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Buffers

Buffers

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...

Buffers: Buffer Capacity

Buffers: Buffer Capacity

Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak...

Buffer Effectiveness

Buffer Effectiveness

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...

The Phosphorus Cycle

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.

Calculating pH Changes in a Buffer Solution

Calculating pH Changes in a Buffer Solution

A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...

Buffers: Overview

Buffers: Overview

Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. 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 (aq).

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Related Experiment Video

Updated: Jan 26, 2026

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

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

Published on: March 6, 2014

Management Options to Reduce Phosphorus Leaching from Vegetated Buffer Strips.

Sandra Hille, Daniel Graeber, Brian Kronvang

Journal of Environmental Quality

|April 6, 2019

Summary

This summary is machine-generated.

Harvesting vegetated buffer strips (VBS) effectively reduces phosphorus (P) accumulation and leaching risk into surface waters. Annual harvesting is most economical, offering a practical solution for managing P saturation in agricultural buffer zones.

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Area of Science:

Environmental Science
Soil Science
Water Quality Management

Background:

Vegetated buffer strips (VBS) accumulate eroded phosphorus (P), leading to high P saturation and increased leaching risk into surface waters.
Agricultural runoff contributes significantly to P loading in aquatic ecosystems, impacting water quality.

Purpose of the Study:

To evaluate the effectiveness of harvesting natural buffer vegetation in reducing P accumulation and leaching from VBS.
To compare the impact of topsoil removal versus different harvesting frequencies on soil P levels and leaching potential.

Main Methods:

A numerical time-step model was used to simulate changes in VBS soil P levels under different management scenarios.
Simulations included topsoil removal and harvesting vegetation at frequencies of once, twice, or four times per year.

Main Results:

Harvesting VBS vegetation effectively reduced soil P content, offsetting erosional P deposition and lowering the risk of P leaching.
Annual harvesting was found to be the most economical frequency, with marginal differences in P removal compared to more frequent harvesting.
Topsoil removal showed limited effectiveness in reducing P leaching at most sites.

Conclusions:

Vegetation harvesting is a practical and efficient management strategy to reduce P leaching from agricultural VBS.
Harvesting helps mitigate P saturation in VBS soils, reducing the risk of soluble P entering surface waters.
Long-term P reduction in VBS soils may require substantial time, but harvesting offers immediate benefits for P management.