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Development of a New Method for Monitoring Time-Integrated Water Fugacity by the Use of Elastic Recoil Detection Analysis

开发利用弹性反冲检测分析监测时间积分水逸度的新方法

基本信息

批准号：
63470033
负责人：
NOZAKI Tadashi
金额：
$ 4.1万
依托单位：
Kitasato University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63470033/
关键词：
Elastic Recoil Detection Analysis (ERDA)Rutherford Back-scattering Analysis (RBS)Glass Surface H-D exchange Time-integrated Water-fugacity Cations in Soil Solutions 表面改質 HーD置換 H-D置換深さ分布

项目摘要

Cations in surfaces of various glasses were leached in H O or D O, and H-D exchange and H (D) -by-cation replacement in the hydrated layer were investigated mainly by elastic recoil detection analysis and Rutherford back-scattering, in search of possibilities for the use of the glasses in the monitoring of moisture and dissolved cations in the soil. Similarly with the hydration rate, the rates of the exchange and replacement were found to depend markedly on the composition of glass, especially on alumina content. For some soda-lime glasses of low alumina contents, the two reactions were shown to proceed by at least two stages and mechanisms of different temperature dependences. These results suggest the following potentialities in the utilization of glass for the monitoring : (1) the hydration rate of a sodium silicate glass for water fugacity in the soil, (2) the H-D exchange rate in low alumina-content glasses for water vapor in special, dry and hot area, though the exchange capacity is deficient for usual environments, and (3) rate and resultant depth profile of the H-by-cation replacement for cations in the soil. Our first plan for practical use of the glass monitors has delayed, but we are ready for field experiments by (1) and intend to begin soon other monitorings in collaboration with the institute of Academia Sinica in Ulumuqi, China. We can now obtain various glasses of desired compositions, and can use particle accelerators for the ERDA and RBS measurements. We have, however, still a lot of studies to carry out, preparing a variety of samples under well-defined conditions to obtain more reproducible data, before fully effectuating the practical monitoring.

利用弹性反冲分析和卢瑟福背散射技术研究了不同玻璃表面阳离子在H-O或D-O中的淋溶，以及水化层中的H-D交换和阳离子对H（D）的置换，探讨了玻璃用于土壤水分和溶解阳离子监测的可能性。与水化速率类似，交换和置换的速率被发现明显取决于玻璃的组成，特别是氧化铝含量。对于一些低铝含量的钠钙玻璃，这两个反应被证明是进行至少两个阶段和不同的温度依赖性的机制。这些结果表明，在利用玻璃进行监测方面具有以下潜力：（1）钠硅酸盐玻璃在土壤中的水逸度的水化速率;（2）低铝玻璃在特殊干热地区对水蒸气的H-D交换速率，尽管在通常环境中交换容量不足，（3）土壤中阳离子对H的置换速率及其深度分布。我们第一个实际使用玻璃监视器的计划已经推迟，但我们已经准备好在（1）之前进行实地实验，并打算开始与中国中央研究院乌鲁穆齐研究所合作进行其他监测。我们现在可以获得所需组成的各种玻璃，并可以使用粒子加速器进行ERDA和RBS测量。然而，在完全实现实际监测之前，我们仍有许多研究要进行，在明确定义的条件下制备各种样品，以获得更具重现性的数据。