Sorption and desorption study of a nerve-agent simulant from office materials for forensic applications

Primera-Pedrozo, Oliva M.; Fraga, Carlos G.; Breton-Vega, Angel; Zumbach, Madeline M.; Wilkins, Benjamin Paul; Mirjankar, Nikhil; Kennedy, Zachary C.

doi:10.1016/j.forc.2020.100260

“…Indeed several studies reported various effect of the presence of water on the absorption of DMMP by oxide materials, 41,42 and a recent study highlighted that the influence of water differs from one material to another. 43 In our experiments, a vapour pressure of 1 torr eq. À1 of water (approximately RH = 5%) was introduced in the cell for 10 minutes before exposing the sample to DMMP gas.…”

Section: Paper Materials Advancesmentioning

confidence: 92%

“…Indeed several studies reported various effect of the presence of water on the absorption of DMMP by oxide materials, 41,42 and a recent study highlighted that the influence of water differs from one material to another. 43 In our experiments, a vapour pressure of 1 torr/eq of water (approximately RH=5%) was introduced in the cell for 10 minutes before exposing the sample to DMMP gas. This experiment was performed on TiO 2 -Oxime since it presented a significant intensity of δ(P-CH 3 ) and the area of this peak was plotted in function of time for investigations.…”

Section: Materials Advances Accepted Manuscriptmentioning

confidence: 99%

Investigation of interactions between organophosphorus compounds and TiO₂ modified microcantilevers for molecule detection in air

Biapo

¹

,

Keller

²

,

Bazin

³

et al. 2022

Mater. Adv.

3

0

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“…The in-house IGC unit was one of two Agilent gas chromatography/mass spectrometry (GC/MS) systems, either an Agilent 7890A/5975C or Agilent 5890 series II/5971 (Agilent Technologies, Inc., Santa Clara, CA). Each GC/MS unit was configured for IGC by connecting a 4 mm i.d.…”

Section: Materials and Methodsmentioning

confidence: 99%

Physicochemical Gas–Solid Sorption Properties of Geologic Materials Using Inverse Gas Chromatography

Denis

¹

,

Fraga

²

,

Huggett

³

et al. 2021

Self Cite

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The goal of this study was to determine the physicochemical properties of a variety of geologic materials using inverse gas chromatography (IGC) by varying probe gas selection, temperature, carrier gas flow rate, and humidity. This is accomplished by measuring the level of interaction between the materials of interest and known probe gases. Identifying a material’s physicochemical characteristics can help provide a better understanding of the transport of gaseous compounds in different geologic materials or between different geological layers under various conditions. Our research focused on measuring the enthalpy (heat) of adsorption, Henry’s constant, and diffusion coefficients of a suite of geologic materials, including two soil types (sandy clay-loam and loam), quartz sand, salt, and bentonite clay, with various particle sizes. The reproducibility of IGC measurements for geologic materials, which are inherently heterogeneous, was also assessed in comparison to the reproducibility for more homogeneous synthetic materials. This involved determining the variability of physicochemical measurements obtained from different IGC approaches, instruments, and researchers. For the investigated IGC-determined parameters, the need for standardization became apparent, including the need for application-relevant reference materials. The inherent physical and chemical heterogeneities of soil and many geologic materials can make the prediction of sorption properties difficult. Characterizing the properties of individual organic and inorganic components can help elucidate the primary factors influencing sorption interactions in more complex mixtures. This research examined the capabilities and potential challenges of characterizing the gas sorption properties of geologic materials using IGC.

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“… 2 , 9 , 12 − 14 The range of values for the desorption diffusion coefficients across the literature is attributed primarily to differences in the types of polymer substrates as the uptake and mass transport of CWAs and CWA simulants in each substrate will vary depending on the intermolecular attractions and permeability of the system. 2 , 10 , 14 …”

Section: Introductionmentioning

confidence: 99%

“…2,9,12−14 The range of values for the desorption diffusion coefficients across the literature is attributed primarily to differences in the types of polymer substrates as the uptake and mass transport of CWAs and CWA simulants in each substrate will vary depending on the intermolecular attractions and permeability of the system. 2,10,14 Several novel studies employed alternative methods to measure uptake and sorption phenomena. Willis et al determined both the evaporation and absorption rate of liquid HD applied to a permeable silicone substrate by monitoring sessile drop profiles, calculating a sorption diffusion coefficient on the order of 10 −7 cm 2 /s.…”

Section: ■ Introductionmentioning

confidence: 99%

Vapor Sorption–Desorption Phenomena of HD and GB Simulants from Polyurethane Thin Films on Aluminum Oxide via a Quartz Crystal Microbalance

Kittle

¹

,

Grasdal

²

,

Kim

³

et al. 2022

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Protection and decontamination of surfaces after exposure to chemical warfare agents (CWAs) are of considerable interest to the homeland defense and battlespace operation communities. In this work, polyurethane was spin-coated onto aluminum oxide quartz crystal microbalance (QCM) sensors. Polyurethane film thickness was varied by altering the concentration of the polymer/chloroform solution used for spin-coating. Atomic force microscopy confirmed the formation of smooth, homogeneous films on the QCM sensor surface. Aluminum oxide QCM sensors coated with polyurethane were exposed to saturated vapors of dichloropentane (DCP), a mustard gas (HD) simulant, and dimethyl methylphosphonate (DMMP), a sarin gas (GB) simulant, and the mass uptake, diffusion coefficient, volume fraction, and partition coefficient of the simulant in the film were determined from QCM data. Results showed that both DCP and DMMP readily sorbed into the films although the mass uptake of DCP was greater than that of DMMP owing to DCP’s higher vapor pressure. Additionally, the CWA simulant uptake increased with polyurethane film thickness. Sorption diffusion coefficients were 1 × 10 –13 cm 2 /s and 1 × 10 –12 cm 2 /s for DCP and DMMP vapor, respectively. Simulant desorption was also measured and showed that some DMMP remained in the film/substrate system, while DCP sorption was fully reversible. Reversible desorption for both CWA simulants was relatively quick and independent over the range of film thicknesses studied, with average desorption diffusion coefficients of 2 × 10 –9 cm 2 /s and 1 × 10 –11 cm 2 /s for DCP and DMMP, respectively. Collectively, this study is expected to inform protection and decontamination strategies of equipment and structures upon exposure to CWAs.

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Sorption and desorption study of a nerve-agent simulant from office materials for forensic applications

Cited by 7 publications

References 37 publications

Investigation of interactions between organophosphorus compounds and TiO₂ modified microcantilevers for molecule detection in air

Investigation of interactions between organophosphorus compounds and TiO₂ modified microcantilevers for molecule detection in air

Physicochemical Gas–Solid Sorption Properties of Geologic Materials Using Inverse Gas Chromatography

Vapor Sorption–Desorption Phenomena of HD and GB Simulants from Polyurethane Thin Films on Aluminum Oxide via a Quartz Crystal Microbalance

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Sorption and desorption study of a nerve-agent simulant from office materials for forensic applications

Cited by 7 publications

References 37 publications

Investigation of interactions between organophosphorus compounds and TiO2 modified microcantilevers for molecule detection in air

Investigation of interactions between organophosphorus compounds and TiO2 modified microcantilevers for molecule detection in air

Physicochemical Gas–Solid Sorption Properties of Geologic Materials Using Inverse Gas Chromatography

Vapor Sorption–Desorption Phenomena of HD and GB Simulants from Polyurethane Thin Films on Aluminum Oxide via a Quartz Crystal Microbalance

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Product

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Investigation of interactions between organophosphorus compounds and TiO₂ modified microcantilevers for molecule detection in air

Investigation of interactions between organophosphorus compounds and TiO₂ modified microcantilevers for molecule detection in air