Establishment for the measurement of silicate species dissolved in natural waters and analysis of their data

天然水中溶解的硅酸盐物质测量方法的建立及其数据分析

• 批准号: 13640598
• 负责人: TAKAHASHI Miho
• 金额: $ 2.18万
• 依托单位: Tokyo University of Marine Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640598/
• 关键词: silicate species doissolved; establishment for the measurement of silicate species; basic data of silicate complexes; cyclic silicate complex; linear silicate complex; sodium replaced complex; FAB-MS; salting-out; シリカ化学種; FAB-MS; 溶質の性質; 塩溶液の性質

The chemical compositions of natural waters have been well studied, however, the method to analyze the chemical species of silica as they are, has not been established. The final purpose of this study is to elucidate the behavior and circulation of silica in the global scale : the silicate species dissolved in natural waters and the chemical behavior between aquatic phase and solid phases.It is known that silica is dissolved in sodium and calcium chloride solutions. In the natural waters, many kinds of ions, such as sodium, calcium, potassium, chloride, nitrate, sulfate ions and so on, are contained with various compositions to affect the behavior of silica. Fox example, the estuary, where river and sea water are mixed, the dissolved silica becomes deposits by the coagulation and salting-out effect, but their mechanism has not been cleared. The salting-out effect could be elucidated from the view point of molecular level of silicate species on the basic data in laboratory. As the result, it is shown that the proton of silanol group (Si-OH) in silicate complex is easily replaced by sodium ion and calcium ion, and calcium ion makes complex with silicate ion with bidentate. On the other hand, silicate ion cannot make complex with lithium ion and magnesium ion. This shows that the ionic radii is the important factor to make complex with silicate ion. The most important results are mentioned that, generally, silicate ion is considered to be monomer, however, in the solution, dimer, linear tetramer and cyclic tetramer are more stable complexes than monomer in the solution.The results of this study have been reported in the papers in the later list. For the applications of this study, the silica species dissolved in natural hot springs and deep seawaters could be characterized.

天然沃茨的化学组成已得到很好的研究，然而，分析二氧化硅化学形态的方法尚未建立。本研究的最终目的是阐明二氧化硅在全球范围内的行为和循环：溶解在天然沃茨中的硅酸盐物种以及水相和固相之间的化学行为，已知二氧化硅溶解在钠和氯化钙溶液中。天然沃茨中含有多种离子，如钠、钙、钾、氯离子、硝酸根、硫酸根等，其组成各异，影响着二氧化硅的行为。以河口为例，在江、海水交汇处，溶解态硅通过混凝和盐析作用形成沉积物，但其机理尚未完全清楚。在实验室基础数据的基础上，可以从硅酸盐物种的分子水平来解释盐析效应。结果表明，硅酸盐络合物中硅醇基（Si-OH）上的质子容易被钠离子和钙离子取代，钙离子与硅酸盐离子形成双齿络合物。另一方面，硅酸根离子不能与锂离子和镁离子络合。这说明离子半径是影响与硅酸根离子形成络合物的重要因素。最重要的结果是，一般认为硅酸根离子是单体，但在溶液中，二聚体、线性四聚体和环状四聚体是比单体更稳定的络合物，这一研究结果已在后面的列表中的论文中报道。本研究应用于天然温泉及深海海水中溶解之矽物种之特性分析。

项目成果

Miho Tanaka, Kazuya Takahashi: "Main species of silica dissolved in calcium chloride solution and their chemical implications for silica species in sodium chloride solution."J.Trace and Microprobe Techniques. 19(4). 581-589 (2001)

Miho Tanaka、Kazuya Takahashi：“溶解在氯化钙溶液中的二氧化硅的主要种类及其对氯化钠溶液中二氧化硅种类的化学影响。”J.Trace and Microprobe Techniques。

Miho Tanaka, Kazuya Takahashi, Yu Vin Sahoo: "Dissolved Silicate Behavior with Cations from Chemical Speciation in Hydrologic System of Arid Lands for the Case in N.W.China."Analytical and Bioanalytical Chemistry. 378. 789-797 (2004)

Miho Tanaka、Kazuya Takahashi、Yu Vin Sahoo：“以中国西北地区干旱地区水文系统中的化学形态为基础的溶解硅酸盐行为与阳离子”，分析与生物分析化学。

田中 美穂: "高速原子衝撃質量分析法による海水中のシリカ溶存化学種の解析"分析化学. (in press).

Miho Tanaka：“使用高速原子撞击质谱法分析海水中溶解的二氧化硅化学物质”分析化学（正在出版）。

Miho Tanaka, Kazuya Takahashi: "Vertical distribution of soluble silica and Na+ in the soil in a saline area, Xinjiang N.W.China, and its environmental implications."Archives and Complex Environmental Studies. (in press).

Miho Tanaka、Kazuya Takahashi：“中国西北新疆盐碱地区土壤中可溶性二氧化硅和钠的垂直分布及其环境影响。”档案和复杂环境研究。

Sachiko wakasugi, Miho Tanaka^*, Masaru Maeda: "Identification and determination of sulfur compound dissolved in water from volcanic ashes of Mt.Miyake island and their effect to the environment."Bunsekikagaku. 52(11). 997-1004 (2003)

Sachiko wakasugi、Miho Tanaka^*、Masaru Maeda：“三宅岛火山灰中溶解在水中的硫化合物的鉴定和测定及其对环境的影响。”Bunsekikagaku。