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Related Concept Videos

UV–Vis Spectroscopy: Beer–Lambert Law01:09

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The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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UV–Vis Spectrometers01:14

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the...
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UV-VIS absorption spectroscopy: Lambert-Beer reloaded.

Werner Mäntele1, Erhan Deniz1

  • 1Institut für Biophysik, Johann Wolfgang Goethe-Universität Frankfurt am Main, Max-von Laue-Straße 1, D-60438 Frankfurt am Main, Germany.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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Summary

This tutorial explains the limitations of the Lambert-Beer Law in UV-VIS absorption spectroscopy. Learn simple rules to avoid common problems caused by technical limits and experimental choices.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy

Background:

  • UV-VIS absorption spectroscopy is a fundamental technique in analytical laboratories.
  • The Lambert-Beer Law is the cornerstone of quantitative analysis using UV-VIS spectroscopy.

Discussion:

  • This tutorial addresses common issues encountered in routine UV-VIS spectroscopy.
  • Problems arise from technical limitations and suboptimal experimental parameter selection.
  • Understanding these limitations is crucial for accurate spectroscopic analysis.

Key Insights:

  • Many users are unaware of the Lambert-Beer Law's limitations.
  • Careless experimental design can lead to significant analytical errors.
  • Simple guidelines are provided to mitigate these common spectroscopic problems.

Outlook:

  • Improved awareness of spectroscopic limitations enhances data reliability.
  • Adherence to best practices ensures more accurate routine analysis.
  • This tutorial serves as a guide for spectroscopists to overcome practical challenges.