Gas collection efficiency of annular denuders: A spreadsheet-based calculator

Development of an online-coupled MARGA upgrade for the 2 h interval quantification of low-molecular-weight organic acids in the gas and particle phases

“…Low-molecular-weight organic acids have been measured in the gas (Lee et al, 2009;Bao et al, 2012) and particle phases (Boreddy et al, 2017;Miyazaki et al, 2014;van Pinxteren et al, 2014) as well as in precipitation and cloud water (Sun et al, 2016;. Next to known primary anthropogenic (Bock et al, 2017;Kawamura and Kaplan, 1987;Legrand et al, 2007) and biogenic sources (Falkovich et al, 2005;Stavrakou et al, 2012), organic acids are formed as secondary products by atmospheric oxidation processes (Lim et al, 2005;Tilgner and Herrmann, 2010;Hoffmann et al, 2016). However, there are still unknown sources of these short-chained compounds (Millet et al, 2015;Stavrakou et al, 2012).…”

Mobile monitoring along a street canyon and stationary forest air monitoring of formaldehyde by means of a micro-gas analysis system

“…HCHO was not detected by the mGAS when the Nafion wet scrubber was placed before the microchannel scrubber. The removal efficiency of the wet scrubber was estimated to be 99% based on the spreadsheet developed by Berg et al, 45,46 assuming that the Nafion surface acted as a perfect sink for HCHO. The low levels of HCHO and high levels of O 3 could be measured using PD chemistry with treatment of the air sample by two three-way solenoid valves, the active carbon column and the wet scrubber (Fig.…”

Miniature open channel scrubbers for gas collection

“…While these calculations were intended for heat transfer problems, they apply equally well to mass transfer problems. For the uninitiated, however, the use of the original tables from Lundberg et al is difficult; solutions directly relevant to the annular denuder geometry have recently been made available in spreadsheet form [29].…”