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Difference from Background: Limit of Detection

Difference from Background: Limit of Detection

The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...

Leveling Effect

Leveling Effect

In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...

Solution Concentration and Dilution

Solution Concentration and Dilution

The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...

Leveling Effect and Non-Aqueous Acid-Base Solutions

Leveling Effect and Non-Aqueous Acid-Base Solutions

This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):

Titration of a Weak Acid with a Weak Base

Titration of a Weak Acid with a Weak Base

Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
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Acid/Base Strengths and Dissociation Constants

Acid/Base Strengths and Dissociation Constants

The relative strength of an acid or base is the extent to which it ionizes when dissolved in water. If the ionization reaction is essentially complete, the acid or base is termed strong; if relatively little ionization occurs, the acid or base is weak. There are many more weak acids and bases than strong ones. The most common strong acids and bases are listed below:

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Related Experiment Video

Updated: May 23, 2026

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

Published on: December 2, 2017

Dilution and the elusive baseline.

Gene E Likens¹, Donald C Buso

¹Cary Institute of Ecosystem Studies, Millbrook, New York 12545, United States. LikensG@ecostudies.org

Environmental Science & Technology

|March 30, 2012

Summary

This summary is machine-generated.

Surface waters in New Hampshire are rapidly diluting due to acid deposition, threatening ecosystems. This trend suggests demineralized water conditions within decades, impacting aquatic life and water resources.

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Last Updated: May 23, 2026

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

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Published on: December 2, 2017

Automated Acoustic Dispensing for the Serial Dilution of Peptide Agonists in Potency Determination Assays

Automated Acoustic Dispensing for the Serial Dilution of Peptide Agonists in Potency Determination Assays

Published on: November 10, 2016

Area of Science:

Environmental Science
Ecology
Hydrology

Background:

Baseline environmental conditions are crucial for assessing human impacts like acid deposition.
Ecosystem restoration requires targets based on historical or unknown baseline conditions.

Purpose of the Study:

To investigate the long-term trends in surface water chemistry in response to acid deposition.
To project future water chemistry conditions and compare them to theoretical baseline compositions.

Main Methods:

Analysis of a 47-year dataset of precipitation and streamwater chemistry from the Hubbard Brook Experimental Forest (HBEF).
Extrapolation of linear trends to predict future water chemistry.
Calculation of theoretical baseline compositions for precipitation and streamwater.

Main Results:

Significant and rapid dilution of surface water chemistry observed in the White Mountains, NH.
Projected demineralized water conditions within 10-30 years, with high correlation (r(2) >0.84) since 1985.
Calculated theoretical baseline values (e.g., conductivity, base cation concentration, ANC, pH) are more dilute than Pre-Industrial Revolution (PIR) conditions.

Conclusions:

Acid deposition has led to extreme dilution of surface waters, surpassing theoretical pristine levels.
These changes have significant implications for aquatic organisms, biogeochemical cycles, and water resource management.
Understanding these trends is vital for effective ecosystem management and restoration efforts.