Dissolution experiments were conducted at pH= 7.2 and dissolution rates of calcite were measured from the spreading of rhombohedral etch pits along both [010] and [42] directions. We also thank Sijia Dong for discussions in general about carbonate dissolution in seawater. Please reconnect. In addition to saturation state and its contribution to free energy, the crystal growth theory of ref. Saturation state was measured by measuring DIC and total alkalinity on seawater before, during, and after every experiment. A 1.4-million-year-old handaxe made from hippopotamus bone expands the known technological repertoire of early human ancestors. FR���RJ�0O'��0�`d�>���#Ӥ��� �� nI*�-$ɬ F�wjiș�%Z�� The transition between these two regimes may be controlled instead by calcite saturation state (i.e., [CO32−]). ��3i�i̤ �y`���y. A novel determination of calcite dissolution kinetics in seawater Adam V. Subhasa,⇑, Nick E. Rollinsb, William M. Berelsonb, Sijia Dongb, Jonathan Erezc, Jess F. Adkinsa aCalifornia Institute of Technology, Pasadena, CA 91125, United States bUniversity of Southern California, Los Angeles, CA 90089, United States cThe Hebrew University, Jerusalem, Israel 9. Thermodynamic modelling of scale (Calcite, Barite, Anhydrite and Gypsum) deposition from brine. 2). A$�Y�'ɜ �eI���� ��`��`6D���"�A��c� � �KD�l��?&����ze�$�կ`��Ad�d �_������9$�1J���$9梋��n���P� Instead of being limited to defects, dissolution is now allowed to proceed everywhere on the mineral surface, which erases the influence of precipitation reactions on the isotopic composition of the solid, and on the time-evolving solution δ13C. Near-equilibrium calcite dissolution in seawater contributes significantly to the regulation of atmospheric CO 2 on 1,000-y timescales. Industrial & Engineering Chemistry Research. Online ISSN 1091-6490. These findings have implications not only for the reactivity differences of calcite between freshwater and seawater but also for how calcite dissolves in natural environments in the presence of increased CO2 and carbonic anhydrase. For dissolution rate measurements, we followed the methods detailed in ref. Furthermore, the addition of CA, although it increases the dissolution rate of calcite, does not produce a linear response of dissolution rate to saturation state. Dissolution rates calculated in this way were plotted against calculated saturation state and carbonic anhydrase concentration. Amy T. Kan, Joey Zhaoyi Dai, Guannan Deng, Gedeng Ruan, Wei Li, Khadouja Harouaka, Yi-Tsung Lu, Xin Wang, Yue Zhao, Mason B. Tomson. We acknowledge Alex Gagnon for helpful discussions on the formulation of the box model, and Yunbin Guan for help with SIMS analysis. The shape of the transverse cross sections of the calcite microneedles obtained in the presence of NH 4 Cl and NH 4 Ac is almost regularly triangular. More details can be found in SI Appendix. We do not capture any email address. Linear fits to the data in this framework are presented in Table 1, along with an estimate of the interfacial surface energy α. ��:H U"m�!5�3ad�)�EZ��p�%��@�%0�#O�+�(VV"Q�� This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1703604114/-/DCSupplemental. Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. General Overview 348 3.2. 2 versus |1/σ| in Fig. These solutions were added to the dissolution experiments to bring the total [CA] in each experiment to 0, 0.01, 0.02, or 0.04 mg/mL. Thorsten Hörbrand, Thomas Baumann, Helge C. Moog. Parisa Doubra, Arash Kamran-Pirzaman, Amir H Mohammadi, Rasoul Hassanalizadeh.

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