Measurement of atmospheric formaldehyde with a diffusion scrubber and light‐emitting diode–liquid‐core waveguide based fluorometry

Li, Jianzhong; Dasgupta, Purnendu Κ.; Zhang, Genfa; Hutterli, Manuel A.

doi:10.1002/fact.1001

Cited by 54 publications

(56 citation statements)

References 50 publications

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“…A commercial, wet-chemical instrument (Methanalyser, Alpha Omega Power Technologies, Model MA-100, Albuquerque, New Mexico, USA) was deployed for HCHO measurements (Li et al, 2001;Fan and Dasgupta, 1994). The instrument consists of a Nafion-membrane diffusion scrubber integrated with an automated, liquid reactor.…”

Section: Hantzsch Ma-100 (Iup-ub)mentioning

confidence: 99%

Technical Note: Intercomparison of formaldehyde measurements at the atmosphere simulation chamber SAPHIR

Wisthaler

Apel

Bossmeyer³

et al. 2008

Atmos. Chem. Phys.

108

106

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Abstract. The atmosphere simulation chamber SAPHIR at the Research Centre Jülich was used to test the suitability of state-of-the-art analytical instruments for the measurement of gas-phase formaldehyde (HCHO) in air. Five analyzers based on four different sensing principles were deployed: a differential optical absorption spectrometer (DOAS), cartridges for 2,4-dinitrophenylhydrazine (DNPH) derivatization followed by off-line high pressure liquid chromatography (HPLC) analysis, two different types of commercially available wet chemical sensors based on Hantzsch fluorimetry, and a proton-transfer-reaction mass spectrometer (PTR-MS). A new optimized mode of operation was used for the PTR-MS instrument which significantly enhanced its performance for online HCHO detection at low absolute humidities.The instruments were challenged with typical ambient levels of HCHO ranging from zero to several ppb. Synthetic air of high purity and particulate-filtered ambient air were used as sample matrices in the atmosphere simulation chamber onto which HCHO was spiked under varying levels of humidity and ozone. Measurements were compared to mixing ratios calculated from the chamber volume and the known amount of HCHO injected into the chamber; measurements were also compared between the different instruments. The formal and blind intercomparison exercise was conducted Correspondence to: T. Brauers (th.brauers@fz-juelich.de) under the control of an independent referee. A number of analytical problems associated with the experimental set-up and with individual instruments were identified, the overall agreement between the methods was fair.

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Section: Hantzsch Ma-100 (Iup-ub)mentioning

confidence: 99%

Technical Note: Intercomparison of formaldehyde measurements at the atmosphere simulation chamber SAPHIR

Wisthaler

Apel

Bossmeyer³

et al. 2008

Atmos. Chem. Phys.

108

106

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“…This detector has been used for fluorometry 67,68 and chemiluminescence measurements 69 of H2O2 and hydroxymethyl hydroperoxide, and fluorometry of HCHO. 70,71 LODs of 10 -30 pptv have been obtained for continuous or near real-time measurements.…”

Section: ·5 Detection Methods For Collected Species Ii: Miniaturementioning

confidence: 99%

“…71 In Japan, there are similar projects. Background levels of acidic atmospheric gases were measured at Oki and Rishiri islands, and daily fluctuations of sub-ppbv levels were obtained.…”

Section: ·6 Applications For Atmospheric Trace Gas Analysismentioning

confidence: 99%

Trends in Atmospheric Trace Gas Measurement Instruments with Membrane-based Gas Diffusion Scrubbers

Toda

2004

ANAL. SCI.

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A diffusion scrubber (DS) is an excellent tool for gas analysis, and there are many types of DS devices, varying both in structure and construction. In this paper, recent work on atmospheric trace gas measurements by means of DS devices are reviewed. Theoretical considerations on representative DSs are summarized first. Then, the characteristics of the key material, a gas-diffusion membrane, are discussed, and recent improvements and novel scrubbers for highly effective collection are outlined. A chromatograph is a suitable tool for the multi-gas analysis of collected species. On the other hand, solid-state fluorescence/absorbance detectors have been developed for the continuous measurement of target gases. The methods based on DS collection and subsequent detection have high sensitivities, and the detection limits can be in the low-pptv levels. Accordingly, they are capable of measuring background levels, and detecting very low levels of contaminants in a cleanroom. Miniaturized advanced DS units, perhaps the next generation of DS devices, are introduced at the end of this review. DS systems have contributed significantly to our knowledge of the atmospheric dynamics and atmospheric chemistry.

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“…Intercomparisons among various formaldehyde detection methods have also been carried out in Gilpin et al (1997) and Cárdenas et al (2000). Although formaldehyde can also be a challenge to analyse, over the last 20 years high quality measurements of formaldehyde have been established using wet-chemical techniques Dasgupta, 1986, 1987;Fan and Dasgupta, 1994;Heikes et al, 1996;Dasgupta et al, 1988Dasgupta et al, , 1998Dasgupta et al, , 1999Li et al, 2001). Such instruments are relatively inexpensive, have a detection limit in the mid-ppt (parts per trillion) range, are commercially available, run essentially continuously, and are highly selective for formaldehyde.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric methanol measurement using selective catalytic methanol to formaldehyde conversion

et al. 2005

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Abstract.A novel atmospheric methanol measurement technique, employing selective gas-phase catalytic conversion of methanol to formaldehyde followed by detection of the formaldehyde product, has been developed and tested. The effects of temperature, gas flow rate, gas composition, reactor-bed length, and reactor-bed composition on the methanol conversion efficiency of a molybdenum-rich, ironmolybdate catalyst [Mo-Fe-O] were studied. Best results were achieved using a 1:4 mixture (w/w) of the catalyst in quartz sand. Optimal methanol to formaldehyde conversion (>95% efficiency) occurred at a catalyst housing temperature of 345 • C and an estimated sample-air/catalyst contact time of <0.2 seconds. Potential interferences arising from conversion of methane and a number of common volatile organic compounds (VOC) to formaldehyde were found to be negligible under most atmospheric conditions and catalyst housing temperatures. Using the new technique, atmospheric measurements of methanol were made at the University of Bremen campus from 1 to 15 July 2004. Methanol mixing ratios ranged from 1 to 5 ppb with distinct maxima at night. Formaldehyde mixing ratios, obtained in conjunction with methanol by periodically bypassing the catalytic converter, ranged from 0.2 to 1.6 ppb with maxima during midday. These results suggest that selective, catalytic methanol to formaldehyde conversion, coupled with existing formaldehyde measurement instrumentation, is an inexpensive and effective means for monitoring atmospheric methanol.

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Measurement of atmospheric formaldehyde with a diffusion scrubber and light‐emitting diode–liquid‐core waveguide based fluorometry

Cited by 54 publications

References 50 publications

Technical Note: Intercomparison of formaldehyde measurements at the atmosphere simulation chamber SAPHIR

Technical Note: Intercomparison of formaldehyde measurements at the atmosphere simulation chamber SAPHIR

Trends in Atmospheric Trace Gas Measurement Instruments with Membrane-based Gas Diffusion Scrubbers

Atmospheric methanol measurement using selective catalytic methanol to formaldehyde conversion

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