通过由堆肥衍生的溶解有机物减少六价
Chuanghe Miao1, Hui Rong1, Xiaoqing Wei1
1College of Land Science and Technology, China Agricultural University, Beijing 100193, P. R. China. lyz@cau.edu.cn.
Environmental science. Processes & impacts
|November 15, 2024
概括
由堆肥衍生的溶解有机物 (DOMC) 有效地将六价 (Cr(VI)) 减少为三价 (Cr(III)). 酸分数比酸分数具有更高的还原能力,pH值显著影响反应.
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:
- 堆肥衍生的溶解有机物 (DOMC) 含有氧化还原活性分子.
- 六价 (Cr(VI)) 是一种有毒的环境污染物.
- DOMC可能会通过减少影响Cr (VI) 的环境动态.
研究的目的:
- 调查DOMC和土壤湿性物质对Cr(VI) 的相互作用和减少.
- 为了比较酸 (HA) 和酸 (FA) 分数的Cr (VI) 降解能力 (TRC).
- 为了确定有机物成分和pH对Cr (VI) 减少的影响.
主要方法:
- 将DOMC,黑土壤湿物质和红土壤湿物质分成HA和FA分量.
- 对每个分数的Cr (VI) 减少能力 (TRC) 的量化.
- 分析有机物组成 (TOC,TN,C类型) 和光谱分析 (UV-Vis) 以评估相互作用.
- 在不同的pH值 (2和6) 下对Cr(VI) 减少的研究.
主要成果:
- 六个有机物质分量的TRC在每毫克OM中介于26.77-49.34μM Cr (VI) 之间.
- 酸分离物 (HAC,HAB,HAR) 的TRC比酸分离物 (FAC,FAB,FAR) 的TRC更高.
- DOMC的TRC高于黑色和红色土壤湿性物质.
- TRC与TOC,TN,C,基C和芳香C正相关;与E2/E3,O-基C和基C负相关.
- 在pH 2时发生了显著的Cr (VI) 减少 (32-67%),而在pH 6时观察到微不足道的减少.
- 在pH 2-6的Cr (VI) 降解能力与C含量正相关.
结论:
- DOMC是一种强大的Cr降解剂,其中酸成分更有效.
- 有机物,特别是结构的组成和溶液的pH值是控制Cr6降解的关键因素.
- DOM在土壤和水生系统中对Cr (VI) 的环境命运和转化起着重要作用.
相关概念视频
Extraction: Advanced Methods
425
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...
425
Bioremediation
18.2K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.2K
Sample Preparation for Analysis: Advanced Techniques
301
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...
301
Oxidation and Reduction of Organic Molecules
6.2K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
6.2K
Redox Titration: Other Oxidizing and Reducing Agents
245
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
245


