在溶解物质和土壤有机物质中,伯尼赛特介导的转化和物种化
Oluwadunsin Oyetunji1, Oliver A H Jones2, Suresh Subashchandrabose3
1Department of Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia.
Environmental science & technology
|July 16, 2025
概括
氧水氧化物 (MnOx) 影响土壤中的 (P) 物种化和转化. 伯尼西特介导P结合并稳定有机P,影响P的移动性和保留.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- 矿物相互作用在自然环境中显著影响 (P) 物种的形成.
- 氧化 (MnOx) 是强大的天然氧化剂,可能影响有机P转化,但它们在分子P转化和自然有机物质的物种化中的作用尚不清楚.
研究的目的:
- 在不同的pH条件下,研究化衍生的有机P的分子转化和物种化.
- 阐明MnOx,特别是birnessite在调解溶解有机物 (DOM) 和土壤系统中的P转化和稳定中的作用.
主要方法:
- 利用K边缘X射线吸收近边缘结构 (XANES) 谱学来分析P物种化.
- 采用里埃转换离子循环子子共振质谱法 (FT-ICR-MS) 来评估有机P的分子转换.
- 在酸性 (pH4) 和性 (pH8) 条件下,在DOM和土壤矩阵中进行了超过35天的实验.
主要成果:
- 在DOM的pH值为4时,形成了birnessite吸收的酸盐和Mn (II/III) 酸盐,而在pH值为8时形成了酸盐.
- 在土壤中,birnessite-adsorbed酸盐是占主导地位的物种,35天后酸盐也存在.
- 酸性条件增强了有机P吸收,并促进了转化为更高分子量芳香化合物.
结论:
- 伯尼石在P物种化中扮演着双重角色,通过调解表面和氧化还原驱动相互作用.
- 伯尼西特通过分子转化促进有机P稳定,影响自然环境中的P命运.
- 这项研究提供了对MnOx对P流动性和在土壤中长期保留P的影响的关键见解.
相关概念视频
01:21The Phosphorus Cycle
38.9K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
38.9K
01:15Metabolism of Chemolithotrophs
183
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
183
04:01Factors Affecting Solubility
33.9K
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:
33.9K
00:54What are Biogeochemical Cycles?
34.4K
The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
34.4K
01:30Environmental Applications of Microorganisms
268
Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
268
00:53Extraction: Effects of pH
721
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...
721