Quantification of the influence of NO2, NO and CO gases on the determination of formaldehyde and acetaldehyde using the DNPH method as applied to polluted environments

Williams, Jeanine; Li, Hu; Ross, Andrew B.; Hargreaves, Simon P.

doi:10.1016/j.atmosenv.2019.117019

Cited by 23 publications

(12 citation statements)

References 22 publications

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“…Thus, as described in Figure 5f, a HPLC technique was adopted as a quick evaluation approach through the in situ derivation of a carbonyl compound (i.e., HCHO) using a 2,4‐dinitrophenylhydrazine (DNPH) cartridge. [ 52 ] In general, the quantification of carbonyl compounds is accessible in the form of a non‐polar DNPH compound (HCHO‐DNP, ≈200 g mol −1 ) for the detection of low molecular weight aldehyde (≈30 g mol −1 ); [ 53,54 ] in this analytical method, acetonitrile was used as a compatible phase solvent that has the same retention time. Figure 5g shows a diagram of the HPLC chromatogram for the chemical separation facilitated by the MIP surface.…”

Section: Resultsmentioning

confidence: 99%

Rotating Cylinder‐Assisted Nanoimprint Lithography for Enhanced Chemisorbable Filtration Complemented by Molecularly Imprinted Polymers

Jeon

Park

Jeong

et al. 2021

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Rotating cylindrical stamp‐based nanoimprint technique has many advantages, including the continuous fabrication of intriguing micro/nanostructures and rapid pattern transfer on a large scale. Despite these advantages, the previous nanoimprint lithography has rarely been used for producing sophisticated nanoscale patterns on a non‐planar substrate that has many extended applications. Here, the simple integration of nanoimprinting process with a help of a transparent stamp wrapped on the cylindrical roll and UV optical source in the core to enable high‐throughput pattern transfer, particularly on a fabric substrate is demonstrated. Moreover, as a functional resin material, this innovative strategy involves a synergistic approach on the synthesis of molecularly imprinted polymer, which are spatially organized free‐standing perforated nanostructures such as nano/microscale lines, posts, and holes patterns on various woven or nonwoven blank substrates. The proposed materials can serve as a self‐encoded filtration medium for selective separation of formaldehyde molecules. It is envisioned that the combinatorial fabrication process and attractive material paves the way for designing next‐generation separation systems in use to capture industrial or household toxic substances.

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Section: Resultsmentioning

confidence: 99%

Rotating Cylinder‐Assisted Nanoimprint Lithography for Enhanced Chemisorbable Filtration Complemented by Molecularly Imprinted Polymers

Jeon

Park

Jeong

et al. 2021

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“…HPLC based on hydrazine derivatization is the most frequently used method, as the detection limit is exceedingly low (3 nM). However, the hydrazine agents may also react with NO, NO 2 in air, and other aldehydes, decreasing the accuracy and selectivity for HCHO quantification [115] …”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Challenges and Prospects in the Catalytic Conversion of Carbon Dioxide to Formaldehyde

et al. 2022

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Formaldehyde (HCHO) is a crucial C 1 building block for daily-life commodities in a wide range of industrial processes. Industrial production of HCHO today is based on energy-and cost-intensive gas-phase catalytic oxidation of methanol, which calls for exploring other and more sustainable ways of carrying out this process. Utilization of carbon dioxide (CO 2 ) as precursor presents a promising strategy to simultaneously mitigate the carbon footprint and alleviate environmental issues. This Minireview summarizes recent progress in CO 2 -to-HCHO conversion using hydrogenation, hydroboration/hydrosilylation as well as photochemical, electrochemical, photoelectrochemical, and enzymatic approaches. The active species, reaction intermediates, and mechanistic pathways are discussed to deepen the understanding of HCHO selectivity issues. Finally, shortcomings and prospects of the various strategies for sustainable reduction of CO 2 to HCHO are discussed. Chemical Catalysis Hydrogenation Using H 2Hydrogenation of CO 2 to value-added products is the most atom-efficient route for CO 2 transformation. So far, great

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“…Formaldehyde can be analysed by different methods. The firsts correspond to the reference method(s) widely used to quantify airborne formaldehyde levels and involve a passive or active sampling of gaseous formaldehyde on a DNPH tube [23][24][25] for several hours or even several days to produce the corresponding hydrazone followed by off-line laboratory HLPC/UV analysis [26][27][28][29]. If this analytical approach is time-consuming, the quantification is very simple since it only requires the calibration of the HPLC with the appropriate range of hydrazone solutions and sampling means, i.e., the gas flow rate for an active sampling.…”

Section: Introductionmentioning

confidence: 99%

Development of a Portable and Modular Gas Generator: Application to Formaldehyde Analysis

et al. 2022

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This work aims at developing and validating under laboratory-controlled conditions a gas mixture generation device designed for easy on-site or laboratory calibration of analytical instruments dedicated to air monitoring, such as analysers or sensors. This portable device, which has been validated for formaldehyde, is compact and is based on the diffusion of liquid formaldehyde through a short microporous interface with an air stream to reach non-Henry equilibrium gas–liquid dynamics. The geometry of the temperature-controlled assembly has been optimised to allow easy change of the aqueous solution, keeping the microporous tube straight. The formaldehyde generator has been coupled to an on-line formaldehyde analyser to monitor the gas concentration generated as a function of the liquid formaldehyde concentration, the temperature, the air gas flow rate, and the microporous tube length. Our experimental results show that the generated gaseous formaldehyde concentration increase linearly between 10 and 1740 µg m−3 with that of the aqueous solution ranging between 0 and 200 mg L−1 for all the gas flow rates studied, namely 25, 50 and 100 mL min−1. The generated gas phase concentration also increases with increasing temperature according to Henry’s law and with increasing the gas–liquid contact time either by reducing the gas flow rate from 100 to 25 mL min−1 or increasing the microporous tube length from 3.5 to 14 cm. Finally, the performances of this modular formaldehyde generator are compared and discussed with those reported in the scientific literature or commercialised by manufacturers. The technique developed here is the only one allowing to operate with a low flow rate such as 25 to 100 mL min−1 while generating a wide range of concentrations (10–1000 µg m−3) with very good accuracy.

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Quantification of the influence of NO2, NO and CO gases on the determination of formaldehyde and acetaldehyde using the DNPH method as applied to polluted environments

Abstract: This is a repository copy of Quantification of the influence of NO2, NO and CO gases on the determination of formaldehyde and acetaldehyde using the DNPH method as applied to polluted environments.

Cited by 23 publications

References 22 publications

Rotating Cylinder‐Assisted Nanoimprint Lithography for Enhanced Chemisorbable Filtration Complemented by Molecularly Imprinted Polymers

Rotating Cylinder‐Assisted Nanoimprint Lithography for Enhanced Chemisorbable Filtration Complemented by Molecularly Imprinted Polymers

Challenges and Prospects in the Catalytic Conversion of Carbon Dioxide to Formaldehyde

Development of a Portable and Modular Gas Generator: Application to Formaldehyde Analysis

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