Miniature open channel scrubbers for gas collection

Toda, Kei; Koga, Tomoko; Tanaka, Toshinori; Ohira, Shin Ichi; Berg, Jordan M.; Dasgupta, Purnendu Κ.

doi:10.1016/j.talanta.2010.08.001

Cited by 14 publications

(13 citation statements)

References 34 publications

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“…Assuming that the PPWD walls and the DS inner tubing are perfect sinks for target gases, the ideal CE of both collectors was estimated by the spreadsheets that Berg et al 19 and Toda et al 20 newly developed. We obtained a theoretical CE of each gas by entering the collectors dimensions (42 cm length and 6.0 cm width in active wall area, 0.30 cm distance between the walls for PPWD, 45 cm length and 0.13 cm outside radius in active tubing, 0.575 cm inside radius in inert tubing for DS) and the gas diffusion coefficients (0.132 cm 2 21,22 in the spreadsheets.…”

Section: Comparison Of Ppwd With the Ds-gas Collection Efficiency-mentioning

confidence: 99%

See 1 more Smart Citation

Parallel-Plate Wet Denuder Coupled Ion Chromatograph for Near-Real-Time Detection of Trace Acidic Gases in Clean Room Air

et al. 2011

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Section: Comparison Of Ppwd With the Ds-gas Collection Efficiency-mentioning

confidence: 99%

“…The gaseous molecules need to diffuse through the pores. Toda et al 20,23 reported that the CE of SO2 and H2S differed significantly between membranes of pPTFE, expanded PTFE, Nafion, porous polypropylene, and silicone. At 0.5 dm 3 min -1 , our experimental SO2 CE of DS was 60.8 ± 2.1%.…”

Section: Comparison Of Ppwd With the Ds-gas Collection Efficiency-mentioning

confidence: 99%

Parallel-Plate Wet Denuder Coupled Ion Chromatograph for Near-Real-Time Detection of Trace Acidic Gases in Clean Room Air

et al. 2011

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“…Miniature systems based on open channels that do not rely on any membrane structure have also been reported [17,18]. These systems provide an effective way to establish a large gas-liquid interface area and eliminate issues related with membranes.…”

Section: Introductionmentioning

confidence: 99%

A Miniature Gas Sampling Interface with Open Microfluidic Channels: Characterization of Gas-to-Liquid Extraction Efficiency of Volatile Organic Compounds

2019

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Chemosensory protein based olfactory biosensors are expected to play a significant role in next-generation volatile organic compound (VOC) detection systems due to their ultra-high sensitivity and selectivity. As these biosensors can perform most efficiently in aqueous environments, the detection systems need to incorporate a gas sampling interface for gas-to-liquid extraction. This interface should extract the VOCs from the gas phase with high efficiency and transfer them into the liquid containing biosensors to enable subsequent detection. To design such a transfer interface, an understanding of the key parameters influencing the gas-to-liquid extraction efficiency of target VOCs is crucial. This paper reports a gas sampling interface system based on a microfluidic open-channel device for gas-to-liquid extraction. By using this device as a model platform, the key parameters dictating the VOC extraction efficiency were identified. When loaded with 30 μL of capture liquid, the microfluidic device generates a gas-liquid interface area of 3 cm2 without using an interfacial membrane. The pumpless operation based on capillary flow was demonstrated for capture liquid loading and collection. Gas samples spiked with lipophilic model volatiles (hexanal and allyl methyl sulfide) were used for characterization of the VOC extraction efficiency. Decreasing the sampling temperature to 15 °C had a significant impact on increasing capture efficiency, while variation in the gas sampling flow rate had no significant impact in the range between 40–120 mL min−1. This study found more than a 10-fold increase in capture efficiency by chemical modification of the capture liquid with alpha-cyclodextrin. The highest capture efficiency of 30% was demonstrated with gas samples spiked with hexanal to a concentration of 16 ppm (molar proportion). The approach in this study should be useful for further optimisation of miniaturised gas-to-liquid extraction systems and contribute to the design of chemosensory protein-based VOC detection systems.

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“…Ion chromatography (IC) has also proven to be useful for both gas-and particle-phase ammonia and amines (Gibb et al, 1999;Hiranuma et al, 2010;Orsini et al, 2003;Praplan et al, 2012;VandenBoer et al, 2011). Formation of an indophenol complex which is measured spectrometrically has been developed for ammonia (Scheiner, 1976;Solórzano, 1969), as have various techniques involving the formation of 1-sulfonatoisoindole followed by fluorescence measurement (Toda et al, 2010;Zhang et al, 1989). For atmospheric ammonia measurement techniques, several intercomparison studies, in both field and laboratory settings, have been reported in the literature (von Bobrutzki et al, 2010;Fehsenfeld et al, 2002;Kirchner et al, 1999;Norman et al, 2009;Schwab et al, 2007;Wiebe et al, 1990;Williams et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Measurement of gas-phase ammonia and amines in air by collection onto an ion exchange resin and analysis by ion chromatography

et al. 2014

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Abstract. Ammonia and amines are common trace gases in the atmosphere and have a variety of both biogenic and anthropogenic sources, with a major contribution coming from agricultural sites. In addition to their malodorous nature, both ammonia and amines have been shown to enhance particle formation from acids such as nitric, sulfuric and methanesulfonic acids, which has implications for visibility, human health and climate. A key component of quantifying the effects of these species on particle formation is accurate gasphase measurements in both laboratory and field studies. However, these species are notoriously difficult to measure as they are readily taken up on surfaces, including onto glass surfaces from aqueous solution as established in the present studies. We describe here a novel technique for measuring gas-phase ammonia and amines that involves uptake onto a weak cation exchange resin followed by extraction and analysis using ion chromatography. Two variants -one for parts per billion concentrations in air and the second with lower (parts per trillion) detection limits -are described. The latter involves the use of a custom-designed high-pressure cartridge to hold the resin for in-line extraction. These methods avoid the use of sampling lines, which can lead to significant inlet losses of these compounds. They also have the advantages of being relatively simple and inexpensive. The applicability of this technique to ambient air is demonstrated in measurements made near a cattle farm in Chino, CA.

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Miniature open channel scrubbers for gas collection

Cited by 14 publications

References 34 publications

Parallel-Plate Wet Denuder Coupled Ion Chromatograph for Near-Real-Time Detection of Trace Acidic Gases in Clean Room Air

Parallel-Plate Wet Denuder Coupled Ion Chromatograph for Near-Real-Time Detection of Trace Acidic Gases in Clean Room Air

A Miniature Gas Sampling Interface with Open Microfluidic Channels: Characterization of Gas-to-Liquid Extraction Efficiency of Volatile Organic Compounds

Measurement of gas-phase ammonia and amines in air by collection onto an ion exchange resin and analysis by ion chromatography

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