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Related Concept Videos

The Phosphorus Cycle01:21

The Phosphorus Cycle

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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.
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Phosphate Buffer01:22

Phosphate Buffer

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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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Buffers02:56

Buffers

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A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
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Factors Affecting Solubility04:01

Factors Affecting Solubility

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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:
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Buffer Effectiveness02:19

Buffer Effectiveness

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Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...
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Buffer Systems in the Body01:19

Buffer Systems in the Body

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Chemical buffers play a critical role in the body's regulation of pH levels. These systems contain one or more compounds that stabilize pH changes by neutralizing strong acids or bases. When pH levels drop, hydrogen ions bind to a weak base; when pH levels rise, hydrogen ions are released. This dynamic process helps maintain pH within a narrow and stable range essential for normal physiological function.
A typical buffer system in bodily fluids includes a weak acid and its corresponding...
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Related Experiment Video

Updated: Nov 20, 2025

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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Sediment phosphorus buffering in streams at baseflow: A meta-analysis.

Zachary P Simpson1, Richard W McDowell1,2, Leo M Condron1

  • 1Faculty of Agriculture and Life Sciences, Lincoln Univ., P.O. Box 84, Lincoln, Christchurch, 7647, New Zealand.

Journal of Environmental Quality
|January 25, 2021
PubMed
Summary

Sediments often release or absorb phosphorus (P), rarely reaching equilibrium with streamwater. Understanding sediment P buffering is key to managing aquatic P pollution and eutrophication.

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Area of Science:

  • Environmental Science
  • Aquatic Chemistry
  • Water Quality Management

Background:

  • Phosphorus pollution is a major threat to surface water quality.
  • Understanding factors controlling phosphorus (P) concentrations in streams is crucial.
  • The sediment P buffer plays a significant role in regulating streamwater P.

Purpose of the Study:

  • To synthesize literature on the sediment P buffer's control on stream P concentrations.
  • To conduct a global meta-analysis of sediment equilibrium phosphate concentration (EPC0).
  • To understand streamwater-sediment P interactions at baseflow.

Main Methods:

  • Global meta-analysis of 45 studies with >900 paired observations of dissolved reactive P (DRP) and EPC0.
  • Analysis of factors moderating P exchange, including sediment and stream characteristics.
  • Evaluation of methodological influences on EPC0 determination.

Main Results:

  • Sediments rarely reach equilibrium with streamwater, frequently having the potential to remove or release P (83% of observations).
  • P exchange potential is influenced by sediment properties (sorption affinity, pH, P concentration, particle size) and stream conditions.
  • Other factors like hydrology, sediment surface chemistry, hyporheic exchange, and biota affect P exchange realization.

Conclusions:

  • Sediments are dynamic P buffers, but equilibrium is uncommon.
  • Understanding sediment P dynamics is vital for effective management of P pollution and eutrophication.
  • Standardized measurement and reporting of EPC0 are needed for improved inter-study comparison and application.