相关实验视频

Updated: Jun 24, 2025

Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions

Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions

Published on: February 15, 2019

两相系统模型预测中国各地的疏水性有机化合物分离到异质的土壤溶解有机物

Kun Liu¹, Liang Ding², Xinwei Zhou³

¹Key Laboratory of Environmental Remediation and Ecological Health, Ministry of Industry and Information Technology, Jiangsu Environmental Engineering Technology Co., Ltd, Nanjing, Jiangsu, 210019, China; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, 210023, China.

|June 13, 2024

概括

土壤溶解有机物 (SDOM) 呈现出显著的区域差异. 一个两相系统模型有效地预测了污染物吸附,有助于评估受污染场所的风险.

科学领域:

环境化学环境化学
土壤科学土壤科学
有机地化学有机地化学

背景情况:

土壤溶解有机物 (SDOM) 对污染物运输和陆地生态系统的命运至关重要.
了解SDOM异质性对于准确的环境风险评估至关重要.
以前的DOM分区模型主要在水生系统中得到验证.

研究的目的:

为了比较来自不同中国地区的SDOM的特点.
评估二相系统 (TPS) 模型用于预测SDOM疏水性和吸附性的适用性.
评估TPS模型对疏水性有机化合物 (HOCs) 风险评估的潜力.

主要方法:

光谱技术:紫外线,光和里埃变换红外光谱 (FTIR).
使用水性双相系统 (ATPS) 分割系数 (K_ATPS) 的疏水性量化.
应用和验证二相系统 (TPS) 模型用于预测有机碳水分区系数 (K_OC).

主要成果:

SDOM在不同地区的分子量,芳香度和疏水性有显著的异质性.
K_ATPS,UV-vis和光指数可以有效地区分异构的SDOM.
在没有校准的情况下,TPS模型准确地预测了异质SDOM的K_OC (RMSE = 0.11),证明了广泛的适用性.

结论:

SDOM的组成和结构不同于水中溶解有机物 (DOM).
该TPS模型适用于陆地SDOM,扩大其使用范围超出淡水系统.
该TPS模型显示了在受污染的土壤中对HOCs的常规风险评估的潜力.

关键词:

疏水性有机化合物疏水性有机化合物分区分区分区分区分区预测模型的预测模型.土壤中溶解的有机物质.频谱特征频谱特征频谱特征频谱特征

更多相关视频

Utilizing Soil Density Fractionation to Separate Distinct Soil Carbon Pools

Utilizing Soil Density Fractionation to Separate Distinct Soil Carbon Pools

Published on: December 16, 2022

Dissolved Solute Sampling Across an Oxic-Anoxic Soil-Water Interface Using Microdialysis Profilers

Dissolved Solute Sampling Across an Oxic-Anoxic Soil-Water Interface Using Microdialysis Profilers

Published on: March 24, 2023

相关概念视频

Extraction: Advanced Methods

Extraction: Advanced Methods

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...

Extraction: Effects of pH

Extraction: Effects of pH

Consider a neutral form of an amine, B, with a partition coefficient, K, in a liquid mixture containing organic and aqueous phases. The pH of the aqueous phase affects the charge on acidic and basic solutes, and the charged form is usually more soluble in the aqueous phase. Suppose the conjugate acid form of the amine is soluble only in the aqueous phase while the base form is soluble in both phases. Then the distribution coefficient, D, can be given as the ratio of amine concentration in the...