稀土元素在风化地土中的运输动态
Shichang Kang1, Bowen Ling2, Gaofeng Wang1
1CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Material, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China.
The Science of the total environment
|April 30, 2024
概括
本研究介绍了离子吸附沉积物中稀土元素 (REE) 运输的统一模型,改善了预测,并减少了采矿对环境的破坏. 新模型将吸附和运输动力学相结合,用于准确的REE移动模拟.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 稀土元素 (REEs) 在现代工业中至关重要.
- 离子吸附沉积物 (IADs) 在侵蚀地土壤中容纳REEs,而采矿由于漂水剂造成了重大环境问题.
- 现有的模型不充分地描述了REE运输动态,因为它们将吸附和运输独立处理.
研究的目的:
- 开发一个统一的工作流程,将吸附和运输动态集成在一起,以预测土壤地中的REE运输.
- 使用弗洛伊德利希等热法准确地建模REE吸附,并用一种advection-dispersion-adsorption-equation (ADAE) 模型预测运输动态.
- 模拟长期的REE运输和堆积在现场规模的气候变化地中,以减轻环境影响.
主要方法:
- 研究了IADs上的REE吸附,将数据与弗洛伊德利希等热量相匹配.
- 开发并应用于土壤柱的advection-dispersion-adsorption-equation (ADAE) 模型,以预测REE突破曲线.
- 模拟了100年REE运输和堆积在现场规模的气候变化皮层中.
主要成果:
- REE吸附遵循弗洛伊德利希等温度 (R2 > 0.9826),对La3+,Sm3+,Er3+和Y3+具有特定的吸附能力.
- ADAE模型准确地预测了REE运输动态,和时间取决于流速.
- 模型模拟预测了REE在一个世纪以来在高度受天气影响的层中积累.
结论:
- 统一的工作流可以有效地预测土壤地的REE运输动态.
- 开发的ADAE-Freundlich和ADAE-Toth模型为REE运输设定了上限和下限.
- 这种预测能力可以显著减少漂水剂的使用,并减轻开采 REE 对环境的影响.
相关概念视频
The Sulfur Cycle
44.1K
Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
44.1K
The Phosphorus Cycle
36.8K
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.
36.8K
The Periodic Table and Organismal Elements
16.8K
Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
Periodic Table Provides Information...
Periodic Table Provides Information...
16.8K
Water and Mineral Acquisition
33.0K
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
33.0K


