气候变化领域集成服务门户(CCPortal): A Mechanistic Study of Carbonic Anhydrase-Enhanced Calcite Dissolution

CCPortal

DOI	10.1029/2020GL089244
	A Mechanistic Study of Carbonic Anhydrase-Enhanced Calcite Dissolution
	Dong S.; Berelson W.M.; Teng H.H.; Rollins N.E.; Pirbadian S.; El-Naggar M.Y.; Adkins J.F.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:19
英文摘要	Carbonic anhydrase (CA) has been shown to promote calcite dissolution (Liu, 2001, https://doi.org/10.1111/j.1755-6724.2001.tb00531.x; Subhas et al., 2017, https://doi.org/10.1073/pnas.1703604114), and understanding the catalytic mechanism will facilitate our understanding of the oceanic alkalinity cycle. We use atomic force microscopy (AFM) to directly observe calcite dissolution in CA-bearing solution. CA is found to etch the calcite surface only when in extreme proximity (~1 nm) to the mineral. Subsequently, the CA-induced etch pits create step edges that serve as active dissolution sites. The possible catalytic mechanism is through the adsorption of CA on the calcite surface, followed by proton transfer from the CA catalytic center to the calcite surface during CO2 hydration. This study shows that the accessibility of CA to particulate inorganic carbon (PIC) in the ocean is critical in properly estimating oceanic CaCO3 and alkalinity cycles. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atomic force microscopy; Calcite; Calcium carbonate; Catalysis; Dissolution; HTTP; pH; Active dissolution; Calcite dissolution; Calcite surface; Catalytic center; Catalytic mechanisms; Etch pits; Inorganic carbon; Mechanistic studies; Carbonic anhydrase; accessibility; adsorption; alkalinity; atomic force microscopy; calcite; calcium carbonate; carbon dioxide; dissolution; hydration; inorganic carbon
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169625
作者单位	Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States; Division of Geological and Planetary Sciences, Pasadena, CA, United States; Institute of Surface Earth System Science, Tianjin University, Tianjin, China; Department of Physics and Astronomy, University of Southern California, Los Angeles, CA, United States
推荐引用方式 GB/T 7714	Dong S.,Berelson W.M.,Teng H.H.,et al. A Mechanistic Study of Carbonic Anhydrase-Enhanced Calcite Dissolution[J],2020,47(19).
APA	Dong S..,Berelson W.M..,Teng H.H..,Rollins N.E..,Pirbadian S..,...&Adkins J.F..(2020).A Mechanistic Study of Carbonic Anhydrase-Enhanced Calcite Dissolution.Geophysical Research Letters,47(19).
MLA	Dong S.,et al."A Mechanistic Study of Carbonic Anhydrase-Enhanced Calcite Dissolution".Geophysical Research Letters 47.19(2020).