Development of a monitoring tape for nitrogen dioxide in air

Nakano, Nobuo

doi:10.1016/0003-2670(95)00560-9

Cited by 12 publications

(12 citation statements)

References 9 publications

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“…The concentration versus response exhibited two distinctly different linear regions with a drastic change in slope. 21 With a sampling interval of 10 min, the best LOD that could be attained was 1 ppbv. Our initial experiments with G-S reagents were also disappointing; the response was too slow.…”

Section: Resultsmentioning

confidence: 97%

“…Of note is the use of Griess-Saltzman (G-S) reagent for monitoring NO 2 . 21 The sample gas is generally drawn through the porous filter tape. There is one report where the gas is not drawn through the filter but the gas impinges on the filter that is impregnated with silica gel to increase reagent impregnation capacity.…”

Section: Resultsmentioning

confidence: 99%

“…This is not an insurmountable deterrent, filter tape samplers are in common use. [17][18][19][20][21] We show here a sensitive sensor based on a unique chemistry that responds sensitively to both NO 2 and O 3 and is reusable several times at typical ambient concentrations before a new area must be used.…”

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confidence: 99%

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Fiber Optic Sensor for Simultaneous Determination of Atmospheric Nitrogen Dioxide, Ozone, and Relative Humidity

2009

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We describe a novel optical sensor for the simultaneous measurement of atmospheric nitrogen dioxide (NO(2)), ozone (O(3)), and relative humidity (RH). A transparent backing thin layer silica gel chromatographic plate impregnated with 8-amino-1-naphthol-5-sulfonic acid (ANS) is used as the collection/sensor element. The plate transmittance is probed by three discrete light emitting diodes (LEDs) centered, respectively, at 442, 525, and 850 nm. The transmission of the plate changes reversibly across visible to NIR wavelengths as the RH around the plate changes; this is the basis for a limited-resolution RH sensor. The ANS on the plate reacts to form brown and pink colored products, respectively, when it reacts with NO(2) and O(3). The sample air impinges on the plate via an entrance nozzle. The LEDs are alternately turned on in a preprogrammed manner and the light is brought to the impregnated face of the plate by a three-legged fiber optic. The transmitted light is detected on the obverse side of the plate. The 850 nm signal provides the RH value and optionally serves as the reference measurement for the other two wavelengths; the NO(2) and O(3) reaction products do not absorb at this wavelength. The absorbance at 442 and 525 nm, thus referenced against 850 nm, are used to obtain NO(2) and O(3) concentrations from a pair of simultaneous equations. For a sampling period of 5 min, the limits of detection (LOD) based on 3 times the standard deviation of blank responses were 0.64 and 0.42 ppbv for NO(2) and O(3), respectively. Data obtained with collocated commercial instruments (O(3) induced chemiluminescence analyzer for NO(2) and UV-absorption for O(3)) show good agreement. Overall, this provides a viable affordable approach for inexpensive measurement of atmospheric NO(2) and O(3).

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Fiber Optic Sensor for Simultaneous Determination of Atmospheric Nitrogen Dioxide, Ozone, and Relative Humidity

2009

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“…The pump is set downstream from the main body to pull the NO 2 through the main body to prevent contamination by the pump. The gas flow direction is shown by symbol [3], Figure 1A. Because the flow-rate during sampling affects the intensity of the sensor color change, the flow-meter for constant flow of sample gas must be set prior to the pump.…”

Section: Methodsmentioning

confidence: 99%

“…Even though these are considered sensitive and accurate, they are too expensive, fragile and complicated to be used as instruments on-site tests. Other devices include badges, tapes, and tubes to capture the NO x for subsequent colorimetric analysis (3,4). Their disadvantage is that they cannot be utilized to monitor real-time NO x concentrations in the field.…”

Section: Development Of the Systemmentioning

confidence: 99%

A Low-Cost System for Measuring ppb-Level NO₂

Oh¹

2005

Beiträge Zur Tabakforschung International/Contributions to Tobacco Research

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SUMMARYA low-cost system to measure low-level nitrogen dioxide (NO 2 ) in an atmosphere was developed. Its major component included a sensor comprising filter paper treated with 3,3'-dimethylbenzidine (o-tolidine), a compound that reacts with NO 2 to generate color proportional to the NO 2 contacted. In addition to the system development, its utility was optimized and the characteristics of the sensor were defined. Originally developed to determine the NO 2 levels during direct-fired tobacco curing, the system may be used to determine the NO 2 levels in other situations. [Beitr. Tabakforsch. Int. 21 (2005)

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Metallo-porphyrin zinc as gas sensitive material for colorimetric gas sensors on planar optical waveguides

et al. 2012

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The presented work focuses on the investigations of a metallo-porphyrin and its gasochromic behavior to different gases. Gasochromic materials change their color while they are exposed to a certain gas. So they offer the possibility to develop highly selective chemical gas sensors and gas sensing systems. The focus of this work is the characterization of the metallo-porphyrin 5, 10, 15, 20-tetraphenylporphyrin-zinc (ZnTPP). Nonetheless, there is a wide range of other possible metallo-porphyrins. When embedded into a polymeric matrix (PVC) a color change to the toxic gas NO2 can be detected. To develop a stand-alone gas sensor, the porphyrin/PVC matrix is deposited onto a planar optical waveguide. The color change of the porphyrin dye can be detected in the evanescent field of the optical w aveguide. Therefore, the light of a high power LED is coupled into the waveguide. The color change of the porphyrin is detectable with photodiodes as a variation of the out-coupled light intensity. The sensor shows no unwished sensitivities to CO2 and CO and only low to NH3. NO2 is detectable with a resolution of 1 ppm

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Development of a monitoring tape for nitrogen dioxide in air

Cited by 12 publications

References 9 publications

Fiber Optic Sensor for Simultaneous Determination of Atmospheric Nitrogen Dioxide, Ozone, and Relative Humidity

Fiber Optic Sensor for Simultaneous Determination of Atmospheric Nitrogen Dioxide, Ozone, and Relative Humidity

A Low-Cost System for Measuring ppb-Level NO₂

Metallo-porphyrin zinc as gas sensitive material for colorimetric gas sensors on planar optical waveguides

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Development of a monitoring tape for nitrogen dioxide in air

Cited by 12 publications

References 9 publications

Fiber Optic Sensor for Simultaneous Determination of Atmospheric Nitrogen Dioxide, Ozone, and Relative Humidity

Fiber Optic Sensor for Simultaneous Determination of Atmospheric Nitrogen Dioxide, Ozone, and Relative Humidity

A Low-Cost System for Measuring ppb-Level NO2

Metallo-porphyrin zinc as gas sensitive material for colorimetric gas sensors on planar optical waveguides

Contact Info

Product

Resources

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A Low-Cost System for Measuring ppb-Level NO₂