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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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. Samples for...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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 electronic transitions. As a result...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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.
One of the factors influencing λmax is the extent of conjugation in the...
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

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 contributions...
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

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.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

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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UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media
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UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media

Published on: October 25, 2021

[A novel technology for water quality testing based on UV spectral analysis].

You-quan Zhao1, Yu-chun Li, Yi Guo

  • 1Tianjin Key Laboratory of Biomedical Detecting Techniques & Instruments, College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China. zhaoyouquan@tju.edu.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|July 26, 2012
PubMed
Summary

This study introduces a portable UV-visible spectroscopy system for real-time water quality testing. The system accurately measures chemical oxygen demand (COD) and other indices, enabling efficient water pollution control.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Effective water pollution control necessitates real-time, online, and portable water quality testing methods.
  • Existing methods may lack the speed, portability, or comprehensive analysis required for immediate environmental monitoring.
  • UV-visible spectroscopy offers a potential avenue for rapid and accurate water quality assessment.

Purpose of the Study:

  • To develop and validate a portable water detecting system utilizing UV-visible spectra for real-time water quality analysis.
  • To establish a robust method for correlating spectral data with key water quality parameters like Chemical Oxygen Demand (COD).
  • To enhance the versatility and applicability of UV-based water testing technologies.

Main Methods:

  • Development of a water detecting system based on UV-visible spectroscopy.
  • Utilizing linear regression to correlate absorbance with Chemical Oxygen Demand (COD), achieving R2 > 0.99.
  • Implementing spectral comparison and normalization techniques for accurate parameter analysis.
  • Conducting extensive experiments with standard solutions and real water samples.

Main Results:

  • Achieved high accuracy (R2 > 0.99) in correlating UV-visible absorbance with COD.
  • Demonstrated single-measurement capability within 1 second for rapid analysis.
  • Successfully classified water samples and identified suitable mathematical models from a database.
  • Validated the system's ability to predict other water quality indices.

Conclusions:

  • The developed UV-visible spectroscopy system provides a fast, portable, and accurate solution for real-time water quality monitoring.
  • The spectral analysis methods enhance the system's adaptability to various water types and improve the prediction of multiple water quality parameters.
  • This technology offers a significant advancement for efficient water pollution control and prevention strategies.