ION-PAIRING IN AQUEOUS MGSO4 SOLUTIONS ALONG AN ISOCHORE TO 500-DEGREES-C AND 11 KBAR USING RAMAN-SPECTROSCOPY IN CONJUNCTION WITH THE DIAMOND-ANVIL CELL

被引：35

作者：

FRANTZ, JD ^{[1
]}

DUBESSY, J ^{[1
]}

MYSEN, BO ^{[1
]}

机构：

[1] CREGU,CNRS,GDR 0077,F-54501 VANDOEUVRE NANCY,FRANCE

来源：

CHEMICAL GEOLOGY | 1994年 / 116卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0009-2541(94)90013-2

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

A high-temperature diamond-anvil cell is used in conjunction with micro-Raman spectrometer in the study of aqueous fluids containing 0.5 m MgSO4 along an isochore from room conditions to 500-degrees-C and 11 kbar. Gaskets lined with platinum are used to contain the chemically-reactive fluid. Ion-pairing of MgSO4 is shown to increase with increasing pressure along an isochore with a density of approximately 1 g cm-3. Mass-action constants for the reaction Mg2+ + SO4(2-) reversible MgSO4 range from 3.5 . 10(1) at 20-degrees-C, 1 bar to 1.25.10(4) at 500-degrees-C, 11.4 kbar. The results agree favorably with those obtained through electrical conductance measurements by V.G. Ritzert and E.U. Franck. The relative abundances of the species are shown as a function of temperature and pressure along the isochore.

引用

页码：181 / 188

页数：8

共 30 条

[1] ION ASSOCIATION OF MAGNESIUM SULFATE IN WATER AT 25 DEGREES [J].