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Related Concept Videos

Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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Colloids and Suspensions01:17

Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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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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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Precipitation Processes01:12

Precipitation Processes

5.0K
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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Decrease in Nucleated Particles and Cloud Condensation Nuclei Observed across a Range of Environments.

Do-Hyeon Park1,2, Paolo Laj3,4, Elisabeth Andrews5,6

  • 1School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea.

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Summary
This summary is machine-generated.

New particle formation (NPF) and nanoparticle concentrations are declining, especially in urban areas. This trend suggests reduced anthropogenic emissions may impact climate forcing via aerosol-cloud interactions.

Keywords:
aerosol−cloud interactionsair quality regulationscloud condensation nucleinew particle formationparticle number size distribution

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Area of Science:

  • Atmospheric Science
  • Climate Science
  • Environmental Science

Background:

  • New particle formation (NPF) and nanoparticle fate are critical for air quality, cloud formation, and climate.
  • Aerosol sources and short atmospheric lifetimes cause spatial and temporal variations in these effects.

Purpose of the Study:

  • To analyze long-term trends in NPF-associated nucleation-mode particles and cloud condensation nuclei (CCN) concentrations.
  • To investigate the relationship between NPF, CCN, and potential climate forcing implications.

Main Methods:

  • Utilized quality-controlled particle number size distribution (PNSD) and CCN data from 37 Global Atmosphere Watch (GAW) stations.
  • Performed comprehensive analysis of decadal trends across diverse observation environments.

Main Results:

  • Identified declining decadal trends in NPF occurrences and nucleated particle concentrations at most sites, with urban areas showing the strongest declines.
  • Observed simultaneous reductions in both CCN and nucleation-mode particle concentrations.
  • Found that newly formed particles are a potential source of CCN, linking NPF to cloud droplet formation.

Conclusions:

  • Decreasing anthropogenic emissions may indirectly influence climate forcing through aerosol-cloud interactions.
  • Changes in NPF and particle concentrations have significant implications for future climate projections and aerosol-cloud interactions.