0.25—3.75GPa和20—370℃条件下0.025mol NaCl溶液电导率研究
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摘要
在0.25—3.75GPa和20—370℃条件下测量了NaCl溶液的电导率。结果表明:①电导率随温度增高而增大,且电导率的对数与温度的倒数为线性关系,但不同压力下其斜率不同。②电导率与压力的关系较为复杂,存在着不连续性。即在2.25—3.75GPa压力范围,电导率随压力增大而增大;在1.25—2.00GPa压力范围,电导率与压力几乎无关;0.75GPa压力的电导率高于相邻压力的电导率。上述电导率特征反映了不同压力下NaCl溶液具有非常不同的电化学性质,并可能是造成下地壳存在高导层和上地幔存在地震波低速层的重要原因。
The electrical conductance of NaCl solution was measured at 0. 25-3. 75 GPa and 20-370℃. The results show that:(1) the conductance increases with the temperature, and there is a linear relation between the logarithm of the conductance and the reciprocal of the temperature, but their slopes are different at different pressures; (2) the relation of the conductance with the pressure is rather complex and there are some discontinuities between the conductance and the pressure, that is, the conductance increases with the pressure in the range of 2. 25-3. 75 GPa, but almost doesn't change with the pressure in the range of 1. 25-2. 00 GPa, and the conductance at 0. 75 GPa is higher than that at the nearby pressures. This indicates that the NaCl solution has quite different electrochemical properties at different pressures, and probably is an important cause for the existence of the high-conductance layer in the lower crust and the low-velocity layer in the upper mantle.
The electrical conductance of NaCl solution was measured at 0. 25-3. 75 GPa and 20-370℃. The results show that:(1) the conductance increases with the temperature, and there is a linear relation between the logarithm of the conductance and the reciprocal of the temperature, but their slopes are different at different pressures; (2) the relation of the conductance with the pressure is rather complex and there are some discontinuities between the conductance and the pressure, that is, the conductance increases with the pressure in the range of 2. 25-3. 75 GPa, but almost doesn't change with the pressure in the range of 1. 25-2. 00 GPa, and the conductance at 0. 75 GPa is higher than that at the nearby pressures. This indicates that the NaCl solution has quite different electrochemical properties at different pressures, and probably is an important cause for the existence of the high-conductance layer in the lower crust and the low-velocity layer in the upper mantle.
引文
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3 Tanger J C, Pitzer K S. Calculation of the ionization constant of H_2O to 2273K and 500MPa. AICHE J., 1989, 35: 1631-1638．
4 Eberz A, Franck E U. High pressure electrolyte conductivity of the homogeneous, fluid water-sodium hydroxide system to 400 C and 300 bar. Berichte der Bunsengesellschaft fur Physikalische Chemie, 1995, 99 (9) : 1091-1103．
5 Ho P C, Palmer D A, Mesmer R E. Electrical conductivity measurements of aqueous sodium chloride solutions to 600 ℃and 300MPa. Journal of Solution Chemistry, 1994, 23(9) : 997-1018．
6 徐有生,谢鸿森,郭 捷,郑海飞,张月明,宋茂双.0． 4-5． 0GPa和室温-500 C下 NaCl溶液的电导率.中国科学(D辑),1997,42(8) :39-43．
7 Holland T, Powell R. Compensated-Redlich-Kwong (CORK) equation for volumes and fugacities of CO_2 and H_2O in the range 1 bar to 50 kbar and 100 1600 C.Contrib. Mineral. Petrol.. 1991, 109: 265-273．
8 Lin-gun Liu and Willliam A. Bassett, elements, oxides. silicates: high-pressure phases with implications for the Earth's in terior. Oxford University Press, New York and Clarendon Press, Oxford, 1986． 92-94．
9 Franck E U, Roth K. Infrared absorption of HDO in water at high pressure and temperature. Discus. Frarady Soc., 1967,43: 108-114．
10 万明浩,秦顺亭,起风梧,崔荣旺.岩石物理性质及其在石油勘探中的应用.北京:地质出版社,1994． 145-148页.
11 吴其斌,张肇元.全球地学大断面计划.项仁杰等编.地壳和上地幔研究.北京:地震出版社,1991． 25-39页.
12 郑海飞,谢鸿森,徐有生,宋茂双,张月明,王明再,徐惠刚.高温高庄下含水矿物对岩石熔点影响的实验研究.地质学报,1995,69(4) :326-335．
2 Marshall W L, Franck E U. Ion product of water substance at 0-1000C, 1-10000bars, new international formulation and its background. Phys. Chem. Ref. Data, 1981, 10: 295-304．
3 Tanger J C, Pitzer K S. Calculation of the ionization constant of H_2O to 2273K and 500MPa. AICHE J., 1989, 35: 1631-1638．
4 Eberz A, Franck E U. High pressure electrolyte conductivity of the homogeneous, fluid water-sodium hydroxide system to 400 C and 300 bar. Berichte der Bunsengesellschaft fur Physikalische Chemie, 1995, 99 (9) : 1091-1103．
5 Ho P C, Palmer D A, Mesmer R E. Electrical conductivity measurements of aqueous sodium chloride solutions to 600 ℃and 300MPa. Journal of Solution Chemistry, 1994, 23(9) : 997-1018．
6 徐有生,谢鸿森,郭 捷,郑海飞,张月明,宋茂双.0． 4-5． 0GPa和室温-500 C下 NaCl溶液的电导率.中国科学(D辑),1997,42(8) :39-43．
7 Holland T, Powell R. Compensated-Redlich-Kwong (CORK) equation for volumes and fugacities of CO_2 and H_2O in the range 1 bar to 50 kbar and 100 1600 C.Contrib. Mineral. Petrol.. 1991, 109: 265-273．
8 Lin-gun Liu and Willliam A. Bassett, elements, oxides. silicates: high-pressure phases with implications for the Earth's in terior. Oxford University Press, New York and Clarendon Press, Oxford, 1986． 92-94．
9 Franck E U, Roth K. Infrared absorption of HDO in water at high pressure and temperature. Discus. Frarady Soc., 1967,43: 108-114．
10 万明浩,秦顺亭,起风梧,崔荣旺.岩石物理性质及其在石油勘探中的应用.北京:地质出版社,1994． 145-148页.
11 吴其斌,张肇元.全球地学大断面计划.项仁杰等编.地壳和上地幔研究.北京:地震出版社,1991． 25-39页.
12 郑海飞,谢鸿森,徐有生,宋茂双,张月明,王明再,徐惠刚.高温高庄下含水矿物对岩石熔点影响的实验研究.地质学报,1995,69(4) :326-335．
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