AN ONLINE EXPERIMENTAL ANALYTICAL METHOD FOR MEASURING THE KINETICS OF OXYGEN-ISOTOPE EXCHANGE BETWEEN CO2 AND SALINE HYPERSALINE SALT-SOLUTIONS AT LO (25-50-DEGREES-C) TEMPERATURES

被引：16

作者：

FORTIER, SM

机构：

[1] Institut für Mineralogie, Petrologie und Geochemie, Universität Tübingen, D-72074 Tübingen

来源：

CHEMICAL GEOLOGY | 1994年 / 116卷 / 1-2期

关键词：

D O I：

10.1016/0009-2541(94)90164-3

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：

An on-line experimental/analytical method for measuring the kinetics of oxygen isotope exchange between CO2 and saline/hypersaline salt solutions at low (25-50-degrees-C) temperatures has been tested in the system CO2-H2O-Ca2+-Cl-. The rate constants can be expressed by: ln k = -6.39 - 180mT-1 where m = molality (mol kg-1); and T = temperature (K) for CaCl2 solutions from 0 to 4.0 m between 25-degrees and 50-degrees-C. The effect of the shaking frequency on equilibration time is significant at frequencies below 2.0 Hz. Equilibration times are increased because the isotopic exchange is increasingly limited by transport of gas through the liquid. Above 2.0 Hz the rate constants are independent of the shaking frequency. The rate constants do not depend on p(co2) over the range used in this study (300-600 mbar).

引用

页码：155 / 162

页数：8

共 26 条

[1] BRINE MIGRATIONS ACROSS NORTH-AMERICA - THE PLATE-TECTONICS OF GROUNDWATER [J].