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Precipitation Gravimetry01:03

Precipitation Gravimetry

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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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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

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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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Individual molecules in a gas move in random directions, but a gas containing numerous molecules has a predictable distribution of molecular speeds, which is known as the Maxwell-Boltzmann distribution, f(v).
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Types of Coprecipitation01:10

Types of Coprecipitation

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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.
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Extraction: Partition and Distribution Coefficients

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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
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Expanding the Goddard CSH Algorithm for GPM: New Extratropical Retrievals.

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New look-up tables (LUTs) improve latent heating (LH) retrieval for the Global Precipitation Measurement (GPM) mission in high-latitude and winter conditions. This enhances climate modeling and weather forecasting accuracy.

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Area of Science:

  • Atmospheric Science
  • Remote Sensing
  • Climate Modeling

Background:

  • The Goddard Convective-Stratiform Heating (CSH) algorithm uses cloud-resolving models (CRMs) and look-up tables (LUTs) to retrieve latent heating (LH).
  • Current CSH algorithm LUTs are inadequate for high-latitude and winter conditions crucial for the Global Precipitation Measurement (GPM) mission.

Purpose of the Study:

  • To develop and validate new LUTs for accurate LH profile retrieval in high-latitude/winter conditions for the GPM mission.
  • To improve the CSH algorithm's applicability to diverse climate zones and seasons.

Main Methods:

  • Utilized the NASA Unified-Weather Research and Forecasting (NU-WRF) model to simulate winter precipitation events in the US.
  • Established a new classification system based on precipitation properties (e.g., radar reflectivity, freezing level height) to create updated LUTs.
  • Performed self-consistency checks comparing retrieved LH profiles with model-simulated data.

Main Results:

  • The new classification system and LUTs were validated through self-consistency checks for continental US and West Coast events.
  • The updated LUTs demonstrated improved performance for high-latitude and winter conditions.
  • Successfully merged new high-latitude retrievals with existing CSH algorithm data.

Conclusions:

  • The developed LUTs enhance the retrieval of latent heating profiles in challenging high-latitude and winter environments.
  • This advancement supports more accurate climate research and weather prediction under the GPM mission.
  • The study provides a pathway for improved global precipitation and heating estimations.