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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.
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Geographic Information Systems (GIS) operate across three levels of application, each representing an increasing degree of complexity: data management, analysis, and prediction. These levels reflect the expanding functionality and versatility of GIS technology in handling spatial data for diverse purposes.Data ManagementAt its foundational level, GIS serves as a tool for data management, enabling the input, storage, retrieval, and organization of spatial data. This level is often employed in...
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Leveling is a surveying procedure used to determine elevation differences between distant points. Elevation refers to the vertical distance above or below a reference datum, typically mean sea level (MSL). In the United States, elevations are often referenced to the mean sea level station at Father Point Rimouski along the St. Lawrence Seaway. To make the datum accessible, permanent markers are established throughout the region. These markers, called benchmarks, have known elevations. If the...
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Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
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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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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.
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Development of Groundwater Levels Dataset for Chile since 1970.

Héctor Leopoldo Venegas-Quiñones1, Rodrigo Valdés-Pineda2,3,4, Pablo García-Chevesich5,6

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Summary

Chile now has a unified, quality-controlled groundwater dataset covering 1970-2021. This crucial resource supports sustainable water management and research by providing reliable spatio-temporal groundwater level data.

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Area of Science:

  • Hydrology
  • Environmental Science
  • Data Science

Background:

  • Accurate spatio-temporal groundwater level data is vital for sustainable water management in Chile.
  • Existing data limitations, including a lack of unified and quality-controlled datasets, have impeded large-scale groundwater research.

Purpose of the Study:

  • To establish a comprehensive, reliable, and quality-controlled nationwide groundwater dataset for Chile.
  • To enhance groundwater studies by incorporating elevation data for improved groundwater elevation estimation.

Main Methods:

  • Curation of over 120,000 groundwater level records from 640 wells (1970-2021).
  • Integration of well elevation data into the dataset.
  • Implementation of a rigorous data quality analysis using a classification scheme for raw records.

Main Results:

  • Development of a unified, nationwide groundwater dataset spanning five decades.
  • Inclusion of elevation data enabling more accurate groundwater elevation calculations.
  • A quality-controlled dataset ready for extensive research and analysis.

Conclusions:

  • The created dataset addresses a critical gap in Chilean water resource management.
  • This reliable resource empowers researchers and decision-makers with insights into groundwater trends.
  • The dataset is instrumental in supporting informed and sustainable water management strategies in Chile.