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Precipitation and Co-precipitation

Precipitation and Co-precipitation

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...

Precipitation Processes

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...

Types of Coprecipitation

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.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...

Precipitation of Ions

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:

Precipitate Formation and Particle Size Control

Precipitate Formation and Particle Size Control

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...

Precipitation Gravimetry

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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Simulating Impacts of Ice Storms on Forest Ecosystems

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Significant Amplification of Instantaneous Extreme Precipitation With Convective Self-Aggregation.

Nicolas A Da Silva¹, Caroline Muller², Sara Shamekh³

¹Complexity and Climate, Leibniz Centre for Tropical Marine Research Bremen Germany.

Journal of Advances in Modeling Earth Systems

|July 21, 2022

Summary

Convective self-aggregation significantly increases instantaneous rainfall rates by enhancing precipitation efficiency and microphysics. This organization impacts tropical precipitation extremes differently than expected, highlighting the need for further research in a warming climate.

Keywords:

convection microphysics precipitation extremes self‐aggregation

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Area of Science:

Atmospheric Science
Climate Science
Meteorology

Background:

Convective self-aggregation, the tendency for convection to organize into moist and dry regions, is a key process influencing tropical climate.
Understanding its impact on extreme rainfall is crucial for climate projections.

Purpose of the Study:

To investigate the effect of convective self-aggregation on extreme rainfall intensities across different cloud lifecycle stages.
To analyze the underlying mechanisms driving changes in precipitation efficiency and microphysics.

Main Methods:

Analysis of extreme rainfall intensities at various cloud lifecycle stages.
Application of a recent framework to link rainfall increase to precipitation efficiency.
In-depth analysis using adapted scaling for precipitation extremes.

Main Results:

Instantaneous rain rates increased by 30% with convective self-aggregation.
Dynamic contribution to extremes decreased (-25%), while thermodynamic contribution slightly increased (+5%).
Microphysical contribution increased by 50%, driven by reduced evaporation and enhanced accretion efficiency.

Conclusions:

Convective self-aggregation alters tropical precipitation extremes beyond thermodynamic predictions.
Changes in convective organization regimes may lead to significant shifts in rainfall extremes.
Further research on self-aggregation is vital for accurate rainfall projections in a warming climate.