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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

5.3K
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...
5.3K
Precipitation Gravimetry01:03

Precipitation Gravimetry

14.4K
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...
14.4K
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
Precipitation of Ions03:11

Precipitation of Ions

29.9K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
29.9K
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

5.7K
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...
5.7K
Types of Coprecipitation01:10

Types of Coprecipitation

5.5K
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...
5.5K

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Decoding global precipitation processes and particle evolution using unsupervised learning.

Fraser King1, Claire Pettersen1, Brenda Dolan2

  • 1Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA.

Science Advances
|September 19, 2025
PubMed
Summary

Scientists used Uniform Manifold Approximation and Projection (UMAP) to analyze over 1.5 million hydrometeor observations. This method identified nine distinct precipitation groups, improving weather and climate model evaluation and precipitation estimates.

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Area of Science:

  • Atmospheric Science
  • Meteorology
  • Climate Science

Background:

  • High-quality hydrometeor microphysical observations are crucial for accurate precipitation estimates.
  • Analyzing hydrometeor properties is challenging due to high variability, complex interactions, and large data volumes.

Purpose of the Study:

  • To analyze a large dataset of hydrometeor microphysical properties and meteorological variables.
  • To identify distinct precipitation groups and particle evolution pathways using nonlinear dimensionality reduction.
  • To improve the evaluation of weather and climate models and precipitation estimation techniques.

Main Methods:

  • Utilized over 1.5 million minute-scale rain and snow particle attributes from seven global sites over 9 years.
  • Applied Uniform Manifold Approximation and Projection (UMAP) for nonlinear dimensionality reduction.
  • Reduced dataset dimensionality by 75% to identify underlying patterns.

Main Results:

  • Identified nine distinct precipitation groups, including rain, snow, and mixed-phase types.
  • UMAP effectively captured the global structure of precipitation phases, revealing patterns missed by linear methods.
  • The UMAP manifold provided a unique perspective on precipitation phase and intensity.

Conclusions:

  • UMAP is an effective tool for analyzing complex hydrometeorological data.
  • The identified precipitation groups and pathways advance understanding of particle evolution.
  • Findings offer valuable insights for improving weather/climate models and remote sensing precipitation estimates.