Continuous liquid-phase fluorometry coupled to a diffusion scrubber for the real-time determination of atmospheric formaldehyde, hydrogen peroxide and sulfur dioxide

Dasgupta, Purnendu Κ.; Dong, Shi; Hwang, Hyonseok; Yang, Hae Kyung; Zhang, Genfa

doi:10.1016/0004-6981(88)90273-9

Cited by 139 publications

(85 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(3) - (15). Therefore, Q is almost proportional to F in the low flow rate region, and constant at a high flow rate, as shown in Fig.…”

Section: ·2 Collected Analyte Quantity and Concentration In The Solumentioning

confidence: 77%

“…53 For more effective collection using an annular DS, a monofilament is inserted into a small-bore membrane tube. 15,47,54,55 Lee's group developed thin-layered annular DS by winding a channel around a large-bore tube. 27 This DS attains a 4 pptv limit of detection (LOD) with a sampling time of 10 min.…”

Section: ·2 Highly Effective Collectionmentioning

confidence: 99%

“…Dasgupta, the original inventor of the DS and of Asian descent, himself, has reported a variety of DS-based instrumentation. [14][15][16][17][18] In East Asia, DS devices and their applications have caught the scientific imagination. Many novel and interesting DS devices and their applications have been reported.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Toda

2004

ANAL. SCI.

View full text Add to dashboard Cite

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.

show abstract

“…(3) - (15). Therefore, Q is almost proportional to F in the low flow rate region, and constant at a high flow rate, as shown in Fig.…”

Section: ·2 Collected Analyte Quantity and Concentration In The Solumentioning

confidence: 77%

Section: ·2 Highly Effective Collectionmentioning

confidence: 99%

See 1 more Smart Citation

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

Toda

2004

ANAL. SCI.

View full text Add to dashboard Cite

show abstract

“…The comparison method chosen concentrates SO2 from the sample gas as S(IV) in an aqueous scrubber liquid by means of a membrane-based diffusion scrubber. 9 A solution of the enzyme sulfite oxidase then mixes with the continuously flowing stream of the scrubber effluent; this enzyme mediates the oxidation of S(IV) to sulfate by dissolved oxygen and simultaneously produces a stoichiometric amount of H2O2. The H2O2 thus produced is determined continuously by the peroxidase mediated oxidation of p-hydroxyphenylacetic acid by H2O2 to 6,6'-dihydroxybiphenyl-3,3'diacetic acid followed by addition of alkali to form a fluorescent product.…”

Section: Concentration Of the Mercurous Nitrate Solutionmentioning

confidence: 99%

“…The H2O2 thus produced is determined continuously by the peroxidase mediated oxidation of p-hydroxyphenylacetic acid by H2O2 to 6,6'-dihydroxybiphenyl-3,3'diacetic acid followed by addition of alkali to form a fluorescent product. 9 The complete method has been described elsewhere. 10 Although the method offers a detection limit of ~100 pptv, the operational cost is high due to the expensive sulfite oxidase enzyme and any H2O2 present in the sample gas interferes, typically positively.…”

Section: Concentration Of the Mercurous Nitrate Solutionmentioning

confidence: 99%

Measurement of Trace Levels of Atmospheric Sulfur Dioxide with a Gold Film Sensor

Hisamatsu

Liu

Dasgupta

1989

JAPCA

Self Cite

View full text Add to dashboard Cite

The atmospheric HCHO budget at Dumont d'Urville (East Antarctica): Contribution of photochemical gas‐phase production versus snow emissions

et al. 2013

View full text Add to dashboard Cite

HCHO was monitored throughout the year 2009 at the coastal East Antarctic site of Dumont d'Urville (DDU) using Aerolaser AL‐4021 analyzers. The accurate determination of less than 100 pptv required optimization of the analyzers, in particular, to minimize effects of changing ambient temperatures. The impact of station activities and of the presence of large penguin colonies at the site in summer was scrutinized. The obtained contamination‐free record indicates monthly means close to 50 pptv from May to September and a maximum of 200 pptv in January. Zero‐dimensional and 2‐D calculations suggest that in summer, the largest HCHO source is the gas‐phase photochemistry (80%) mainly driven by methane oxidation, which is considerably greater than from snow emissions (20%). The influence of light alkenes, dimethyl sulfide, and halogens remains weak. In winter, snow emissions represent the main HCHO source (70%). These findings are compared to previous studies conducted at the West Antarctic coast. It is shown that in summer the HCHO production from methane chemistry is 3 times more efficient at DDU than at the west coast due to more frequent arrival of oxidant‐rich air masses from inland Antarctica. Halogen chemistry is found to represent a weak HCHO sink at both West and East Antarctica. Compared to DDU, the shallower atmospheric boundary layer and the less efficient gas‐phase production at the west coast make the snow pack the dominant HCHO source (85%) compared to gas‐phase photochemistry (15%) there in summer.

show abstract

Continuous liquid-phase fluorometry coupled to a diffusion scrubber for the real-time determination of atmospheric formaldehyde, hydrogen peroxide and sulfur dioxide

Cited by 139 publications

References 39 publications

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

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

Measurement of Trace Levels of Atmospheric Sulfur Dioxide with a Gold Film Sensor

The atmospheric HCHO budget at Dumont d'Urville (East Antarctica): Contribution of photochemical gas‐phase production versus snow emissions

Contact Info

Product

Resources

About