Offline thermal-desorption proton-transfer-reaction mass spectrometry to study composition of organic aerosol

Timkovsky, J.; Dusek, U.; Henzing, Bas; Kuipers, T.; Röckmann, T.; Holzinger, Rupert

doi:10.1016/j.jaerosci.2014.08.010

Cited by 21 publications

(25 citation statements)

References 32 publications

(35 reference statements)

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“…Known quantities of each acid were first dissolved in ethanol, and then an aliquot of the solution containing 10 µg of a substance was placed on a quartz filter with a diameter of 5 mm. Next, 2 min were allowed to let most of the solvent evaporate before the filter was inserted in the oven, which is a part of the offline TD-PTR-MS system described in detail by Timkovsky et al (2015) (Fig. 1b).…”

Section: Preparation and Measurement Of Standardsmentioning

confidence: 99%

“…The filter measuring procedure is described in detail by Timkovsky et al (2015). In short, the sample is placed in the oven and allowed to stabilize for 2 min.…”

Section: Preparation and Measurement Of Standardsmentioning

confidence: 99%

“…3.2.2. The maximum total uncertainty of ∼ 54 % (mostly due to the uncertainty of the reaction rate coefficient) was calculated for these mass concentrations based on the method described by Timkovsky et al (2015).…”

Section: In Situ and Offline Td-ptr-ms Datamentioning

confidence: 99%

“…The obtained data with a 3 min resolution were processed according to the procedure described in Timkovsky et al (2015). In short, the instrument background and blank corrected mass at a single temperature step (A T , in ng) was calculated according to Eq.…”

Section: In Situ and Offline Td-ptr-ms Datamentioning

confidence: 99%

“…This hypothesis is supported by the fact that positive artifacts have been shown to be more severe on filters with short air sampling duration. For example, Timkovsky et al (2015) demonstrated substantial positive filter sampling artifacts on filters sampled for 24 h, which were much reduced with sampling durations of 48 and 72 h.…”

Section: Alkanoic Acidsmentioning

confidence: 99%

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Comparison of advanced offline and in situ techniques of organic aerosol composition measurement during the CalNex campaign

et al. 2015

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Abstract. Our understanding of formation processes, physical properties, and climate/health effects of organic aerosols is still limited in part due to limited knowledge of organic aerosol composition. We present speciated measurements of organic aerosol composition by two methods: in situ thermaldesorption proton-transfer-reaction mass spectrometry (TD-PTR-MS) and offline two-dimensional gas chromatography with a time-of-flight mass spectrometer (GC × GC/TOF-MS). Using the GC × GC/TOF-MS 153 compounds were identified, 123 of which were matched with 64 ions observed by the TD-PTR-MS. A reasonable overall correlation of 0.67 (r 2 ) was found between the total matched TD-PTR-MS signal (sum of 64 ions) and the total matched GC × GC/TOF-MS signal (sum of 123 compounds) for the Los Angeles area. A reasonable quantitative agreement between the two methods was observed for most individual compounds with concentrations which were detected at levels above 2 ng m −3 using the GC × GC/TOF-MS. The analysis of monocarboxylic acids standards with TD-PTR-MS showed that alkanoic acids with molecular masses below 290 amu are detected well (recovery fractions above 60 %). However, the concentrations of these acids were consistently higher on quartz filters (quantified offline by GC × GC/TOF-MS) than those suggested by in situ TD-PTR-MS measurements, which is consistent with the semivolatile nature of the acids and corresponding positive filter sampling artifacts.

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Section: Preparation and Measurement Of Standardsmentioning

confidence: 99%

“…The filter measuring procedure is described in detail by Timkovsky et al (2015). In short, the sample is placed in the oven and allowed to stabilize for 2 min.…”

Section: Preparation and Measurement Of Standardsmentioning

confidence: 99%

Section: In Situ and Offline Td-ptr-ms Datamentioning

confidence: 99%

Section: In Situ and Offline Td-ptr-ms Datamentioning

confidence: 99%

Section: Alkanoic Acidsmentioning

confidence: 99%

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