Development and validation of a thermally regulated atmospheric simulation chamber (THALAMOS): A versatile tool to simulate atmospheric processes

Osseiran, N.; Romanías, Manolis N.; Gaudion, V.; Angelaki, Maria E.; Papadimitriou, Vassileios C.; Tomás, A.; Coddeville, P.; Thévenet, F.

doi:10.1016/j.jes.2020.03.036

Cited by 8 publications

(9 citation statements)

References 46 publications

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“…Toluene, propanol, and tetrahydrofuran were used as reference compounds. The temperature dependent expressions for each reference used in the framework of the current study were: k (toluene + Cl) = (5.85 ± 0.12) × 10 −11 cm 3 molecule –1 s –1 recommended over 253–333 K in the recent work of Osseiran et al., 18 k (propanol + Cl) =

( {2.68 \pm 0.20} ) \times {10^{ - 10}}ex{p^{( { - \frac{{127 \pm 20}}{T}} )}}\;

cm 3 molecule –1 s –1 recommended over 260–380 K, 24 and k (tetrahydrofuran + Cl) = (2.71 ± 0.34) × 10 −10 cm 3 molecule –1 s –1 , recommended over 298–362 K 25 …”

Section: Methodsmentioning

confidence: 99%

“…Further information about THALAMOS facility can be found elsewhere, and only basic information is given herein (Figure S1). [18][19][20] THALA-MOS is a 0.6 m 3 Teflon chamber placed inside a climatic box (Vötsch VT-4100, effective volume of 1.2 m 3 ) capable to control the temperature between 231 and 453 K. Several fans are used inside the climatic box and inside the Teflon chamber to ensure fast temperature equilibration of the air surrounding the walls of the Teflon chamber and the homogeneous mixing of reagents inside the Teflon chamber, respectively. The chamber is equipped with a heated admission system to inject the compound of interest or radical/atom precursors in their gas or liquid form.…”

Section: Description Of Thalamos Facilitymentioning

confidence: 99%

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Reassessment of the temperature dependent oxidation of 2‐methyl‐3‐butene‐2‐ol (MBO) by Cl atoms: A kinetic and product study

Allani

Romanías

2022

Int J of Chemical Kinetics

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In the current study, the temperature dependence of the Cl atom rate coefficient with 2‐methyl‐3‐butene‐2‐ol (MBO) is re‐assessed. Relative rate kinetic measurements were performed inside THALAMOS (thermally regulated atmospheric simulation chamber) facility under atmospheric pressure (760 Torr) of zero air in the temperature range of 256–353 K. The rate coefficient of the title reaction was found to be independent of temperature with a value of kMBO = (3.20 ± 0.10) × 10−10 cm3 molecule–1 s–1, where the quoted error corresponds to 2σ standard error of the mean value and includes the overall uncertainty of the measurements. Besides the kinetic study we have also determined the yields of the major products formed, in the temperature range of 273–353 K. Acetone and chloroacetaldehyde were identified as primary oxidation products with almost identical yields, ranging between 60% and 80%. Formaldehyde and methyl vinyl ketone were also observed with yields below 10% and 0.5%, respectively. Our experimental results indicate that the dominant reaction pathway is the addition of Cl atoms to the terminal carbon atom of MBO.

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( {2.68 \pm 0.20} ) \times {10^{ - 10}}ex{p^{( { - \frac{{127 \pm 20}}{T}} )}}\;

cm 3 molecule –1 s –1 recommended over 260–380 K, 24 and k (tetrahydrofuran + Cl) = (2.71 ± 0.34) × 10 −10 cm 3 molecule –1 s –1 , recommended over 298–362 K 25 …”

Section: Methodsmentioning

confidence: 99%

Section: Description Of Thalamos Facilitymentioning

confidence: 99%

Reassessment of the temperature dependent oxidation of 2‐methyl‐3‐butene‐2‐ol (MBO) by Cl atoms: A kinetic and product study

Allani

Romanías

2022

Int J of Chemical Kinetics

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“…THALAMOS is an indoor atmospheric simulation chamber where temperature-dependent studies of homogeneous or heterogeneous processes are carried out (Figure ). , THALAMOS consists of a 0.6 m 3 Teflon chamber placed inside a climatic box (Vötsch industrietechnik VT-4100, effective volume of 1.2 m 3 ) to control the temperature between 231 and 453 K. Several fans are used inside the climatic box and inside the Teflon chamber to ensure fast temperature equilibration of the air surrounding the walls of the Teflon chamber and the homogeneous mixing of reagents inside the Teflon chamber, respectively. The temperature, pressure, and relative humidity (RH) inside the chamber are continuously monitored and recorded with appropriately calibrated probes.…”

Section: Experimental Sectionmentioning

confidence: 99%

Reaction Rate Coefficient of OH Radicals with d₉-Butanol as a Function of Temperature

et al. 2021

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d 9-Butanol or 1-butan-d 9-ol (D9B) is often used as an OH radical tracer in atmospheric chemistry studies to determine OH exposure, a useful universal metric that describes the extent of OH radical oxidation chemistry. Despite its frequent application, there is only one study that reports the rate coefficient of D9B with OH radicals, k 1(295 K), which limits its usefulness as an OH tracer for studying processes at temperatures lower or higher than room temperature. In this study, two complementary experimental techniques were used to measure the rate coefficient of D9B with OH radicals, k 1(T), at temperatures between 240 and 750 K and at pressures within 2–760 Torr. A thermally regulated atmospheric simulation chamber was used to determine k 1(T) in the temperature range of 263–353 K and at atmospheric pressure using the relative rate method. A low-pressure (2–10 Torr) discharge flow tube reactor coupled with a mass spectrometer was used to measure k 1(T) at temperatures within 240–750 K, using both the absolute and relative rate methods. The agreement between the two experimental aproaches followed in this study was very good, within 6%, in the overlapping temperature range, and k 1(295 ± 3 K) was 3.42 ± 0.26 × 10–12 cm3 molecule–1 s–1, where the quoted error is the overall uncertainty of the measurements. The temperature dependence of the rate coefficient is well described by the modified Arrhenius expression, k 1 = (1.57 ± 0.88) × 10–14 × (T/293)4.60±0.4 × exp(1606 ± 164/T) cm3 molecule–1 s–1 in the range of 240–750 K, where the quoted error represents the 2σ standard deviation of the fit. The results of the current study enable an accurate estimation of OH exposure in atmospheric simulation experiments and expand the applicability of D9B as an OH radical tracer at temperatures other than room temperature.

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“…SIFT-MS has extensively been used for breath analysis and in food science, but it is not commonly used in atmospheric science, where, traditionally, PTR-MS is widely applied. Nevertheless, in the last decade, the application of SIFT-MS technology for the study of atmospherically relevant processes became more frequent, where SIFT-MS is either coupled to experimental chambers with various volumes for indoor studies (Caron et al, 2016(Caron et al, , 2020Thevenet et al, 2021) or atmospheric simulation chambers for the study of VOC degradation (Osseiran et al, 2020;Allani et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Formaldehyde and glyoxal measurement deploying a selected ion flow tube mass spectrometer (SIFT-MS)

2022

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Abstract. Formaldehyde (FM) and glyoxal (GL) are important atmospheric species of indoor and outdoor environments. They are either directly emitted in the atmosphere, or they are formed through the oxidation of organic compounds by indoor and/or outdoor atmospheric oxidants. Despite their importance, the real-time monitoring of these compounds with soft ionization mass spectrometric techniques, e.g., proton transfer mass spectrometry (PTR-MS), remains problematic and is accompanied by low sensitivity. In this study, we evaluate the performance of a multi-ion selected ion flow tube mass spectrometer (SIFT-MS) to monitor in real-time atmospherically relevant concentrations of FM and GL under controlled experimental conditions. The SIFT-MS used is operated under standard conditions (SCs), as proposed by the supplier, and custom conditions (CCs) to achieve higher sensitivity. In the case of FM, SIFT-MS sensitivity is marginally impacted by relative humidity (RH), and the detection limits achieved are below 200 ppt (parts per trillion). Contrariwise, in the case of GL, a sharp decrease of instrument sensitivity is observed with increasing RH when the H3O+ ion is used. Nevertheless, the detection of GL, using NO+ precursor ion, is moderately impacted by moisture with an actual positive sensitivity response. Therefore, we recommend the use of the NO+ precursor for the reliable detection and quantitation of GL. This work evidences that SIFT-MS can be considered as an efficient tool to monitor the concentration of FM and GL in laboratory experiments, and potentially in indoor or outdoor environments, capable of identifying their primary emission or secondary formation through (photo)oxidation processes. Furthermore, SIFT-MS technology still allows great possibilities for sensitivity improvement and high potential for monitoring low proton transfer affinity compounds.

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Development and validation of a thermally regulated atmospheric simulation chamber (THALAMOS): A versatile tool to simulate atmospheric processes

Cited by 8 publications

References 46 publications

Reassessment of the temperature dependent oxidation of 2‐methyl‐3‐butene‐2‐ol (MBO) by Cl atoms: A kinetic and product study

Reassessment of the temperature dependent oxidation of 2‐methyl‐3‐butene‐2‐ol (MBO) by Cl atoms: A kinetic and product study

Reaction Rate Coefficient of OH Radicals with d₉-Butanol as a Function of Temperature

Formaldehyde and glyoxal measurement deploying a selected ion flow tube mass spectrometer (SIFT-MS)

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Development and validation of a thermally regulated atmospheric simulation chamber (THALAMOS): A versatile tool to simulate atmospheric processes

Cited by 8 publications

References 46 publications

Reassessment of the temperature dependent oxidation of 2‐methyl‐3‐butene‐2‐ol (MBO) by Cl atoms: A kinetic and product study

Reassessment of the temperature dependent oxidation of 2‐methyl‐3‐butene‐2‐ol (MBO) by Cl atoms: A kinetic and product study

Reaction Rate Coefficient of OH Radicals with d9-Butanol as a Function of Temperature

Formaldehyde and glyoxal measurement deploying a selected ion flow tube mass spectrometer (SIFT-MS)

Contact Info

Product

Resources

About

Reaction Rate Coefficient of OH Radicals with d₉-Butanol as a Function of Temperature