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Gravimetry: Inorganic And Organic Precipitating Agents00:49

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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...

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Area of Science:

  • Planetary Science
  • Lunar Geology
  • Geochemistry

Background:

  • Understanding lunar evolution requires detailed surface chemistry.
  • Previous chemical mapping was limited to older lunar periods (pre-3.0 Gyr).
  • The critical late period of lunar evolution remains under-mapped.

Purpose of the Study:

  • To create precise major oxides chemistry maps of the lunar surface.
  • To extend chemical mapping to the younger, 2.0 Gyr period of lunar history.
  • To identify potential future sample return mission sites.

Main Methods:

  • Integration of Chang'e-5 lunar soil samples (2.0 Gyr) with a deep learning inversion model.
  • Generation of major oxides chemistry maps.
  • Verification using Chang'e 3 and Chang'e 4 in situ measurement data.

Main Results:

  • Inferred chemical contents show higher precision than Lunar Prospector Gamma-Ray Spectrometer (GRS) maps.
  • Results closely match returned sample abundances, serving as crucial ground truth.
  • Identification of young mare basalt units.

Conclusions:

  • Chang'e-5 samples are vital for accurate lunar surface chemistry mapping.
  • The new maps provide unprecedented detail for the late lunar period.
  • Identified young mare basalts are promising targets for future missions to study lunar magmatic and thermal history.