A method for isotope exchange kinetics in mineral-water system-an in-situ study on oxygen isotope exchange in Na2CO3-H2O system

被引：0

作者：

Wang, Shixia ^{[1
]}

Lu, Kaijie ^{[1
]}

Wang, Teng ^{[1
]}

Wu, Jia ^{[2
]}

Zheng, Haifei ^{[3
]}

Huang, Yiguo ^{[1
]}

机构：

[1] Univ Shanghai Sci & Technol, Coll Sci, Shanghai 200093, Peoples R China

[2] China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China

[3] Peking Univ, Dept Geol, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2020年 / 241卷

基金：

中国国家自然科学基金;

关键词：

Oxygen isotope exchange; In-situ Raman spectroscopy; Na2CO3-H2O system; Kinetic study; Hydrothermal diamond anvil cell (HDAC); DIAMOND-ANVIL CELL; HIGH-TEMPERATURE; CARBONIC-ACID; HIGH-PRESSURE; BICARBONATE; CALCITE;

D O I：

10.1016/j.saa.2020.118648

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

The experiments on the exchange reaction rate of the oxygen isotopes in the mineral-water system with initial conditions of 100 degrees C and 240 MPa, 100 degrees C and 924 MPa, 118 degrees C and 170 MPa are taken. The oxygen isotope O-18 exchange reactions between aqueous C16O32- and (H2O)-O-18 are mainly traced by measuring the Raman peak intensity of oxygen-containing elements (CO32-) in sodium carbonate solution. The inconsistent trends between the molar fraction and the concentration of (CO2O2-)-O-18-O-16 indicate oxygen isotope exchange between sodium carbonate and heavy water accompanied by dissolution and recrystallization between supersaturated sodium carbonate solution and solid sodium carbonate. In the heterogeneous experimental systems the order of oxygen isotope exchange reactions are more than 1 and the dynamics of oxygen isotope exchange conform to JMAK kinetics model with the nucleation and growth processes of sodium carbonate crystal. (c) 2020 Elsevier B.V. All rights reserved.

引用

页数：7

共 29 条

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