Direct Measurement of Ammonia in Ambient Air

David, D. J.; Willson, M. C.; Ruffin, O. S.

doi:10.1080/00032717608067818

Cited by 35 publications

(15 citation statements)

References 2 publications

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“…One year later, David et al (1976) coated a cylindrical quartz rod with a layer consisting of polyvinylpyrrolidone and ninhydrin (2,2-dihydroxyindane-1,3-dione). They achieved detection limits in the ppb range for gaseous NH 3 , yet the reaction is irreversible.…”

Section: Introductionmentioning

confidence: 99%

Low-cost fiber-optic waveguide sensor for the colorimetric detection of ammonia

et al. 2011

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We present the development and characterization of a low-cost fiber-optic colorimetric gas sensor for ammonia combined with the electronic circuitry for measurement control and RFID communication. The gas sensor detects ammonia using a 300 μm polyolefin fiber coated with a gas-sensitive polymer film. The spectral and time-dependent sensitivity of various polymer films was tested in transmission measurements at λ = 590 nm. A prototype of the gas sensor was tested under realistic measurement conditions, i.e. battery-driven and in a completely autonomous mode. The sensor system showed good sensitivity to the ammonia concentrations and response times in the order of minutes. The achievable power consumption was below 100 μW. Bromophenol blue-based films showed a strong reaction to ammonia, with saturation concentrations around 1,000 ppm and response times of about 15 s to 100 ppm. The colorimetric reaction was simulated using a simple kinetic model which was in good agreement with the experimental results

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Section: Introductionmentioning

confidence: 99%

Low-cost fiber-optic waveguide sensor for the colorimetric detection of ammonia

et al. 2011

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“…Already in 1976 David et al reported about an idea regarding colorimetric detection of ammonia gas. The detection limit reached was very low, but the colorimetric reaction was irreversible 6 . A reversible reaction can be achieved by using pH indicators like bromophenol blue, bromocresol green, bromocresol blue, bromocresol purple or chlorophenol red [9][10][11][12][13] .…”

Section: Introductionmentioning

confidence: 94%

“…The detection of ammonia using colorimetry is widely described in literature [6][7][8][9][10][11][12][13][14][15] . Already in 1976 David et al reported about an idea regarding colorimetric detection of ammonia gas.…”

Section: Introductionmentioning

confidence: 99%

Colorimetric sensor for bad odor detection using automated color correction

et al. 2017

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Colorimetric sensors based on color-changing dyes offer a convenient approach for the quantitative measurement of gases. An integrated, mobile colorimetric sensor can be particularly helpful for occasional gas measurements, such as informal air quality checks for bad odors. In these situations, the main requirement is high availability, easy usage, and high specificity towards one single chemical compound, combined with cost-efficient production. In this contribution, we show how a well stablished colorimetric method can be adapted for easy operation and readout, making it suitable for the untrained end user. As an example, we present the use of pH indicators for the selective and reversible detection of NH3 in air (one relevant gas contributing to bad odors) using gas-sensitive layers dip coated on glass substrates. Our results show that the method can be adapted to detect NH3 concentrations lower than 1 ppm, with measure-to-result times in the range of a few minutes. We demonstrate that the color measurements can be carried out with the optical signals of RGB sensors, without losing quantitative performance.

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“…One year later, David et al 8 coated a cylindrical quartz rod with a layer consisting of polyvinylpyrrolidone and ninhydrin (2,2-dihydroxyindane-1,3-dione). They achieved detection limits in the ppb range for gaseous NH 3 , yet the reaction is irreversible.…”

Section: Introductionmentioning

confidence: 99%

Optical fiber waveguide sensor for the colorimetric detection of ammonia

et al. 2011

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We present the development and characterization of a fiber-optic colorimetric gas sensor combined with the electronic circuitry for measurement control and RFID communication. The gas sensor detects ammonia using a 300 µm polyolefin fiber coated with a gas-sensitive polymer film. The spectral and time-dependent sensitivity of various polymer films was tested in transmission measurements. Light from a standard LED at Lambda = 590 nm was coupled into the polyolefin fiber through the front face. A prototype of the gas sensor with the direct coupling method was tested under realistic measurement conditions, i.e. battery-driven and in a completely autonomous mode. The sensor system showed good sensitivity to the ammonia concentrations and response times in the order of minutes. The achieva ble power consumption was below 100μW.The films contained the pH-sensitive dyes bromocresol purple or bromophenol blue embedded in either ethyl cellulose or polyvinyl butyral, and optionally tributyl phosphate as plasticizer. The bromophenol blue based films showed a strong reaction to ammonia, with saturation concentrations around 1000 ppm and response times of about 15 seconds to 100ppm. The colorimetric reaction was simulated using a simple kinetic model which was in good agreement with the experimental results

show abstract

Direct Measurement of Ammonia in Ambient Air

Cited by 35 publications

References 2 publications

Low-cost fiber-optic waveguide sensor for the colorimetric detection of ammonia

Low-cost fiber-optic waveguide sensor for the colorimetric detection of ammonia

Colorimetric sensor for bad odor detection using automated color correction

Optical fiber waveguide sensor for the colorimetric detection of ammonia

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