Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS)

Overview

Journal Sensors (Basel)

Publisher MDPI

Specialty Biotechnology

Date 2022 Apr 12

PMID 35408239

Authors

Ryan Thalman

Nitish Bhardwaj

Callum E Flowerday

Jaron C Hansen

Affiliations

Soon will be listed here.

Abstract

Sulfur dioxide (SO) is an important precursor for the formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of SO with a minimum limit of detection of 0.75 ppbv (3-σ) using the spectral range 305.5-312 nm and an averaging time of 5 min. The instrument consists of high-reflectivity mirrors (0.9985 at 310 nm) and a deep UV light source (Light Emitting Diode). The effective absorption path length of the instrument is 610 m with a 0.966 m base length. Published reference absorption cross sections were used to fit and retrieve the SO concentrations and were compared to fluorescence standard measurements for SO. The comparison was well correlated, R = 0.9998 with a correlation slope of 1.04. Interferences for fluorescence measurements were tested and the BBCEAS showed no interference, while ambient measurements responded similarly to standard measurement techniques.

Citing Articles

Lead acetate-based test strip method for rapid and quantitative detection of residual sulfur dioxide in Chinese herbal medicines.

Zhao P, Huang X, Li Y, Zhang H, Wang Q, Li D PLoS One. 2024; 19(11):e0310628.

PMID: 39531460 PMC: 11556703. DOI: 10.1371/journal.pone.0310628.

Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) Coupled with an Interferometer for On-Band and Off-Band Detection of Glyoxal.

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