与环境中溶解的有机物质的结合亲属性:水友/恐惧分量的行为差异和环境影响
Ning-Xin Wang1, Yi-Han Cheng2, Yu-Lai Wang2
1School of Environmental Engineering, Nanjing Institute of Technology, Nanjing, 211167, China; School of hydrology and water resources, Nanjing University of Information Science and Technology, Nanjing, 210044, China.
The Science of the total environment
|December 2, 2025
概括
研究了 (As) 与水溶性有机物 (WSOM) 分数的结合. 水友和过渡分数显著影响了天然水中的As复杂化和生物可用性.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 水质分析 水质分析
背景情况:
- 水溶性有机物 (WSOM) 在水环境中对 (As) 的命运和运输起着至关重要的作用.
- 了解不同WSOM分量的复合性质对于预测As生物可用性和毒性至关重要.
- 湖流域的WSOM特征需要详细调查关于A的约束性.
研究的目的:
- 调查来自Chaohu湖盆地的环境WSOM分量的As结合性质.
- 确定WSOM极性 (水友性,过渡性,疏水性) 对As复杂化的影响.
- 评估WSOM特性与As吸附效率和生物可用性之间的关系.
主要方法:
- 根据极性,将WSOM分离和提取为水友性 (HPI-WSOM),过渡性 (TPI-WSOM) 和疏水性 (HPO-WSOM) 分数.
- 测量透析袋内外As度以分析复合平衡.
- 使用条件分布系数 (Kd) 来量化As的结合,并根据DOC与As的比率 (Fc) 来评估吸附效率 (AE).
主要成果:
- 在它们的组成上,WSOM 分数有很大的差异:HPI-WSOM (8.759.2%),TPI-WSOM (19.174.1%),和HPO-WSOM (17.237.5%).
- 富含HPO的水生植物的WSOM显示As复杂化的平衡时间较长.
- 在AE和Fc之间的强有力的线性相关性 (R2=0.850.99) 表明可预测的As特异和生物可用性.
- 沉积物WSOM具有最高的Kd值,与更高的HPI和TPI含量相关,而农田土壤WSOM具有最低的Kd值.
- 过渡分数 (TPI) 被确定为As复杂化过程中的关键参与者.
结论:
- WSOM 分的极性显著影响的结合动态和复杂化.
- DOC与As的度比是As吸附效率和生物可用性的可靠预测指标.
- 过渡WSOM分数在水生系统中复合中发挥着关键作用.
相关概念视频
Extraction: Advanced Methods
1.0K
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...
1.0K
Atomic Absorption Spectroscopy: Lab
979
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...
979
Factors Affecting Solubility
36.5K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
36.5K
Atomic Absorption Spectroscopy: Interference
2.0K
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
2.0K
Structure-Activity Relationships and Drug Design
1.7K
Drug design is a dynamic field that involves discovering and developing new medications based on specific biological targets. This process heavily relies on structure-activity relationships (SAR) and quantitative structure-activity relationships (QSAR) to guide the design and optimization of efficient drugs.
SAR studies the intricate relationship between a drug's chemical structure and biological activity. It focuses on understanding how modifications to a drug's structure can influence...
SAR studies the intricate relationship between a drug's chemical structure and biological activity. It focuses on understanding how modifications to a drug's structure can influence...
1.7K
Atomic Emission Spectroscopy: Interference
579
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
579


