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Related Concept Videos

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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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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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TVOC - Revisited.

Tunga Salthammer1

  • 1Fraunhofer WKI, Department of Material Analysis and Indoor Chemistry, Bienroder Weg 54 E, 38108 Braunschweig, Germany.

Environment International
|August 6, 2022
PubMed
Summary
This summary is machine-generated.

Total volatile organic compounds (TVOC) definitions have evolved over 40 years in indoor air science. Understanding TVOC

Keywords:
Health related assessmentPhotoacousticsPhotoionizationScreening of IAQSum valuesToluene equivalents

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Area of Science:

  • Indoor air quality and environmental science.
  • Analytical chemistry and measurement techniques.

Background:

  • Total volatile organic compounds (TVOC) has been a sum parameter in indoor air sciences for over four decades.
  • Early TVOC calculations involved summing individual gas chromatography-determined VOC concentrations.
  • Multiple methods for calculating TVOC have emerged over time, leading to varied definitions.

Purpose of the Study:

  • To trace the historical development and explain the manifold definitions of TVOC.
  • To critically evaluate various TVOC values, their measurement methods, and applications.
  • To provide a deeper understanding for correct TVOC parameter usage and assessment of published results.

Main Methods:

  • Historical literature search for original TVOC approaches.
  • Detailed description and critical evaluation of TVOC measurement methods.
  • Inclusion of related sum parameters like TSVOC and TVVOC.

Main Results:

  • A 1997 analytical definition of VOCs and TVOC was a milestone, but the provided list of compounds is outdated.
  • Ongoing harmonization efforts by a European working group aim to update TVOC definitions.
  • Confusion persists regarding the precise definition and appropriate application of TVOC, with other sensor signals often mislabeled as TVOC.

Conclusions:

  • TVOC is recognized as a non-toxicological parameter, suitable only for limited screening purposes.
  • TVOC is inappropriate for health-related or odor assessments, despite frequent misapplication.
  • Misuse of TVOC has led to scientific controversy and legal disputes regarding its correct application.