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Related Concept Videos

The Phosphorus Cycle01:21

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
Phosphorylation01:02

Phosphorylation

The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
Primary Production01:06

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Factors Affecting Solubility04:01

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
Phosphate Buffer01:22

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...

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Related Experiment Video

Updated: May 12, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
10:49

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

Phosphorous control in a eutrophied reservoir.

H Márquez-Pacheco1, A M Hansen, A Falcón-Rojas

  • 1Instituto Mexicano de Tecnología del Agua (IMTA), Paseo Cuauhnáhuac 8532, Jiutepec, 62550, Mor, Mexico.

Environmental Science and Pollution Research International
|April 17, 2013
PubMed
Summary

Phoslock effectively reduces phosphorus concentrations in eutrophic waters, aiding in lake restoration. Periodic reapplication is recommended unless external phosphorus loads are significantly reduced.

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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

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Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
08:21

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Published on: May 18, 2018

Related Experiment Videos

Last Updated: May 12, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
10:49

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
06:42

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
08:21

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Published on: May 18, 2018

Area of Science:

  • Environmental Chemistry
  • Limnology
  • Water Resource Management

Background:

  • Eutrophication is driven by phosphorus (P) from external loads (EPL) and internal loads (IPL) from sediments.
  • Algal blooms and anoxia persist post-EPL control due to significant IPL.
  • Effective management strategies are crucial for restoring eutrophic water bodies.

Purpose of the Study:

  • To evaluate Phoslock's efficacy in reducing water P concentrations and immobilizing sediment-bound P.
  • To develop a model for determining Phoslock dosage and application frequency in reservoirs.
  • To assess the impact of EPL reduction on long-term P control strategies.

Main Methods:

  • Mesocosm trials were conducted in a eutrophic reservoir using Phoslock.
  • A model was developed and applied to predict adsorbent requirements for P control.
  • Phoslock's ability to reduce P to mesotrophic levels and immobilize releasable P was assessed.

Main Results:

  • Phoslock rapidly reduced P concentrations to mesotrophic levels within two weeks.
  • Mesocosm trials confirmed Phoslock's effectiveness in immobilizing releasable P from sediments.
  • Modeling indicated periodic Phoslock reapplication is needed unless EPL is reduced by 36%.

Conclusions:

  • Phoslock is an effective tool for rapidly decreasing P levels in eutrophic waters.
  • A 36% reduction in EPL is necessary for sustained P control without continuous Phoslock use.
  • The developed model aids in planning P remediation actions in lakes and reservoirs.