高温高压下KCl水溶液中离子示踪扩散系数的确定

苏根利; 谢鸿森; 丁东业; 郭捷; 孙樯

doi:10.11858/gywlxb.2000.04.007

高温高压下KCl水溶液中离子示踪扩散系数的确定

doi: 10.11858/gywlxb.2000.04.007

中国科学院地球化学研究所，贵州贵阳 550002

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通讯作者:
苏根利

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出版历程
- 收稿日期: 2000-03-27
- 修回日期: 2000-06-12
- 发布日期: 2000-12-05

Experimental Determination of Diffusion Coefficients of Ions in Aqueous Fluids at Elevated Temperatures and Pressures

Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

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Corresponding author: SU Gen-Li

摘要

摘要: 离子的扩散系数是定量模拟地球内部质量扩散作用所需要的一个重要参数。在100～500 ℃、0.1～1.2 GPa下实验测量了0.01 mol/L KCl溶液的电导率，获得了KCl的极限摩尔电导率，并利用Nernst-Einstein方程计算出了溶液中K+、Cl-的示踪扩散系数。离子的示踪扩散系数随温度升高而增大，随压力降低而减小。结合扩散作用地球化学模型可以定量分析离子种类在许多地球化学过程中的扩散质量迁移和热液体系中热液蚀变带的演化，对高温高压下水岩相互作用的研究具有重要意义。
- KCl溶液 /
- 极限摩尔电导率 /
- 示踪扩散系数
Abstract: Diffusion coefficients of ions in aqueous fluids are used to predict mass transfer in many geochemical processes quantitatively. The limited molar conductivities of dilute aqueous potassium chloride solutions were determined by electrical conductance measurements from 100 to 500 ℃ and pressure up to 1 200 MPa. Tracer diffusion coefficients were calculated from the limited molar conductivities of ions using Nernst-Einstein equation. The tracer diffusion coefficients increase with temperature and decrease slightly with increasing pressure.
- potassium chloride solution /
- electrical conduc tivities /
- tracer diffusion coefficient

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参考文献(21)

Wendt R P. The Estimation of Diffusion Coefficients for Ternary System of Strong and Weak Electrolytes [J]. J Phys Chem, 1965, 69: 1227-1237.

Miller D G. Application of Irreversible Thermodynamics to Electrolyte Solutions: II. Ionic Coefficients lij for Isothermal Vector Transport Processes in Ternary System [J]. J Phys Chem, 1967, 71: 612-632.

Robinson R A, Stokers R H. Electrolyte Solutions. 2nd ed [M]. Berlin: Butterworths, 1968: 559.

Lasaga A C. The Treatment of Multi-Component Diffusion and Ion Paris in Diagenetic Fluxes [J]. Am J Sci, 1979, 279: 324-346.

Graf D L, Anderson D E, Woodhouse J B. Ionic Diffusion in Naturally-Occuring Aqueous Solution: Transition-State Models that Use Either Empirical Expressions or Statistically-Derived Relationships to Predict Mutual Diffusion Coefficient in the Concentrated-Solution Region of 8 Binary Systems [J]. Geochim Cosmochim Acta, 1983, 47: 1985-1998.

[6 ] Oelkers E H, Helgenson H C. Calculation of the Thermodynamic and Transport Properties of Aqueous Species at High Pressures and Temperatures: Aqueous Tracer Diffusion Coefficients of Ions to 1000 ℃: and 5 kbar [J]. Geochim Cosmochim Acta, 1988, 52: 63-85.

谭凯旋, 张哲儒, 王中刚. 热液流体中的离子扩散作用: I. 示踪扩散系数的理论计算 [J]. 矿物学报, 1995, 2: 123-131.

Atkins P W. Physical Chemistry. 4th ed [M]. Oxford: Oxford University Press, 1990.

Helgenson H C, Kirkham D H. Theoretical Prediction of the Thermodynamic Behavior of Aqueous Electrolytes at High Pressures and Temperatures:Ⅲ. Equation of State for Aqueous Species at Infinite Dilution [J]. Am J Sci, 1976, 276: 97-240.

安特罗波夫L I. 理论电化学 [M]. 吴中达, 朱耀武译. 北京: 髙等教育出版社, 1981.

谢鸿森. 地球深部物质科学导论 [M]. 北京: 科学出版社, 1997.

徐有生, 谢鸿森, 郭捷, 等. 0.4?5.0 GPa和室温?500 ℃下NaCl溶液的电导率 [J]. 中国科学(D辑), 1997, 2: 133-136.

郑海飞, 谢鸿森, 徐有生, 等. 0.21?4.18 GPa和20?350 ℃下H2O的电导率研究 [J]. 科学通报, 1997, 9: 897-902.

田昭武. 电化学研究方法 [M]. 北京: 科学出版社, 1984.

Quist A V, Marshall W L. Electrical Conductances of Aqueous Sodium Chloride Solutions from 0 to 800 ℃ and at Pressures to 4000 bars [J]. J Phys Chem, 1968, 72(2): 684-703.

Sirota A M, Shviriaev Y V. The Electrical Conductivity of Water and Dilute Aqueous Solutions on Saturation Curve [A]. Barnes H L. High Temperature High Pressure Electrochemistry in Aqueous Solutions [C]. London: Univ of Survey, 1973: 169-176.

Burnham C W, Holloway J R, Davis N F. The Specific Volume of Water in the Range 1000 to 8900 bars, 20 ℃ to 900 ℃ [J]. Am J Sci, 1969, 267-A: 70-95.

Holland T, Powell R. A Compensated-Redlich-Kwong (CORK) Equation for Volumes and Fugacities of CO2 and H2O in the Range lbar to 50 kbar and 100-1600 ℃: [J]. Contrib Mineral Petrol, 1991, 109: 265-273.

Frantz J D, Marshall W L. Electrical Conductances and Ionization Constants of Salts, Acids, and Bases in Supercritical Aqueous Fluids: I. Hydrochloric Acid from 100 ℃ to 700 ℃ and at Pressures to 4000 bars [J]. Am J Sci, 1984, 284: 651-667.

Femandez D P, Mutev Y, Godwin A R H, et al. A Database for the Static Dielectric Constant of Water and Steam [J]. J Phys Chem Ref Data, 1995, 24: 33-69.

Watson J T R, Basu R S, Sengers J V. An Improved Representative Equation for the Dynamic Viscosity of Water Substance [J]. J Phys Chem Ref Data, 1980, 4: 1255-1290.

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