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Oxidative Cleavage of Alkenes: Ozonolysis

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Related Experiment Video

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In Vivo Assessment of Alveolar Macrophage Efferocytosis Following Ozone Exposure

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Published on: October 22, 2019

Ozone Cross-Section Measurement by Gas Phase Titration.

Joële Viallon¹, Philippe Moussay¹, Edgar Flores¹

¹Bureau International des Poids et Mesures (BIPM) , Pavillon de Breteuil, F-92312 Sèvres Cedex, France.

Analytical Chemistry

|October 12, 2016

Summary

New measurements of the ozone cross-section at 253.65 nm provide a revised value. This is crucial for accurate ozone monitoring and air quality regulations.

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Published on: February 19, 2018

Area of Science:

Atmospheric Chemistry
Metrology

Background:

Ground-level ozone (O3) is a regulated air pollutant impacting health and materials.
Current ozone monitoring relies on UV absorption instruments traceable to standard reference photometers.
The accuracy of these instruments depends on the precise value of the ozone absorption cross-section at 253.65 nm.

Purpose of the Study:

To redetermine the ozone absorption cross-section at 253.65 nm.
To improve the accuracy of ozone measurements for air quality monitoring.
To provide a revised, more reliable value for the ozone cross-section.

Main Methods:

Utilized gas phase titration (GPT) measurements at the BIPM facility.
Employed state-of-the-art flow measurement, chemiluminescence for NO, and cavity phase shift analyzer (CAPS) for NO2.
Performed titration experiments over a 100-500 nmol/mol concentration range using diluted standards.

Main Results:

Calculated ozone absorption cross-section values of 11.24 × 10⁻¹⁸ cm² molecule⁻¹ (±1.8% uncertainty) based on NO titration.
Obtained a value of 11.22 × 10⁻¹⁸ cm² molecule⁻¹ (±1.4% uncertainty) based on NO2 titration.
Reported values show excellent agreement with recent direct measurements on pure ozone.

Conclusions:

The redetermined ozone cross-section values support revising the conventionally accepted value.
The findings enhance the accuracy of ozone monitoring and air quality assessments.
This work contributes to improved traceability and reliability in atmospheric measurements.