The speciation equilibrium coupling with phase equilibrium in the H2O-CO2-NaCl system from 0 to 250 degrees C, from 0 to 1000 bar, and from 0 to 5 molality of NaCl
文献类型：期刊论文
| 作者 | Li, Dedong; Duan, Zhenhao |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2007-10-15 |
| 卷号 | 244期号:3-4页码:730-751 |
| 关键词 | CO2 aqueous carbonate system pH speciation equilibrium ionization constant CO2-H2O CO2-H2O-NaCl |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2007.07.023 |
| 文献子类 | Article |
| 英文摘要 | A model is developed for the calculation of the speciation equilibrium of H+, OH-, HCO3-, CO32-, and CO2(aq) in aqueous solutions coupled with liquid-vapor phase equilibrium in the CO2-H2O-NaC1 system from 273 to 523 K, from 0 to 1000 bar (possibly to 2000 bar), and from 0 to 5.0 molality (m) of NaCl. The first and second ionization constants of carbonic acid, pH values in aqueous solutions, and their dependence on temperature (T), pressure (P) and NaCl concentrations can be calculated with accuracy close to those of experiments in the stated T-P-m range. Using the specific ion-interaction equations of Pitzer to calculate activity coefficients, the model is also able to accurately predict the difference between dissociation constants and apparent dissociation constants, and the concentrations of H+, OH-, HCO3-, CO32-, and CO2((aq)) at a given T-P-m condition. Compared to previous models, this model covers larger T-P-m space and much more closely reproduces experimental results, especially in the elevated pressure region. Even without fitting to the experimental data for pH values, dissociation constants and apparent dissociation constants at pressures above the saturation pressures of pure water, this model can accurately predicted these properties up to high pressures. A computer program based on this model is developed and online calculation is made available at: www.geochem-model.org/models.htm. (C)0 2007 Elsevier B.V. All rights reserved. |
| WOS关键词 | PARTIAL MOLAL PROPERTIES ; THERMODYNAMIC IONIZATION-CONSTANTS ; AQUEOUS CARBONATE SOLUTIONS ; SODIUM-CHLORIDE SOLUTIONS ; DISSOCIATION-CONSTANTS ; OSMOTIC COEFFICIENTS ; HIGH-PRESSURES ; MINERAL SOLUBILITIES ; TRANSPORT-PROPERTIES ; NATURAL-WATERS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000250284900024 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/68002]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Duan, Zhenhao |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Dedong,Duan, Zhenhao. The speciation equilibrium coupling with phase equilibrium in the H2O-CO2-NaCl system from 0 to 250 degrees C, from 0 to 1000 bar, and from 0 to 5 molality of NaCl[J]. CHEMICAL GEOLOGY,2007,244(3-4):730-751. |
| APA | Li, Dedong,&Duan, Zhenhao.(2007).The speciation equilibrium coupling with phase equilibrium in the H2O-CO2-NaCl system from 0 to 250 degrees C, from 0 to 1000 bar, and from 0 to 5 molality of NaCl.CHEMICAL GEOLOGY,244(3-4),730-751. |
| MLA | Li, Dedong,et al."The speciation equilibrium coupling with phase equilibrium in the H2O-CO2-NaCl system from 0 to 250 degrees C, from 0 to 1000 bar, and from 0 to 5 molality of NaCl".CHEMICAL GEOLOGY 244.3-4(2007):730-751. |
入库方式： OAI收割
来源：地质与地球物理研究所
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