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Gravimetry: Overview01:05

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Gravimetric analysis is a quantitative method where the analyte is isolated and weighed directly or after conversion into a substance of known composition. Gravimetric analysis can be classified as precipitation, electrogravimetry, volatilization, and particulate gravimetry, based on the method used to isolate the analyte.
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
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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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Related Experiment Video

Updated: Sep 1, 2025

Dissolved Solute Sampling Across an Oxic-Anoxic Soil-Water Interface Using Microdialysis Profilers
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Multivariate statistics explaining groundwater chemistry, Asyut, Egypt.

Ibrahim Said1, Amr N Abd-Elgawad2, El-Montser M Seleem3

  • 1Geological Sciences Dept, National Research Centre, Dokki, Giza, Egypt. hemanrc@gmail.com.

Environmental Monitoring and Assessment
|August 13, 2022
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Summary

Groundwater in Asyut shows varied quality due to pollution and natural processes. Management is key to protect this vital resource for domestic and irrigation use.

Keywords:
Anthropogenic influenceGroundwaterMultivariate statistics

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Area of Science:

  • Hydrogeology
  • Environmental Science
  • Geochemistry

Background:

  • Groundwater is crucial for domestic and irrigation needs in the Asyut region.
  • Water quality is highly variable, influenced by complex geochemical interactions and pollution.
  • Understanding groundwater chemistry is vital for addressing water quality issues.

Purpose of the Study:

  • To investigate the geochemical processes controlling groundwater chemistry in Asyut.
  • To differentiate between natural and anthropogenic influences on groundwater quality.
  • To inform the development of a sustainable groundwater management plan.

Main Methods:

  • Multivariate statistical analysis of hydrochemical data.
  • Assessment of geochemical processes including mineralization, redox conditions, and evaporation.
  • Evaluation of pollution sources such as agricultural runoff and pipe corrosion.

Main Results:

  • Groundwater chemistry is significantly impacted by anthropogenic recharge (agricultural/organic pollution), mineralization, and redox processes.
  • Shallow wells exhibit higher bicarbonate, iron, and manganese levels, linked to organic pollutant oxidation and pipe corrosion.
  • Groundwater mineralization increases towards desert fringes due to lithology and hydrogeology, exacerbated by evaporation.

Conclusions:

  • Both natural and anthropogenic factors contribute to groundwater quality variations.
  • Nitrogen fertilization impacts natural weathering processes.
  • Effective groundwater management strategies are necessary to protect the Asyut aquifer from contamination and over-mineralization.