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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

5.1K
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...
5.1K
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

5.6K
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...
5.6K
Types of Coprecipitation01:10

Types of Coprecipitation

5.4K
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.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
5.4K
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

4.0K
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...
4.0K
Colloidal precipitates01:09

Colloidal precipitates

5.2K
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...
5.2K
Boundary Layer Characteristics01:18

Boundary Layer Characteristics

563
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...
563

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Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
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Microfibers Accumulation within a Mediterranean Submesoscale Cyclone.

Giovanni Testa1,2, Giuseppe Suaria3, Andrea Paluselli3

  • 1Institute of Marine Sciences, National Research Council (CNR-ISMAR), Venice 30122, Italy.

Environmental Science & Technology
|January 14, 2026
PubMed
Summary
This summary is machine-generated.

Submesoscale cyclones trap textile microfibers (MFs) in the Mediterranean Sea, creating hotspots of pollution. These ocean features act as temporary reservoirs for microplastics, impacting marine ecosystems.

Keywords:
Mediterranean Seabiological hotspotmarine contaminantsmicrofibers retentionmicroplasticssubmesoscale cyclone

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Area of Science:

  • Oceanography
  • Marine pollution
  • Microplastic research

Background:

  • Cyclonic eddies are known to enhance primary productivity through nutrient upwelling.
  • The role of these eddies in transporting and retaining anthropogenic contaminants is not well understood.
  • Microplastic pollution, particularly textile microfibers (MFs), is a growing concern in marine environments.

Purpose of the Study:

  • To investigate the role of submesoscale cyclones in the accumulation and transport of textile microfibers.
  • To understand the relationship between oceanographic features and microplastic distribution.
  • To assess the potential impact of contaminant retention by eddies on marine ecosystems.

Main Methods:

  • High-resolution oceanographic measurements were collected from a submesoscale cyclone in the Western Mediterranean Sea.
  • Concentrations of textile microfibers (MFs) were quantified within the eddy core and surrounding waters.
  • Chlorophyll-a concentrations were measured to assess biological response to physical forcing.

Main Results:

  • A significant accumulation of textile microfibers (MFs) was observed in the subsurface eddy core (0.34 MF l-1) compared to surrounding waters (0.09 MF l-1).
  • This microfiber enrichment persisted in a smaller, detached cyclone.
  • Elevated chlorophyll-a concentrations indicated a coupled biological response to the eddy's physical dynamics.

Conclusions:

  • Submesoscale cyclones can act as transient reservoirs for anthropogenic contaminants like microfibers.
  • The findings highlight the importance of oceanographic features in the distribution and fate of marine pollutants.
  • This research has implications for understanding pollutant exposure pathways and trophic transfer in marine ecosystems.