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Related Concept Videos

Boundary Layer Characteristics01:18

Boundary Layer Characteristics

766
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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Precipitation Processes01:12

Precipitation Processes

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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 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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Precipitation Gravimetry01:03

Precipitation Gravimetry

15.9K
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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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

6.2K
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
6.2K
The Colloidal State01:29

The Colloidal State

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
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Amazon boundary layer aerosol concentration sustained by vertical transport during rainfall.

Jian Wang1, Radovan Krejci2, Scott Giangrande1

  • 1Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, USA.

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Atmospheric vapours nucleate new aerosol particles. In the Amazon, precipitation transports these particles from the free troposphere into the boundary layer, influencing cloud properties.

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Area of Science:

  • Atmospheric Science
  • Aerosol Science
  • Cloud Physics

Background:

  • Atmospheric vapour nucleation forms new aerosol particles, crucial for cloud condensation nuclei (CCN).
  • Continental aerosol studies are often influenced by anthropogenic sources, leaving pristine environments understudied.
  • The Amazon rainforest offers a unique setting to study near-natural aerosol processes.

Purpose of the Study:

  • To investigate the origin of small aerosol particles in the Amazon boundary layer.
  • To understand the processes that maintain particle populations influencing cloud formation in a pristine environment.

Main Methods:

  • Aircraft- and ground-based measurements conducted in the central Amazon basin during the wet season.
  • Focus on aerosol particle concentrations and vertical transport mechanisms under clean atmospheric conditions.

Main Results:

  • High concentrations of small aerosol particles (diameter < 50 nm) were observed in the lower free troposphere.
  • Precipitation events, including convective downdrafts and stratiform region downdrafts, were identified as key transport mechanisms.
  • These processes move particles from the free troposphere into the Amazon boundary layer.

Conclusions:

  • Rapid vertical transport of aerosol particles during precipitation events sustains particle populations in the Amazon boundary layer.
  • This mechanism is vital for understanding aerosol-cloud interactions and climate regulation in natural terrestrial environments.
  • Findings highlight the importance of pristine environments for studying fundamental atmospheric processes.