相关实验视频

Updated: Jun 28, 2025

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

在铁氧化物主导的水土界面中,l-氨酸的迁移

Rui Wang^1,2, Xin Liu², Kun Li²

¹School of Chemistry and Chemical Engineering, Dazhou Key Laboratory of Advanced Technology for Fiber Materials, Key Laboratory of Low-cost Rural Environmental Treatment Technology in Education Department of Sichuan Province, Sichuan Institute of Arts and Science, Dazhou 635000, China.

Langmuir : the ACS journal of surfaces and colloids

|April 24, 2024

概括

在土壤中的有机 (SeMet) 迁移受到氧化铁的影响. 这些氧化物吸附SeMet,减少其氧化,并影响其环境循环和土壤修复.

科学领域:

环境化学环境化学
土壤科学土壤科学
地质化学地质化学

背景情况:

有机,特别是l-甲 (SeMet),占土壤总的很大一部分.
了解SeMet的移动性和转变对于循环和环境管理至关重要.

研究的目的:

为了研究SeMet在常见土壤铁氧化物 (ferrihydrite,goethite,hematite) 的存在下固体-液体分布,吸附,脱附和自我氧化.
阐明氧化铁在控制水土界面的SeMet迁移和转变中的作用.

主要方法:

进行了批量实验,以确定SeMet在固体 (氧化铁) 和液体相之间进行分区.
使用线性驱动力模型分析了吸附动力学.
在不同的条件下,通过酸盐和SeMet氧化进行脱量化.

主要成果:

氧化铁表现出显著的SeMet吸附,在各种度范围内固体/液体分离系数是恒定的.
SeMet吸附遵循线性驱动力模型,不同氧化铁的粒子内扩散系数有所变化.
酸盐诱导的SeMet脱氧是最小的 (<2.5%),并且氧化铁降低了SeMet溶液中的自我氧化率.

结论:

氧化铁在保持土壤中的SeMet中发挥着关键作用,影响其环境命运和运输.
和氧化铁之间的相互作用影响的生态化学循环,并为土壤修复策略提供了潜力.
SeMet可以诱导氧化铁纳米颗粒的聚合,协同增强酸盐吸附.

更多相关视频

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria

Published on: December 19, 2017

Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil

Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil

Published on: September 1, 2020

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...

Precipitation and Co-precipitation

Precipitation and Co-precipitation

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...

Formation of Complex Ions

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...