PerryRalph Mitchell
Aug 20, 2020·Journal of Colloid and Interface Science·Kathryn Louise BrowningStuart Matthew Clarke
Nov 26, 2020·ACS Applied Materials & Interfaces·Ricardo D SosaJeffrey D Rimer
Apr 12, 2008·Micron : the International Research and Review Journal for Microscopy·Hermann EhrlichOleg S Pokrovsky
Dec 6, 2005·Environmental Science & Technology·Thomas D PerryRalph Mitchell

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