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Related Concept Videos

Solvents01:12

Solvents

67.6K
A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
67.6K
Expressing Solution Concentration02:48

Expressing Solution Concentration

61.4K
A solute is a component of a solution that is typically present at a much lower concentration than the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
Concentrations may be quantitatively assessed using a wide variety of measurement units, each convenient for particular applications. Molarity (M) is a useful concentration unit for many applications in chemistry.
61.4K
Composition of Body Fluids01:29

Composition of Body Fluids

942
Water functions as a solvent accommodating various solutes, which can be categorized under electrolytes and non-electrolytes. Non-electrolytes are usually held together by covalent bonds, restricting them from dissociating in solution, thereby leading to a lack of electrically charged components upon dissolving in water. They are predominantly organic molecules, such as glucose, creatinine, and urea. Electrolytes, on the other hand, are compounds that can break down into ions in water.
942
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

2.2K
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...
2.2K
Solution Equilibrium and Saturation01:59

Solution Equilibrium and Saturation

19.7K
Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
19.7K
Solubility Equilibria: Overview01:09

Solubility Equilibria: Overview

929
When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
Solubility is important in biological and environmental processes. A notable...
929

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Wastewater Irrigation Impacts on Soil Hydraulic Conductivity: Coupled Field Sampling and Laboratory Determination of Saturated Hydraulic Conductivity
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Global Groundwater Solute Composition and Concentrations.

Warren W Wood1, Pauline L Smedley2, Bruce D Lindsey3

  • 1Department of Earth and Environmental Sciences, Michigan State University, 206 Natural Sciences Building, 288 Farm Lane, East Lansing, MI, 48824, USA.

Ground Water
|May 4, 2022
PubMed
Summary
This summary is machine-generated.

This study quantifies global groundwater solute concentrations using machine learning, providing crucial data for understanding element cycling and its impact on climate change and human health.

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Area of Science:

  • Geochemistry
  • Hydrology
  • Environmental Science

Background:

  • Accurate analysis of global policies on food security, climate change, and human health requires quantitative estimates of solute mass fluxes.
  • Global aquifer systems represent a significant, yet enigmatic, global element pool crucial for Earth's systems.

Purpose of the Study:

  • To provide the first quantitative estimates of mean global solute concentrations in active groundwater.
  • To establish a comprehensive database for major, minor, and trace solutes in Earth's groundwater.

Main Methods:

  • Utilized a geospatial machine learning kNN-nearest neighbors' algorithm.
  • Employed numerous geospatial predictors including lithology, climate, aquifer age, and elevation.
  • Developed a large, novel solute database for groundwater analysis.

Main Results:

  • Presented mean global solute concentrations for major, minor, and trace elements in active groundwater.
  • The results are consistent with traditional geochemical indicators like solute ratios and saturation indices.
  • Groundwater, representing 99% of Earth's liquid fresh water, has yielded its solute profile.

Conclusions:

  • This research offers a foundational dataset for understanding global element cycling through groundwater.
  • The findings support informed policy analysis concerning environmental nutrient flux, human health, and climate change.
  • The application of machine learning provides a powerful new approach to characterizing global geochemical systems.