Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Evaluation NO2 Detection Using Low-Cost Folded Path Photometer

Version 1 : Received: 18 November 2021 / Approved: 19 November 2021 / Online: 19 November 2021 (13:10:13 CET)

How to cite: Fatkhurrahman, J.A.; Lestari, P. Evaluation NO2 Detection Using Low-Cost Folded Path Photometer. Preprints 2021, 2021110355 (doi: 10.20944/preprints202111.0355.v1). Fatkhurrahman, J.A.; Lestari, P. Evaluation NO2 Detection Using Low-Cost Folded Path Photometer. Preprints 2021, 2021110355 (doi: 10.20944/preprints202111.0355.v1).

Abstract

Nitrogen dioxide (NO2) contributes to several impacts both for human health and the environment. Periodical measurement of NO2 at industrial and residential areas needs comprehensive and reliable instrumentation; long-interference-free measures with minimum maintenance and re-calibration. DOAS can be used as a direct measurement technique based on specific absorption characteristics of NO2 follow Beer-Lambert law. This research applies a low-cost folded path photometer for measurement NO2 in air. Cheap tubular acrylic used as a detection cell with a 3D printed framework makes it compact, modular, and flexible. Evaluation of the DOAS conducted by instrument test responses using NO2 gas. The estimated LOD was ~ 1263 pb using 2 nm resolution of the spectrometer and 6-meter detection cell length. Deviation of the DOAS estimated to be 0.8% at high concentration and 2.85% at a low concentration based on DOAS calibration. An intercomparison between methods used to evaluate instrument performance to measure NO2 using emission from a motorcycle with coefficient correlation (R) 0.649 for paired DOAS-ASTM D1607 Griesz Saltzmann Method 0.846 for paired DOAS-Electrochemical Gas Analyzer. This significant correlation is caused by different respond time between paired methods, while it is still comparable for NO2 measurement.

Keywords

DOAS; intercomparison; nitrogen dioxide; photoabsorption; spectrometer

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