在煤的水溶性提取物中溶解的有机物复合物
Ann S Ojeda1, Caitlyn Herron1, Yaniv Olshansky2
1Department of Geosciences, Auburn University, USA.
Chemosphere
|September 15, 2023
概括
(As) 在地下水中的流动性受到溶解有机物 (DOM) 的影响. 这项研究表明,化衍生DOM形成As-DOM复合体,影响地下水系统中的物种化.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 公共卫生 公共卫生
背景情况:
- 地下水中的 (As) 污染对全球健康构成重大风险.
- 的流动性越来越多地通过复杂化与溶解有机物 (DOM) 联系在一起.
- 现有关于As-DOM相互作用的研究主要使用地表水DOM,忽视地下水DOM.
研究的目的:
- 通过使用从红中衍生的地下水模拟DOM来研究As-DOM复合.
- 描述由煤衍生DOM形成的As-DOM复合物的大小,丰度和结合特性.
- 为了比较煤DOM与标准地表水有机物质的As结合特性.
主要方法:
- 模拟地下水DOM使用煤沉积物的水可提取有机物 (WEOM).
- 经过处理的WEOM提取物含有不同度的.
- 使用尺寸排除色谱与ICP-MS,光和可变探测器相结合,分析了As-DOM复合体.
主要成果:
- 确定了两个As-DOM大小分数 (∼1kDa和∼15kDa),较小的分数更丰富.
- 与苏瓦尼河天然有机物 (SRNOM) 相比,矿衍生DOM对As的条件分布系数更高.
- 化物DOM的酸盐最大度 (Bmax) 较高,表明具有更强的As结合.
结论:
- 作为-DOM复杂化是控制地下水中物种化的关键因素.
- 来自矿的DOM在地下水环境中的的流动性和命运中发挥着重要作用.
- 了解As-DOM相互作用对于评估和减轻地下水中污染风险至关重要.
相关概念视频
Extraction: Advanced Methods
482
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
482
Sample Preparation for Analysis: Advanced Techniques
389
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
389
Precipitation and Co-precipitation
1.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.8K
Complexometric Titration: Ligands
988
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
988
Gravimetry: Inorganic And Organic Precipitating Agents
1.3K
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
1.3K
Atomic Absorption Spectroscopy: Lab
478
For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
478


