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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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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...
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相关实验视频

Updated: May 22, 2025

Dissolved Solute Sampling Across an Oxic-Anoxic Soil-Water Interface Using Microdialysis Profilers
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在中国各地的地下水质量演变.

Qing Zhou1,2, Jiangjiang Zhang3,4, Shuyou Zhang1,2,5

  • 1Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China.

Nature communications
|March 14, 2025
PubMed
概括
此摘要是机器生成的。

中国中国中国中国.

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Watershed Planning within a Quantitative Scenario Analysis Framework
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科学领域:

  • 环境科学 环境科学
  • 水资源管理 水资源管理
  • 机器学习应用 机器学习应用

背景情况:

  • 中国面临着与经济发展和气候变化有关的严重地下水质量危机.
  • 这场危机的全部程度和未来的发展轨迹尚不清楚.
  • 在中国,地下水质量对于饮用水和农业至关重要.

研究的目的:

  • 开发一种机器学习模型,在中国各地绘制低质量地下水 (PGQ) 地图.
  • 分析PGQ从1980年到2100年的历史趋势和未来预测.
  • 确定导致地下水质量恶化的关键驱动因素.

主要方法:

  • 开发了一种整合自然和社会经济因素的机器学习模型.
  • 构建了地下水质量差的年度概率地图 (V类).
  • 分析了历史数据 (1980-2020年) 和预测的未来情景 (到2100年).

主要成果:

  • 糟糕的地下水质量 (PGQ) 面积比率从1980年的17.3%增加到2020年的40.8%,影响了超过36%的人口.
  • 农业排放是主要的驱动因素,其次是地下水利用和工业排放.
  • 未来的PGQ面积比率预测2050年范围从37.9%到48.3%.

结论:

  • 迫切需要有效的水资源管理和保护战略.
  • 缓解地下水退化对于中国和全球的水安全至关重要.
  • 必须解决社会经济发展和气候变化对水资源的影响.