期刊
GEOCHIMICA ET COSMOCHIMICA ACTA
卷 73, 期 11, 页码 3201-3217出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.gca.2009.03.016
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资金
- European Commission [SSP1-CT-2003-501571]
- Spanish government [MAT2006-00578]
- Junta de Andalucia, Spain [NRM-179]
- Deutsche Forschungsgememschaft (DFG)
In situ Atomic Force Microscopy, AFM, experiments have been carried Out using calcite cleavage surfaces in contact with solutions of MgSO4, MgCl2, Na2SO4 and NaCl in order to attempt to understand the role of Mg2+ during calcite dissolution. Although previous work has indicated that magnesium inhibits calcite dissolution, quantitative AFM analyses show that despite the fact that Mg2+ inhibits etch pit spreading, it increases the density and depth of etch pits nucleated oil calcite surfaces and, subsequently, the overall dissolution rates: i.e., froin 10(-11.75) mol cm(-2) s(-1) (in deionized water) up to 10(-10.54) mol cm(-2) s(-1) (in 2.8 M MgSO4). Such an effect is concentration-clepenclent and it is most evident in concentrated solutions ([Mg2+] >> 50 mM). These results show that common soluble salts (especially Mg sulfates) may play it critical role in the chemical weathering of carbonate rocks in nature its well as in the decay of carbonate stone in buildings and statuary. (C) 2009 Elsevier Ltd. All rights reserved.
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