Optical detection of formaldehyde in air in the 3.6 µm range

Winkowski, Mateusz; Stacewicz, T.

doi:10.1364/boe.405384

Cited by 16 publications

(6 citation statements)

References 67 publications

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“…4 for 0 %-50 % RH (100 ppt) and by a factor of 2 under 70 % RH (200 ppt; Ta-ble 2). These detection limits, based on a signal to noise ratio, S/N = 3.3, are comparable to, or lower than, those reported in the PTR-MS studies that mentioned DLs between 200-500 ppt with S/N = 2 (Inomata et al, 2008) and DLs of 100 ppt under dry and 300 ppt under humid conditions, using S/N = 1 (Warneke et al, 2011), and close to the most performance spectroscopic techniques noting DLs at around 80 ppt (Catoire et al, 2012;Winkowski and Stacewicz, 2020).…”

Section: Wrap Up On Formaldehyde Determinationsupporting

confidence: 77%

Formaldehyde and glyoxal measurement deploying a selected ion flow tube mass spectrometer (SIFT-MS)

2022

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Abstract. Formaldehyde (FM) and glyoxal (GL) are important atmospheric species of indoor and outdoor environments. They are either directly emitted in the atmosphere, or they are formed through the oxidation of organic compounds by indoor and/or outdoor atmospheric oxidants. Despite their importance, the real-time monitoring of these compounds with soft ionization mass spectrometric techniques, e.g., proton transfer mass spectrometry (PTR-MS), remains problematic and is accompanied by low sensitivity. In this study, we evaluate the performance of a multi-ion selected ion flow tube mass spectrometer (SIFT-MS) to monitor in real-time atmospherically relevant concentrations of FM and GL under controlled experimental conditions. The SIFT-MS used is operated under standard conditions (SCs), as proposed by the supplier, and custom conditions (CCs) to achieve higher sensitivity. In the case of FM, SIFT-MS sensitivity is marginally impacted by relative humidity (RH), and the detection limits achieved are below 200 ppt (parts per trillion). Contrariwise, in the case of GL, a sharp decrease of instrument sensitivity is observed with increasing RH when the H3O+ ion is used. Nevertheless, the detection of GL, using NO+ precursor ion, is moderately impacted by moisture with an actual positive sensitivity response. Therefore, we recommend the use of the NO+ precursor for the reliable detection and quantitation of GL. This work evidences that SIFT-MS can be considered as an efficient tool to monitor the concentration of FM and GL in laboratory experiments, and potentially in indoor or outdoor environments, capable of identifying their primary emission or secondary formation through (photo)oxidation processes. Furthermore, SIFT-MS technology still allows great possibilities for sensitivity improvement and high potential for monitoring low proton transfer affinity compounds.

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Section: Wrap Up On Formaldehyde Determinationsupporting

confidence: 77%

Formaldehyde and glyoxal measurement deploying a selected ion flow tube mass spectrometer (SIFT-MS)

2022

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“…135 The optical sensor of formaldehyde based on multi-pass absorption spectroscopy has been developed to search for the possible cancer biomarker in air exhaled from human lungs. 136 The selection of the spectral range (3595.77 / 3596.20 nm), and the use of sample pressure reduced to 0.01 atm, enabled to immunize the detection against typical interferents present in breath at high concentration including water vapor, carbon dioxide and methane.…”

Section: Reviewmentioning

confidence: 99%

Analytical methods for the analysis of volatile natural products

2023

Nat. Prod. Rep.

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“…This procedure is expensive, time consuming and cannot be done in real time [36]. One of the newer development in technology is the use of infrared spectroscopy for accurate real-time detection of formaldehyde [37]. This will be the principle of operation of the reference device used in our study [38].…”

Section: B Measuring Technologiesmentioning

confidence: 99%

Low-Cost Formaldehyde Sensor Evaluation and Calibration in a Controlled Environment

Chattopadhyay

Huertas²,

Rebeiro‐Hargrave

et al. 2022

IEEE Sensors J.

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Formaldehyde is a carcinogenic indoor air pollutant emitted from common wood-based materials. Low-cost sensing of formaldehyde is difficult due to inaccuracies in measuring low concentrations and susceptibility of sensors to changing indoor environmental conditions. Currently gas sensors are calibrated by manufacturers using simplistic models which fail to capture their complex behaviour. We evaluated different low-cost gas sensors to ascertain a suitable component to create a mobile sensing node and built a calibration algorithm to correct it. We compared the performance of 2 electrochemical sensors and 3 metal oxide sensors in a controlled chamber against a photo-acoustic reference device. In the chamber the formaldehyde concentrations, temperature and humidity were varied to assess the sensors in diverse environments. Pre-calibration, the electrochemical sensors (mean absolute error (MAE) = 70.8 ppb) outperformed the best performing metal oxide sensor (MAE = 335 ppb). A two-stage calibration model was built, using linear regression followed by random forest, where the residual of the first stage acted as a input for the second. Post-calibration, the metal oxide sensors (MAE = 154 ppb) improved compared to their electrochemical counterparts (MAE = 78.8 ppb). Nevertheless, the uncalibrated electrochemical sensor showed overall superior performance hence was selected for the mobile sensing node.

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Optical detection of formaldehyde in air in the 3.6 µm range

Cited by 16 publications

References 67 publications

Formaldehyde and glyoxal measurement deploying a selected ion flow tube mass spectrometer (SIFT-MS)

Formaldehyde and glyoxal measurement deploying a selected ion flow tube mass spectrometer (SIFT-MS)

Analytical methods for the analysis of volatile natural products

Low-Cost Formaldehyde Sensor Evaluation and Calibration in a Controlled Environment

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