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Related Concept Videos

Spectrophotometry: Introduction01:16

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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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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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
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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...
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Standard solutions refer to solutions with a precisely known concentration or composition. A primary standard is a highly pure, high molar mass, stable substance that is entirely soluble in water, the most commonly used solvent in analytical chemistry. The primary standard solution can be used to standardize secondary standards, which are substances with known concentrations but are less pure and stable. Standard solutions are essential for achieving accurate and reliable results in analytical...
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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...
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Spectrophotometric Standards.

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Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|September 27, 2021
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Summary
This summary is machine-generated.

Accurate spectrophotometric measurements require comparing radiation fluxes within defined geometries. This program aims to establish this standard for practical, believable scientific measurements.

Keywords:
Photometric accuracyspectrophotometricstandards

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Area of Science:

  • Physics
  • Metrology

Background:

  • Spectrophotometric measurements are crucial for scientific applications.
  • The reliability of these measurements depends on accurate flux comparisons.
  • A well-defined geometric framework is essential for believability.

Purpose of the Study:

  • To establish a fundamental standard for believable spectrophotometric measurements.
  • To develop the ability to accurately compare radiation fluxes.
  • To support practical measurement applications across a broad range.

Main Methods:

  • Focus on developing accurate radiation flux comparisons.
  • Emphasis on establishing a well-defined geometric framework.
  • Broadening the scope of spectrophotometric measurement capabilities.

Main Results:

  • A foundational standard for spectrophotometric measurements is proposed.
  • The ability to compare radiation fluxes with accuracy is being developed.
  • The program aims for broad applicability in practical measurements.

Conclusions:

  • Establishing accurate flux comparison within defined geometries is key to useful spectrophotometry.
  • The proposed program at the Institute for Basic Standards will enhance measurement reliability.
  • This work will assist the National Bureau of Standards in supporting practical measurement challenges.