Analyses of the cycling process of the trace metals in lake water by chemical speciation

通过化学形态分析湖水中微量金属的循环过程

• 批准号: 10680499
• 负责人: ITOH Akihide
• 金额: $ 2.11万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680499/
• 关键词: natural water; trace metal; ICP-MS; speciation; large organic complex; colloid

The chemical stability of large organic molecule-metal complexes (LOMMCs) dissolved in pond water were investigated by a hyphenated system of size exclusion chromatography/UV absorption detection/inductively coupled plasma mass spectrometry (SEC/UV/ICP-MS) after ultrafiltration using a filter with a molecular permeation limit larger than 10,000 Da. LOMMCs dissolved in the preconcentrated pond water sample were observed at the retention times corresponding to molecular weights larger than 300,000 Da (Peak I) and that of 10,000-50,000 Da (Peak II) in the chromatograms measured by UV absorption and ICP-MS. When the pH of the sample solution. These results indicate that LOMMCs were decomposed by addition of HNOィイD23ィエD2. Peak I was rapidly decomposed below pH4, while Peak II was gradually decomposed over the pH range from 7.0 to 0.5. The decomposition curve of Peak I was similar to the solubility characteristics of hydroxides of Fe and Al. On the other hand, that of Peak II suggested the dissociations of metal complexes (Cu and Zn) with some biogenic organic molecules. It was concluded from these results that some colloidal particles of hydroxides of Fe and Al may be core materials of LOMMCs for Peak I, while some metal complexes with biogenic protein-like compounds may be LOMMCs for Peak II. The possible models for LOMMCs in pond water were proposed as "a string-ball model", which might interpret as the removal and preservation mechanisms for trace elements in natural water.

采用体积排阻色谱/紫外吸收检测/电感耦合等离子体质谱联用技术研究了有机大分子金属配合物（LOMMCs）在池塘水中的化学稳定性（SEC/UV/ICP-MS）使用分子渗透限大于10的过滤器超滤后，在对应于分子量大于300，000 Da（峰I）和10，000- 50，000 Da（峰II）。这些结果表明，LOMMC通过添加HNO氧化物D23氧化物D2而分解。峰I在低于pH 4时迅速分解，而峰II在7.0至0.5的pH范围内逐渐分解。峰I的分解曲线与Fe和Al氢氧化物的溶解度特征相似，峰II的分解曲线表明金属配合物（Cu和Zn）与某些生物有机分子发生了解离。从这些结果可以得出结论，一些胶体颗粒的Fe和Al的氢氧化物可能是核心材料的LOMMC的峰I，而一些金属配合物与生物蛋白样化合物可能是LOMMC的峰II。提出了池塘水体中LOMMCs的可能模型为“弦球模型”，该模型可解释天然水体中微量元素的迁移和保存机制。

项目成果

Hiroki HARAGUCHI: "Speciation of the Lanthanide Elements in Natural Water by Inductively Coupled Plasma Mass Spectrometry after Preconcentration by Ultrafiltration and with a Chelating Resin"Analyst. 123(5). 773-778 (1998)

Hiroki HARAGUCHI：“通过超滤和螯合树脂预浓缩后，通过电感耦合等离子体质谱法对天然水中的镧系元素进行形态分析”分析师。

A. Itoh: "Multielement Determination of Rare Earth Elements in Geochemical Samples by Liquid Chromatography/Inductively Coupled Plasma Mass Spectrometry"Analytical Science. 15・1. 17-22 (1999)

A. Itoh：“利用液相色谱/电感耦合等离子体质谱法测定地球化学样品中的稀土元素”《分析科学》15・1（1999）。

Akihide ITOH: "Chemical Stability of Large Organic Molecule-Metal Complexes Dissolved in Natural Water as Studied by Size Exclusion Chromatography /Inductivity Coupled Plasma Mass Spectrometry"Bulletin of Chemical Society of Japan. 73(1). 121-127 (2000)

Akihide ITOH：“通过尺寸排阻色谱法/电感耦合等离子体质谱法研究溶解在天然水中的大有机分子-金属络合物的化学稳定性”日本化学会会刊。

H. Haraguchi: "Speciation of the Lanthanide Elements in Natural Water by Inductively Coupled Plasma Mass Spectrometry after Preconcentration by Ultrafiltration and with a Chelating Resin"Analyst. 123・5. 773-778 (1998)

H. Haraguchi：“通过超滤和螯合树脂预浓缩后的电感耦合等离子体质谱法分析天然水中的镧系元素”123・5（1998）。

紀杉: "天然塩製塩過程における海水から塩への元素の分配"分析化学. 49・2. 111-119 (2000)

Kisugi：“天然盐生产过程中元素从海水到盐的分离”分析化学49・2（2000）。