低分子量有机酸对铁 (水) 氧化物转化和酸盐保留的影响
Yu Liang1, Jing Liu2, Jiezi Jin3
1Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China.
The Science of the total environment
|June 1, 2024
概括
低分子量有机酸 (LMWOA) 通过影响铁 (水) 氧化物,影响土壤中的酸盐保留. 这项研究表明,LMWOAs可以减少吸附,但通过矿物转化增强保留,影响可用的酸盐水平.
科学领域:
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
- 环境化学环境化学
背景情况:
- 土壤中酸盐的保留对植物营养至关重要,并受到铁 (水) 氧化物和根液的影响.
- 低分子量有机酸 (LMWOA) 是影响矿物相互作用和营养物质可用性的关键土壤成分.
研究的目的:
- 调查LMWOAs在铁 (水) 氧化物介导的酸盐调动和保留中的双重作用.
- 了解LMWOAs对酸盐动态的影响,从微观矿物相互作用到现场规模的农业实践.
主要方法:
- 化实验评估LMWOAs对铁 (水) 氧化物对酸盐吸附的影响.
- 树根箱实验模拟根排泄,并分析土壤酸盐和铁分数.
- 实地实验评估了作物覆盖对果园LMWOAs排泄和土壤酸盐的影响.
主要成果:
- LMWOAs在铁 (水) 氧化物上降低了高达74%的酸盐吸附能力,但通过矿物转化增加了整体保留量的六倍.
- 树根盒研究表明,LMWOAs在根部附近可用的酸盐减少了10-30%.
- 实地试验表明,覆盖作物的LMWOAs排泄增强,将总和可用的土壤酸盐分别增加到61%和147%.
结论:
- LMWOAs对酸盐动态产生复杂的影响,平衡吸附竞争与矿物转化.
- 这些发现突出了LMWOA在调节富含铁的土壤中酸盐的可用性方面的作用.
- 了解这些LMWOAs-铁-酸盐相互作用为改善农业中酸盐利用效率提供了策略.
相关概念视频
04:01Factors Affecting Solubility
33.4K
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:
33.4K
00:56Extraction: Advanced Methods
446
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...
446
00:49Gravimetry: Inorganic And Organic Precipitating Agents
1.2K
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...
1.2K
01:22Phosphate Buffer
1.2K
The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
1.2K
02:49Corrosion
24.0K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
24.0K
03:38Polyprotic Acids
29.1K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
29.1K