Double-layer Tedlar bags: a means to limit humidity evolution of air samples and to dry humid air samples

Cariou, Stéphane; Guillot, Jean-Michel

doi:10.1007/s00216-005-0177-4

Cited by 37 publications

(28 citation statements)

References 15 publications

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“…In contrast, the CO mole fractions decrease in the Tedlar bags, coupled with a significant increase of water vapour mole fractions of up to ~1% (Fig. 2d), which is due to the high permeability of the bag material to water vapour and has been observed in previous studies (Beghi and Guillot, 2006;Cariou and Guillot, 2006). The increase of water vapour mole fractions in the MLF bags is only up to 0.01%.…”

Section: The Storage Test Results 20supporting

confidence: 61%

“…Previous studies show that the material of Tedlar bags is prone to water vapour diffusion (Beghi and Guillot, 2006;Cariou and Guillot, 2006), which leads to humidified air samples after four hours of storage. The CO2, CH4 and CO dry mole fractions are obtained by applying the water vapour corrections described in Chen et al, 2013 andRella et al, 2013. …”

Section: Where [X] Is the Measured Mole Fraction 15mentioning

confidence: 99%

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LISA: a lightweight stratospheric air sampler

Hooghiem¹,

Vries²,

Been³

et al. 2018

Preprint

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Abstract. We developed a new LIghtweight Stratospheric Air sampler (LISA). The LISA sampler is designed to collect four bag samples in the stratosphere during a balloon flight for CO2, CH4 and CO mole fraction measurements. It consists of 4Multi-Layer Foil (MLF) sampling bags, a custom-made manifold, and a diaphragm pump, with a total weight of ~2.5 kg. A 10 series of laboratory storage tests were performed to assess the stability of CO2, CH4, CO and H2O mole fractions in both MLF and Tedlar bags. The MLF bag was chosen due to its better overall performance than the Tedlar bag for the four species CO2, CH4, CO and H2O. Furthermore, we evaluated the performance of the pump under low-pressure conditions to optimise a tradeoff between the vertical resolution and the sample size. High-accuracy stratospheric measurements of greenhouse gas mole fractions are useful to validate remote sensing measurements from ground and from space, which has been primarily performed by comparison with collocated aircraft measurements (0.15 -13 km), and more recently with AirCore observations (0 -30 km). While AirCore is capable of achieving high-accuracy greenhouse gas mole fraction measurements, it is challenging to obtain accurate altitude registration for AirCore measurements. The LISA sampler provides a viable low-cost tool for retrieving stratospheric air samples for greenhouse gas 25 measurements that is complementary to AirCore. Furthermore, The LISA sampler is advantageous in both the vertical resolution and the sample size to perform routine stratospheric measurements of isotopic compositions of trace gases.

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Section: The Storage Test Results 20supporting

confidence: 61%

Section: Where [X] Is the Measured Mole Fraction 15mentioning

confidence: 99%

LISA: a lightweight stratospheric air sampler

Hooghiem¹,

Vries²,

Been³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…However, Nielsen and Jonsson [34] did not observe losses for H 2 S, MeSH, COS, DMS and CS 2 in samples with RH = 30% stored in Tedlar bags over the period of 20 h. The main problems during such studies are instability of water concentration in some sampling containers (e.g. Tedlar [27,28,34]) and some analytical problems during the gas chromatographic analysis of VSCs in humidified samples. The most commonly reported humidity effects are: decrease of the adsorption capacity of the sorbents, plugging of cold traps at sub-zero temperatures and retention time variations in the case of the sorbent trapping [21,38,39], and decrease of the extraction efficiency in the SPME [35].…”

Section: Stability Testsmentioning

confidence: 91%

“…This is due to their moderate price, inertness, relatively good durability and reusability. Unfortunately, several phenomena affecting sample composition like permeation through the bag walls, reversible/irreversible adsorption and pollutants emission from bags film have been reported [24,[27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Suitability of different polymer bags for storage of volatile sulphur compounds relevant to breath analysis

Mochalski

Wzorek

Śliwka

et al. 2009

Journal of Chromatography B

123

121

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“…In addition, Tedlar bags may be effective at holding VSCs in dry environments (Sulyok et al, 2001); however, in humid environments, this technique has been shown to sorb and potentially degrade VSCs (Kuster and Goldan, 1987). Drying of air using desiccates has been shown to improve results with Tedlar bags, but the results are short term due to the diffusion of humidity into the bags with storage (Nielsen and Jonsson, 2002a, b;Cariou and Guillot, 2006). Stainless-steel canisters and surfaces have also been found unsuitable material for the sampling and transferring of VSCs since exposure to these surfaces leads to the rapid loss of the most reactive compounds (Parmar et al, 1996;Kim et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Field sampling method for quantifying volatile sulfur compounds from animal feeding operations

Trabue

Scoggin

Mitloehner

et al. 2008

Atmospheric Environment

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Volatile sulfur compounds (VSCs) are a major class of chemicals associated with odor from animal feeding operations (AFOs). Identifying and quantifying VSCs in air is challenging due to their volatility, reactivity, and low concentrations. In the present study, a canister-based method collected whole air in fused silica-lined (FSL) mini-canister (1.4 L) following passage through a calcium chloride drying tube. Sampled air from the canisters was removed (10-600 mL), dried, pre-concentrated, and cryofocused into a GC system with parallel detectors (mass spectrometer (MS) and pulsed flame photometric detector (PFPD)). The column effluent was split 20:1 between the MS and PFPD. The PFPD equimolar sulfur response enhanced quantitation and the location of sulfur peaks for mass spectral identity and quantitation. Limit of quantitation for the PFPD and MSD was set at the least sensitive VSC (hydrogen sulfide) and determined to be 177 and 28 pg S, respectively, or 0.300 and 0.048 μg m −3 air, respectively. Storage stability of hydrogen sulfide and methanethiol was problematic in warm humid air (25 °C, 96% relative humidity (RH)) without being dried first, however, stability in canisters dried was still only 65% after 24 h of storage. Storage stability of hydrogen sulfide sampled in the field at a swine facility was over 2 days. The greater stability of field samples compared to laboratory samples was due to the lower temperature and RH of field samples compared to laboratory generated samples. Hydrogen sulfide was the dominant odorous VSCs detected at all swine facilities with methanethiol and dimethyl sulfide detected notably above their odor threshold values. The main odorous VSC detected in aged poultry litter was dimethyl trisulfide. Other VSCs above odor threshold values for poultry facilities were methanethiol and dimethyl sulfide. RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. AbstractVolatile sulfur compounds (VSCs) are a major class of chemicals associated with odor from animal feeding operations (AFOs). Identifying and quantifying VSCs in air is challenging due to their volatility, reactivity, and low concentrations. In the present study, a canister-based method collected whole air in fused silica-lined (FSL) mini-canister (1.4 L) following passage through a calcium chloride drying tube. Sampled air from the canisters was removed (10-600 mL), dried, preconcentrated, and cryofocused into a GC system with parallel detectors (mass spectrometer (MS) and pulsed flame photometric detector (PFPD)). The column effluent was split 20:1 between the MS and PFPD. The PFPD equimolar sulfur response enhanced quantitation and the location of sulfur peaks for mass spectral identity and quantitation. Limit of quantitation for the PFPD and MSD was set at the least sensitive VSC (hydrogen sulfide) and determined to be 177 and 28 pg S, respectively, or 0.300 and 0.048 mg m À3 air, respectively. S...

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Double-layer Tedlar bags: a means to limit humidity evolution of air samples and to dry humid air samples

Cited by 37 publications

References 15 publications

LISA: a lightweight stratospheric air sampler

LISA: a lightweight stratospheric air sampler

Suitability of different polymer bags for storage of volatile sulphur compounds relevant to breath analysis

Field sampling method for quantifying volatile sulfur compounds from animal feeding operations

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