Transportable, fast and high sensitive near real-time analyzers: Formaldehyde detection

Allouch, Alaa; Guglielmino, Maud; Bernhardt, Pierre; Serra, Christophe A.; Calvé, Stéphane Le

doi:10.1016/j.snb.2013.02.043

Cited by 110 publications

(57 citation statements)

References 37 publications

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“…Controlled gaseous formaldehyde concentrations were generated by a formaldehyde source previously developed in our laboratory [27,30] and operating typically at a total flow rate of 1500-2000 mL min −1 . This formaldehyde source was then connected to the instrument inlet using 6 mm PTFE tubing.…”

Section: First Generation Of Formaldehyde Analyzermentioning

confidence: 99%

Near Real-Time Monitoring of Formaldehyde in a Low-Energy School Building

et al. 2019

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The emergence of new super-insulated buildings to reduce energy consumption places the quality of indoor air at the center of the debate. Among the indoor air pollutants, aldehydes are often present, and formaldehyde is of major interest regarding its multiple sources and its health impact. Therefore, French regulations expect to reduce formaldehyde concentrations below 10 µg m −3 in public buildings by 2023. Formaldehyde and other aldehydes were measured for two weeks during an intensive field campaign conducted in a school recently built and equipped with programmable dual-flow ventilation. Aldehydes were monitored with the ISO 16000-3 reference method based on sampling with 2,4-dinitrophenylhydrazine (DNPH) tubes while formaldehyde concentration was continuously measured by using a sensitive near real-time formaldehyde microanalyzer with a detection limit of 1 µg m −3 . Formaldehyde was the major aldehyde. Its concentrations varied in the range of 2-25 µg m −3 and decreased by half when mechanical ventilation was ON, while the other ones were always below 5 µg m −3 . In addition, an excellent agreement was observed between the different analytical techniques deployed to quantify formaldehyde levels. The microanalyzer was able to measure fast variations of formaldehyde concentration in the studied room, according to the building's ventilation periods.

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Section: First Generation Of Formaldehyde Analyzermentioning

confidence: 99%

Near Real-Time Monitoring of Formaldehyde in a Low-Energy School Building

et al. 2019

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“…Furthermore, formaldehyde has been identified as a major cause of sick building syndrome (SBS), the sufferers exhibit a range of symptoms which appear to be related to the time spent in a particular building [11]. International Agency for Research on Cancer (IARC) determines that formaldehyde is carcinogenic to humans [12]. Consequently, the World Health Organization (WHO) limits exposure to 0.08 ppm (80 ppb) over 30 min [13], while the Chinese Environmental Protection Agency has set a 30 min exposure limit of 0.06 ppm [14].…”

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confidence: 99%

Thin-Film Sensors for Detection of Formaldehyde: A Review

Chen

Yuan

2015

IEEE Sensors J.

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This paper reviewed the films used in formaldehyde gas sensing recently. They can be divided into three groups: 1) metal oxide semiconductor films; 2) polymer films; and 3) carbon nanotubes (CNTs) films. Detection limits of these three groups were 1 ppb, 1 ppm, and 20 ppb, respectively. In metal-oxide-semiconductor films, the sensitivity of ZnO conductimetric type sensor was down to 1 ppb with the detectable response of 7.4. Polyethyleneimine/TiO 2 was the most sensitive film with quartz crystal microbalance sensor in polymer films, which could detect 1-ppm formaldehyde with the response ( f ) of 0.8 Hz. Either multi-wall CNTs (MWCNTs) or single-walled CNTs, forming a CNTs film, had the higher sensitivity so far, and the MWCNTs-NH 2 interdigital electrodes sensor exhibited 1.73% relative resistance change to 20 ppb of formaldehyde. The further research will be, however, needed to deal with the situation of real scenario influences, such as temperature, humidity, and interferents.

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“…By considering the baseline drift, we can combine equations (2) and (7) and obtain the relationship between sensor response and the formaldehyde concentration in the gas phase, given by sensor response = slope sampling − slope baseline (9) = K • K ad • C f ormaldehyde From equation (9) we can find that the sensor response is directly proportional to the concentration of formaldehyde in the gas sample. …”

Section: (4)mentioning

confidence: 99%

“…To overcome the drawbacks of the above detection technologies, various other approaches have been developed [7], but each has its own limitations. One of the approaches is based on photoionization detection (PID) [8], [9], which does not have the needed selectivity, and is prone to interference from a wide range of household products.…”

Section: Introductionmentioning

confidence: 99%

A Colorimetric Chemical Sensing Platform for Real-Time Monitoring of Indoor Formaldehyde

et al. 2015

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Formaldehyde is one of the most important indoor air pollutants affecting human immune system, and causing various respiratory diseases and even certain cancers. Traditional formaldehyde detection technologies are bulky, expensive and difficult to maintain. Here, we report a colorimetric chemical sensing platform for fast (2 min) and sensitive detection (30 ppbv) of formaldehyde over a wide dynamic range (0-750 ppbv). The sensor can tolerate humidity variation from 5% to 90% and is immune of common interferents, such as CO 2 (4%), SO 2 (10 ppm), NO 2 (125 ppbv), and O 3 (300 ppbv) in air. We also demonstrated continuous detection of formaldehyde on this sensing platform using disposable sensor chip.Index Terms-Colorimetric sensor, formaldehyde, gas sensor, indoor air quality.

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Transportable, fast and high sensitive near real-time analyzers: Formaldehyde detection

Cited by 110 publications

References 37 publications

Near Real-Time Monitoring of Formaldehyde in a Low-Energy School Building

Near Real-Time Monitoring of Formaldehyde in a Low-Energy School Building

Thin-Film Sensors for Detection of Formaldehyde: A Review

A Colorimetric Chemical Sensing Platform for Real-Time Monitoring of Indoor Formaldehyde

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