Denuder sampling techniques for the determination of gas-phase carbonyl compounds: A comparison and characterisation of in situ and ex situ derivatisation methods

Derivatization techniques for determination of carbonyls in air

“…The LODs (ppb) for 600-L samples ranged from 0.2 (XAD-4 and XAD-4/DNPH) for FA to 0.03 (XAD-4) or 0.01 (XAD-4/DNPH) for benzaldehyde; this compares favorably with the literature [85][86][87][88][89][90][91] cited by Kahnt et al [34] (e.g., silica/DNPH cartridges, C18/DNPH cartridges, PFBHA impinger, PFBHA coated denuder, FTIR, DNPH coil sampler, and CIMS) (see Table 3 for other comparisons).…”

“…One set of denuders were coated with acidified DNPH for in-situ derivatization, whilst the other set were not DNPH coated for ex situ derivatization in studies with a 19 m 3 Teflon chamber (S/ V = 2 m −1 ) [34]. The studied CCs [1-171 ppb, except pinnaldehyde (0.02-0.13 ppb)] at 3% or 50% RH were injected into the chamber and monitored by PTR-MS for~15 min until a steady state was obtained before denuder sampling (10 L min −1 for 1 h, 0.6 m 3 total volume).…”

“…Szulejko, K-H. Kim /Trends in Analytical Chemistry64 (2015) [29][30][31][32][33][34][35][36][37][38][39][40][41] …”

A quantification method for heat-decomposable methylglyoxal oligomers and its application on 1,3,5-trimethylbenzene SOA

“…An average density of 1 g cm −3 was used to calculate the increase in the organic particle mass ( M). To collect the particle phase after the experiments, 1.2 m 3 of the chamber volume was sampled on a PTFE filter (borosilicate glass fibre filter Kahnt et al, 2011) to avoid artefacts caused by adsorption of gas-phase organic compounds onto the filter.…”

Kinetic modeling studies of SOA formation from <i>α</i>-pinene ozonolysis

“…An average density of 1 g cm −3 was applied to calculate the produced organic particle mass ( OM). The particle phase was sampled on filters at the end of the experiments and analyzed afterwards by Ultra Performance Liquid Chromatography coupled to an Electrospray Ionisation Time-of-Flight Mass Spectrometer (UPLC/ESI(-)-TOFMS, Waters, MA, USA); 1.8 m 3 of the chamber volume was collected on a PTFE filter (borosilicate glass fiber filter coated with fluorocarbon, 47 mm in diameter, PALLFLEX T60A20, PALL, NY, USA), which was connected to a denuder (URG-2000-30B5, URG Corporation, Chapel Hill, NC, USA, Kahnt et al, 2011) to avoid gasphase artifacts. Furthermore, PTR-MS measurements were performed in order to monitor the key oxidation products of the α-pinene ozonolysis, such as pinonaldehyde.…”