Comparison of Methods for the Determination of Formaldehyde in Air

Giesen, Ruth; Schripp, Tobias; Markewitz, Doreen; Meyer, B.; Schwab, Harald; Uhde, Erik; Salthammer, Tunga

doi:10.1080/00032719.2015.1107083

Cited by 17 publications

(9 citation statements)

References 18 publications

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“…The existing measurement techniques for atmospheric HCHO are typically based either on mass spectrometry, wet chemistry, or spectroscopy. Given that the proton affinity of HCHO (713 kJ/mol) is only slightly higher than that of water (691 kJ/mol), the back reaction of water molecules with protonated HCHO leads to a low and strongly humidity-dependent sensitivity when measuring HCHO with proton transfer reaction mass spectrometry (PTR-MS). , Wet-chemistry methods include the use of 2,4-dinitrophenylhydrazine (DNPH) followed by high-performance liquid chromatography (HPLC) and the Hantzsch reaction followed by fluorimetric detection. , DNPH-HPLC is currently employed by the US EPA as a standard method and exhibits the lowest detection limit (40 pptv) among the methods mentioned above . However, the time resolution of DNPH-HPLC is typically >1 h, which may not be suitable to detect rapid changes in ambient air HCHO concentrations.…”

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confidence: 99%

Sensitive Detection of Ambient Formaldehyde by Incoherent Broadband Cavity Enhanced Absorption Spectroscopy

Liu

Yang

et al. 2020

Anal. Chem.

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Formaldehyde (HCHO) is the most abundant atmospheric carbonyl compound and plays an important role in the troposphere. However, HCHO detection via traditional incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS) is limited by short optical path lengths and weak light intensity. Thus, a new light-emitting diode (LED)-based IBBCEAS was developed herein to measure HCHO in ambient air. Two LEDs (325 and 340 nm) coupled by a Y-type fiber bundle were used as an IBBCEAS light source, which provided both high light intensity and a wide spectral fitting range. The reflectivity of the two cavity mirrors used herein was 0.99965 (1 − reflectivity = 350 ppm loss) at 350 nm, which corresponded with an effective optical path length of 2.15 km within a 0.84 m cavity. At an integration time of 30 s, the measurement precision (1σ) for HCHO was 380 parts per trillion volume (pptv), and the corresponding uncertainty was 8.3%. The instrument was successfully deployed for the first time in a field campaign and delivered results that correlated well with those of a commercial wet-chemical instrument based on Hantzsch fluorimetry (R 2 = 0.769). The combined light source based on a Y-type fiber bundle overcomes the difficulty of measuring ambient HCHO via IBBCEAS in near-ultraviolet range, which may extend IBBCEAS technology to measure other atmospheric trace gases with high precision.

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confidence: 99%

Sensitive Detection of Ambient Formaldehyde by Incoherent Broadband Cavity Enhanced Absorption Spectroscopy

Liu

Yang

et al. 2020

Anal. Chem.

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“…The MBTH method uses the reaction of 3-methyl-2-benzothiazolinonehydrazone with low molecular weight aliphatic aldehydes to form a corresponding azide. The resulting blue complex has a characteristic absorption maximum at 628 to 629 nm [37].…”

Section: -Methyl-2-benzothiazolone Hydrazonementioning

confidence: 99%

“…The method is used as a standard (e.g. VDI 3862-1) for the determination of formaldehyde (NCFS 2012) or the sum of aliphatic aldehydes (VDI 1990) [37]. The method also serves as a national standard test in China [38].…”

Section: -Methyl-2-benzothiazolone Hydrazonementioning

confidence: 99%

Review of Spectrophotometric Methods for Determination of Formaldehyde

Hladová

Martinka

Rantuch

et al. 2019

Research Papers Faculty of Materials Science and Technology Slovak University of Technology

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Formaldehyde is a toxic chemical commonly found in the environment. Owing to its increased usage, its incidence has also increased, and there is a need to determine the concentration of formaldehyde for the pollution control purposes. In general, spectrophotometric methods are easy to perform, low-cost, selective and sensitive, but every spectrophotometric method has its advantages and disadvantages, which are an important factor when selecting the method for determination of formaldehyde. Therefore, the aim of the research described in this paper was to compare the current spectrophotometric methods and to summarize their advantages and disadvantages.

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“…Several detection methods of formaldehyde were reported 7–9 and they are generally divided into traditional analysis methods and modern analysis methods. Traditional analytical methods were developed in the 1990s, which mainly include spectrophotometry, chromatography, and chemiluminescence analysis.…”

Section: Introductionmentioning

confidence: 99%