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[Study of retrieving formaldehyde with differential optical absorption spectroscopy].

Yu-Jin Li¹, Pin-Hua Xie, Min Qin

¹Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|April 24, 2009

Summary

This study presents a new method for measuring formaldehyde (HCHO) concentration using differential optical absorption spectroscopy (DOAS). The technique accurately quantifies HCHO by simultaneously analyzing SO2, NO2, and O3, achieving high precision.

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Area of Science:

Environmental Science
Analytical Chemistry
Atmospheric Chemistry

Context:

Formaldehyde (HCHO) is a key air pollutant with significant environmental and health impacts.
Accurate measurement of HCHO is crucial for air quality monitoring and source apportionment.
Existing methods for HCHO detection can be affected by interfering gases and spectral complexities.

Purpose:

To introduce and validate a novel method for retrieving ambient formaldehyde (HCHO) concentration using differential optical absorption spectroscopy (DOAS).
To address challenges in HCHO measurement, including spectral interferences from sulfur dioxide (SO2), nitrogen dioxide (NO2), and ozone (O3), as well as Xenon lamp spectral variations.
To develop a robust DOAS-based approach for simultaneous quantification of multiple trace gases.

Summary:

The study details the development and application of a custom-built DOAS instrument for measuring ambient HCHO in Beijing.
A non-linear least square fitting method was employed for simultaneous retrieval of HCHO, SO2, NO2, and O3 concentrations, mitigating spectral interferences and Xenon lamp structure effects.
The method successfully avoids issues related to narrow band selection and residual absorption from interfering species, leading to reliable HCHO concentration data.

Impact:

Provides a more accurate and reliable method for monitoring formaldehyde levels in urban atmospheres.
Contributes to a better understanding of HCHO sources and atmospheric chemistry.
The developed DOAS technique offers a valuable tool for air quality research with a total error within 13.7%.