Quantum cascade laser-based photoacoustic sulfuryl fluoride sensing

Minini, Kariza Mayra Silva; Bueno, Sâmylla Cristina Espécie; Silva, Marcelo Gomes da; Sthel, Marcelo Silva; Vargas, H.; Angster, Judit; Miklós, András

doi:10.1007/s00340-017-6642-x

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…With the multi-pass absorption cell, a detection limit of 0.5 ppm was obtained with the SO 2 F 2 photoacoustic detector and 2 ppm with the R227ea photoacoustic detector. Although these detection limits are approximately two decades higher than those that can be achieved with resonant photoacoustic systems [ 25 , 29 ], our sensor is able to monitor the OEL in different applications in the future. A direct comparison with sensing devices relying on chemical principles (cf.…”

Section: Discussionmentioning

confidence: 96%

“…Generally, resonant devices can achieve such low detection limits, but they are much more complex and expensive than non-resonant sensors. Resonant photoacoustic sensors have already been proposed for SO 2 F 2 sensing but are restricted to laboratory use [ 24 , 25 , 26 , 27 , 28 ]. If the modulation of the light source is operated at a frequency that is much smaller than the smallest resonance frequency of the photoacoustic cell (PA) cell, this is referred to as non-resonant operation.…”

Section: Introductionmentioning

confidence: 99%

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Detection of SO2F2 Using a Photoacoustic Two-Chamber Approach

Yassine,

Weber,

Eberhardt

et al. 2023

Sensors

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The wide use of sulfuryl difluoride (SO2F2) for termite control in buildings, warehouses and shipping containers requires the implementation of suitable sensors for reliable detection. SO2F2 is highly toxic to humans and the environment, and moreover, it is a potent greenhouse gas. We developed two photoacoustic two-chamber sensors with the aim to detect two different concentration ranges, 0–1 vol.-% SO2F2 and 0–100 ppm SO2F2, so that different applications can be targeted: the sensor for high concentrations for the effective treatment of buildings, containers, etc., and the sensor for low concentrations as personal safety device. Photoacoustic detectors were designed, fabricated, and then filled with either pure SO2F2 or pure substituent gas, the refrigerant R227ea, to detect SO2F2. Absorption cells with optical path lengths of 50 mm and 1.6 m were built for both concentration ranges. The sensitivity to SO2F2 as well as cross-sensitivities to CO2 and H2O were measured. The results show that concentrations below 1 ppm SO2F2 can be reliably detected, and possible cross-sensitivities can be effectively compensated.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Detection of SO2F2 Using a Photoacoustic Two-Chamber Approach

Yassine,

Weber,

Eberhardt

et al. 2023

Sensors

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“…However, resonant systems are comparatively complex and expensive. Recently, different resonant photoacoustic systems have been introduced for SO 2 F 2 sensing [ 27 , 28 , 29 , 30 ], achieving such low detection limits. However, such systems are laboratory-based due to their size and complexity.…”

Section: Introductionmentioning

confidence: 99%

Towards a Miniaturized Photoacoustic Detector for the Infrared Spectroscopic Analysis of SO2F2 and Refrigerants

Yassine

Weber

Brugger

et al. 2022

Sensors

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Sulfuryl fluoride (SO2F2) is a toxic and potent greenhouse gas that is currently widely used as a fumigant insecticide in houses, food, and shipping containers. Though it poses a major hazard to humans, its detection is still carried out manually and only on a random basis. In this paper, we present a two-chamber photoacoustic approach for continuous SO2F2 sensing. Because of the high toxicity of SO2F2, the concept is to use a non-toxic substituent gas with similar absorption characteristics in the photoacoustic detector chamber, i.e., to measure SO2F2 indirectly. The refrigerants R227ea, R125, R134a, and propene were identified as possible substituents using a Fourier-transform infrared (FTIR) spectroscopic analysis. The resulting infrared spectra were used to simulate the sensitivity of the substituents of a photoacoustic sensor to SO2F2 in different concentration ranges and at different optical path lengths. The simulations showed that R227ea has the highest sensitivity to SO2F2 among the substituents and is therefore a promising substituent detector gas. Simulations concerning the possible cross-sensitivity of the photoacoustic detectors to H2O and CO2 were also performed. These results are the first step towards the development of a miniaturized, sensitive, and cost-effective photoacoustic sensor system for SO2F2.

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“…A significant advantage to using EDN as a fumigant is that, unlike the fumigants methyl bromide or sulfuryl fluoride, EDN is neither an atmospheric ozone depleting molecule nor is it a greenhouse gas [15,16].…”

Section: Introductionmentioning

confidence: 99%

Quantification of Ethanedinitrile in Air Using a New and Accurate Gas Chromatography Method

Brierley

Adlam

Hall

2018

MPs

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Compared to previously tested fumigants such as methyl bromide, sulfuryl fluoride and phosphine; ethanedinitrile (EDN) is a new fumigant which is being trialled around the world as a pre-plant soil treatment and as a quarantine and pre-shipment (QPS) treatment of commodities. To collect the data necessary to assess the effectiveness of this fumigant, an accurate analytical method is needed across a wide concentration range. We reviewed the methods of detection for EDN described in recently published fumigation studies and have developed and validated a method to quantify EDN in air using a gas chromatograph equipped with a flame ionization detector (GC–FID). Our tested method has a linearity, precision, accuracy, limit of detection (LOD) and limit of quantification (LOQ) of R2 0.9988, 1.36%, 98.8%, 0.750 ppm and 1.073 ppm, respectively. These values were determined using internationally recognised guidelines for the validation of non-standard analytical methods, which means that our method can be applied to the different validation requirements of regulatory agencies and countries. Our method can be used for experimental conditions that require detection at low and high concentrations simultaneously because it is accurate, fast (0.6 min) and repeatable across a concentration range of 1 to 40,000 ppm. This method will help to standardise the quantification of EDN by research groups and facilitate acceptance of data by regulatory organisations around the world.

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Quantum cascade laser-based photoacoustic sulfuryl fluoride sensing

Cited by 6 publications

References 17 publications

Detection of SO2F2 Using a Photoacoustic Two-Chamber Approach

Detection of SO2F2 Using a Photoacoustic Two-Chamber Approach

Towards a Miniaturized Photoacoustic Detector for the Infrared Spectroscopic Analysis of SO2F2 and Refrigerants

Quantification of Ethanedinitrile in Air Using a New and Accurate Gas Chromatography Method

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