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Updated: Jul 22, 2025

Extraction and Characterization of Surfactants from Atmospheric Aerosols
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Published on: April 21, 2017

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在多个活动中,船只和飞机对海云凝结核和滴滴度的观测

Kevin J Sanchez1, David Painemal2,3, Matthew D Brown2,3

  • 1NASA Langley Research Center, Hampton, VA, 23681, USA. kevin.j.sanchez@nasa.gov.

Scientific data
|July 20, 2023
PubMed
概括

这项研究汇总了来自七个现场活动的海洋云数据,以改进云滴和凝结核度的卫星遥感. 这有助于我们更好地了解远程海洋地区的气溶与云的相互作用.

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Precipitation and Co-precipitation

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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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Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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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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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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