Preprints
https://doi.org/10.5194/amt-2023-102
https://doi.org/10.5194/amt-2023-102
16 May 2023
 | 16 May 2023
Status: this preprint is currently under review for the journal AMT.

A Novel Inlet for Enriching Concentrations of Reactive Organic Gases in Low Sampling Flows

Namrata Shanmukh Panji and Gabriel Isaacman-VanWertz

Abstract. Preconcentration of samples is often necessary to detect the low levels of volatile organic compounds present in the atmosphere. We introduce a novel inlet that uses selective permeation to continuously concentrate organic gases in small sample flows (up to several sccm), and consequently improve the sensitivity and limits of detection of analytical instruments. We establish the dependence of enrichment on the sample flow (decreasing with increasing flow) and pressure differential across its walls (increasing with increasing pressure differential). We further show that while there is some dependence on the permeability of the target analyte, most analytes of atmospheric interest exhibit similar enrichment. Enrichments between 4640 % and 111 % were measured at flows of 0.2 to 3 sccm for major reactive atmospheric gases: isoprene (C5H8), monoterpenes (α-pinene, C10H16), and alkanes (C3-C6). The relationship between inlet design parameters, operating conditions, and inlet efficiency, are modeled and validated, enabling predictable enrichment of most atmospheric gases.

Namrata Shanmukh Panji and Gabriel Isaacman-VanWertz

Status: open (until 29 Jun 2023)

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Namrata Shanmukh Panji and Gabriel Isaacman-VanWertz

Namrata Shanmukh Panji and Gabriel Isaacman-VanWertz

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Short summary
Measuring volatile organic compounds (VOCs) in the atmosphere is crucial for understanding air quality and environmental impact. Since these compounds are present in low concentrations, preconcentration of samples is often necessary for accurate detection. To address this issue, we have developed a novel inlet that uses selective permeation to concentrate organic gases in small sample flows. This device offers a promising approach for accurately detecting low levels of VOCs in the atmosphere.