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Updated: May 13, 2025

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在北美东部中度地区的全新纪湿度变化模式和驱动因素

J Sakari Salonen1, Frederik Schenk2,3,4, John W Williams5

  • 1Department of Geosciences and Geography, University of Helsinki, Helsinki, Finland. sakari.salonen@helsinki.fi.

Nature communications
|April 15, 2025
PubMed
概括

全新纪气候数据显示,北美东部地区持续出现干旱. 气候模型现在与代理数据保持一致,将这些干旱时期归因于阳光照射,冰盖融化和气候变暖驱动的蒸发.

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Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Types of Coprecipitation

Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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