iDirac: a field-portable instrument for long-term autonomous measurements of isoprene and selected VOCs

Bolas, Conor G.; Ferracci, Valerio; Robinson, Andrew D.; Mead, Mohammed I.; Nadzir, Mohd Shahrul Mohd; Pyle, John A.; Jones, Roderic L.; Harris, Neil R. P.

The iDirac is a new instrument to measure selected hydrocarbons in the remote atmosphere. A robust design is central to its specifications, with portability, power efficiency, low gas consumption and autonomy as the other driving factors in the instrument development. The iDirac is a dual-column isothermal oven gas chromatograph with photoionisation detection (GC-PID). The instrument is designed and built in-house. It features a modular design, with the novel use of open-source technology for accurate instrument control. Currently configured to measure biogenic isoprene, the system is suitable for a range of compounds. For isoprene measurements in the field, the instrument precision (relative standard deviation) is inline-formula±10 %, with a limit of detection down to 38 pmol molinline-formula−1 (or ppt). The instrument was first tested in the field in 2015 during a ground-based campaign, and has since shown itself suitable for deployment in a variety of environments and platforms. This paper describes the instrument design, operation and performance based on laboratory tests in a controlled environment as well as during deployments in forests in Malaysian Borneo and central England.

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Bolas, Conor G. / Ferracci, Valerio / Robinson, Andrew D. / et al: iDirac: a field-portable instrument for long-term autonomous measurements of isoprene and selected VOCs. 2020. Copernicus Publications.

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