Trace detection of volatile organic compounds by diode laser cavity ring-down spectroscopy

Parkes, Alistair M.; Fawcett, Beth L.; Austin, Rachel; Nakamichi, Shinji; Shallcross, Dudley E.; Orr-Ewing, Andrew J.

doi:10.1039/b303834c

Cited by 23 publications

(26 citation statements)

References 30 publications

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“…Therefore, a lack of spectroscopic specificity precludes accurate and precise measurements of large hydrocarbons via CES with current technology. (62) Flask sampling, mass spectrometry, and gas chromatography remain the methods of choice for atmospheric measurements for a large variety of speciated hydrocarbons.…”

Section: Volatile Organic Compoundsmentioning

confidence: 99%

Cavity Enhanced Spectroscopy: Applications Theory and Instrumentation

Young

Washenfelder

Brown

2011

Encyclopedia of Analytical Chemistry

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Cavity‐enhanced spectroscopy (CES) is a sensitive technique for measuring the absolute optical extinction by samples that absorb or scatter light. Like other spectroscopic measurements, CES is based on measuring the change in intensity of light as it passes through an absorbing medium, CES is unique because it employs very long effective path lengths that are achieved by using highly reflective mirrors to form a high‐finesse optical cavity. A number of instrumental variations on this technique have been developed and successfully used to measure trace gas and aerosol concentrations in the atmosphere. CES is applicable to a wide range of atmospheric compounds with spectral absorptions. Detection limits vary with the application and molecule, but are typically of the order of parts per billion or parts per trillion in air.

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Section: Volatile Organic Compoundsmentioning

confidence: 99%

Cavity Enhanced Spectroscopy: Applications Theory and Instrumentation

Young

Washenfelder

Brown

2011

Encyclopedia of Analytical Chemistry

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“…The OrrEwing research group reported measurements of trace volatile organic compounds (VOCs), such as ethyne, ethene, 1,3-butadiene, 1-butadiene, 2-methylpropene using two DFB lasers and one ECDL in the NIR. (171) The detection limits of these VOCs are in the subparts per billion to a few parts per million levels. The same group combined a preconcentration technique typically used in gas chromatography (GC) with CW-CRDS and demonstrated the capability of measuring ethane in urban air at a mixture ratio level of 6 ppb.…”

Section: Environmental Applicationsmentioning

confidence: 99%

Cavity Ringdown Laser Absorption Spectroscopy

Wang

Miller

Winstead

2008

Encyclopedia of Analytical Chemistry

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Cavity ringdown spectroscopy (CRDS) has developed rapidly during the last two decades and has been implemented for a variety of applications ranging from fundamental spectroscopic studies, trace chemical detection for environmental monitoring, combustion flame chemistry and plasma diagnostics, elemental and isotopic measurements, breath gas analysis, and fiber ringdown chemical and physical sensor development. A host of chemical species, including atoms, ions, molecules, clusters, and free radicals, have been studied by CRDS. The experimental ringdown scheme has also evolved from an original mirror‐based format to various new forms for detection and analysis of analytes in either gas phase or liquid solutions. Recent research effort has also extended the CRDS approach for fiber optical sensor development. CRDS has become a mature spectrometric technique for a range of prototype and commercial instrumentation. This article provides a review of the latest developments in CRDS applications, specifically emphasizing new trends in elemental and isotopic analysis, plasma diagnostics, breath gas analysis, and new fiber ringdown techniques for sensor development. The introduction of cutting‐edge laser sources into CRDS methods, the combination of CRDS with conventional analytical tools, and current CRDS instrumentation are also briefly discussed.

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“…Impact of landfill sites on their vicinity are evaluated by VOC concentrations measurements: online monitoring methods using self-contained analyzers (Fourier Transform Infrared spectroscopy, Diode Laser Adsorption Spectroscopy or compact gas chromatography) [10][11][12][13][14][15], instantaneous samplings [2] or pre-concentration passive and active samplings with differed chromatography analysis can be set up [16]. Online monitoring provides high-time-resolution concentration data but implies heavy instruments ; Instantaneous sampling (in a plastic bag or canister) which can be done in multiple sampling points is easier to use but still questionable : it could be unrepresentative since samplings are taken in short periods (at most 1h) [2], induce some conservation difficulties and require for low concentrations measurements an additional pre-concentration step on SPME fibers [3,19] or on solid trap.…”

Section: Introductionmentioning

confidence: 99%

Improvement in 8h-sampling rate assessment considering meteorological parameters variability for biogas VOC passive measurements in the surroundings of a French landfill

Verriele

Allam

Depelchin

et al. 2015

Talanta

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Passive sampling technology has been extensively used for long-term VOC atmospheric concentrations' monitoring. Its performances regarding the short-term measurements and related to VOC from biogas were evaluated in this work: laboratory scale experiments have been conducted in order to check the suitability of Radiello® diffusive samplers for the assessment of 8 h-VOC levels in highly changeable meteorological conditions; in a second step a short pilot field campaign was implemented in the vicinity of a West-French landfill. First of all, it was assessed that amongst a diversified list of 16 characteristic compounds from biogas, mercaptans, some halogenated, oxygenated compounds and terpenes could not be measured accurately by this passive technique either because they are not captured by the sorbent or they are not quantitatively desorbed in the chosen mediated analytical conditions. Moreover, it has been confirmed that sampling rates (SR) related to isopentane, THF, cyclohexane, toluene, p-xylene and n-decane are influenced by environmental factors: the main influence concerns the wind speed. From 2 m s(-1), when the velocity increases by 1 m s(-1), the SR increases from 12 to 32% depending on the COV (considering a linear dependence between 2 and 7 m s(-1)). Humidity has no effect on SR, and temperature influence is rather limited to less than 3% per degree. A comprehensive uncertainty estimation, including uncertainties linked to meteorological changes, has led to global relative uncertainties comprising between 18% and 54% from one VOC to another: a quite high value comparatively to those obtained without considering meteorological condition influences. To illustrate our results, targeted VOC were quantified in the field, on a single day: concentrations range between LD to 3 µg m(-3): relatively very low concentrations compared to those usually reported by literature.

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Trace detection of volatile organic compounds by diode laser cavity ring-down spectroscopy

Cited by 23 publications

References 30 publications

Cavity Enhanced Spectroscopy: Applications Theory and Instrumentation

Cavity Enhanced Spectroscopy: Applications Theory and Instrumentation

Cavity Ringdown Laser Absorption Spectroscopy

Improvement in 8h-sampling rate assessment considering meteorological parameters variability for biogas VOC passive measurements in the surroundings of a French landfill

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