Portable system for near-real time measurement of gaseous formaldehyde by means of parallel scrubber stopped-flow absorptiometry

Toda, Kei; Yoshioka, Ken; Mori, Kotaro; Hirata, Shizuko

doi:10.1016/j.aca.2004.08.070

Cited by 72 publications

(46 citation statements)

References 44 publications

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“…Rapid and sensitive detection of volatile organic compounds (VOCs) in environmental or workplace air has received considerable attention, [1][2][3][4][5] and a variety of gas detector tubes are commercially available for hazardous and malodorous vapors. Chemoselective chromogenic detection of low concentration of analyte is of particular interest because of its high selectivity or analyte-specific molecular recognition as well as its simple utility (e.g., it is detectable by the naked eye).…”

Section: Introductionmentioning

confidence: 99%

“…Chemoselective chromogenic detection of low concentration of analyte is of particular interest because of its high selectivity or analyte-specific molecular recognition as well as its simple utility (e.g., it is detectable by the naked eye). Thus, highly selective and sensitive chromogenic detection of formaldehyde 2,3 and enzymatic detection of phenol vapors 6 have been developed, while a colorimetric sensing array for detection of a wide range of VOCs has been reported. 4 Analyte-specific molecular recognition has attracted much attention in biological and diagnostic aspects, e.g., a borate complex-based color sensor specific to catecholamines in blood and urine, 7 and a spiropyranbased color sensor specific to thiol-containing amino acids in neutral solution 8 have been developed.…”

Section: Introductionmentioning

confidence: 99%

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Color Sensors for Indole Vapors Based on Ehrlich-type Reactions

et al. 2009

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A sensitive and simple color sensor for indole vapors has been developed based on the Ehrlich-type reaction in solid polymer film. Upon 60-min exposure of the film sensor to the air containing 5 -100 ppb of indole vapors, pink or magenta color could be recognized by the naked eyes. Alternatively, a trial gas detector tube has been prepared by mixing the reagents with sea sand. When air (100 mL) was pumped through the detector tube, indole vapors above 20 ppb could be detected within 1 min. The sensing was selective to the vapors of indoles and pyrroles, and other VOCs or ambient moisture did not interfere.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Color Sensors for Indole Vapors Based on Ehrlich-type Reactions

et al. 2009

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“…The chromotropic acid (1,8- and can react easily with other aldehydes, and the sample solutions should be measured immediately after sampling due to the instability of the MBTH-formaldehyde intermediate [26,27]. The AHMT method needs a very strong base as the reaction medium, which is not desirable especially as carbonate formation will occur.…”

Section: Introductionmentioning

confidence: 99%

Development of novel detection reagent for simple and sensitive determination of trace amounts of formaldehyde and its application to flow injection spectrophotometric analysis

Li¹,

Sritharathikhum²,

Oshima³

et al. 2008

Analytica Chimica Acta

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“…20 The great advantage of the visual colorimetry is allowed a rapid decision about whether tap water passes the quality standard in Japan becomes feasible without any analytical instrument. Therefore, this method is very convenient for screening a sample before instrumental analysis.…”

Section: Introductionmentioning

confidence: 99%

Membrane Solubilization Technique for Spectrophotometric Determination of Trace Formaldehyde in Rainwater

et al. 2008

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A simple and sensitive spectrophotometry for formaldehyde in water by membrane solubilization technique was proposed. Formaldehyde was converted into a blue cationic dye with 3-methyl-2-benzothiazolinone hydrazone, and the dye was retained on a membrane filter as an ion-associate with tetraphenylborate anion. The filter retaining the blue dye was dissolved in 2-methoxyethanol containing sulfuric acid, and the absorbance of the solution was measured at 670 nm against the reagent blank. The formaldehyde from 0.007 to 0.2 mg L -1 was determined with an RSD of less than 5%, and the detection limit was 0.002 mg L -1 . The proposed method was very simple and rapid. Twenty minutes was sufficient for the entire analytical procedure. When the method was applied to rainwater, the analytical results were in good agreement with those obtained by GC/MS.

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Portable system for near-real time measurement of gaseous formaldehyde by means of parallel scrubber stopped-flow absorptiometry

Cited by 72 publications

References 44 publications

Color Sensors for Indole Vapors Based on Ehrlich-type Reactions

Color Sensors for Indole Vapors Based on Ehrlich-type Reactions

Development of novel detection reagent for simple and sensitive determination of trace amounts of formaldehyde and its application to flow injection spectrophotometric analysis

Membrane Solubilization Technique for Spectrophotometric Determination of Trace Formaldehyde in Rainwater

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