Characterisation of particle collection and transmission in a polydimethylsiloxane based denuder sampler

Characterization of Gaseous and Particulate Phase Polycyclic Aromatic Hydrocarbons Emitted During Preharvest Burning of Sugar Cane in Different Regions of Kwa‐Zulu Natal, South Africa

“…separated by a 6-mm-diameter quartz fiber filter (QFF), held in position by a Teflon connector. This configuration allows for both gas and particulate phase sampling and has been validated in numerous studies (Forbes, 2015;Forbes et al, 2012;Forbes & Rohwer, 2009;Kohlmeier et al, 2017;Munyeza et al, 2019). The gas phase SVOCs were trapped by the first (primary) trap because the PDMS served as a solvent for these compounds; the particles were then trapped downstream on the QFF.…”

“…We collected PAHs in both gas and particle phases simultaneously using small portable denuder sampling devices that minimized sampling artifacts; each denuder component could be directly thermally desorbed, which avoids time‐consuming and environmentally unfriendly sample preparation procedures. This type of sampling device has been effectively used and validated in previous studies (Forbes, 2015; Geldenhuys et al, 2015; Kohlmeier et al, 2017; Munyeza et al, 2019). Our study, and others like it, are important for establishing best practice in sugar cane harvesting and related air quality monitoring, thus helping to enhance the environmental benefits of the sugar cane industry and its sustainability.…”

Novel Graphene Wool Gas Adsorbent for Volatile and Semivolatile Organic Compounds

“…The GW sampler was shown to be very effective in sampling alkanes in the volatile–semivolatile range, which were found to be in the low μg m –3 range with tetradecane being the most abundant, as seen in Figure . The performance of the GW sampler was directly compared to that of a PDMS sampler, which has been tested, validated, and applied in numerous studies, ,− ,, and it was found to be very comparable in both emission profiles and concentrations of each analyte, excluding hexadecane, with an % difference of 1.9% between the total alkane concentrations. The GW showed higher recoveries of the lower alkanes <C15 when compared to the PDMS but lower concentrations for the higher alkanes.…”

Atmospheric Chemistry Analysis: A Review

“…Effective and efficient sampling of each phase simultaneously is critical, however, in order to understand atmospheric chemistry processes and potential impacts of the target analytes. , Some samplers are prone to sampling artifacts, have unpredictable sampling efficiencies, or are not able to adequately differentiate between phases. Verification of particle transmission through gas phase denuder samplers is important in this regard . In the case of high volume samplers, which collect gas phase analytes downstream of a filter, it is necessary to verify that gas phase analytes are not sorbed onto the filter medium.…”

“…Verification of particle transmission through gas phase denuder samplers is important in this regard. 31 In the case of high volume samplers, which collect gas phase analytes downstream of a filter, it is necessary to verify that gas phase analytes are not sorbed onto the filter medium. This artifact was noted in the sampling of perfluorooctanoic acid, where sorption occurred onto glass fiber filters even when they were deactivated, 32 indicating that high volume sampling could only provide total atmospheric concentrations (if operated below breakthrough conditions) and not partitioning results.…”