Ultra-sensitive ethylene post-harvest monitor based on cavity ring-down spectroscopy

Wahl, E.H.; Tan, S. M.; Koulikov, S.; Kharlamov, B. M.; Rella, Christopher R.; Crosson, E.; Biswell, Dave; Paldus, Barbara A.

doi:10.1364/oe.14.001673

Cited by 48 publications

(25 citation statements)

References 8 publications

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“…A CRDS analyzer for C 2 H 4 (model G1106) was recently developed by the company Picarro (Santa Clara, CA, USA) to monitor ethylene production associated with post-harvest fruit ripening (Fidric et al 2003;Wahl et al 2006). We have applied the instrument to estimate N 2 fixation based on real-time estimates of acetylene reduction.…”

Section: Cavity Ring-down Spectroscopymentioning

confidence: 99%

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N2 fixation estimates in real-time by cavity ring-down laser absorption spectroscopy

et al. 2011

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The most common currency for estimating N(2) fixation is acetylene reduction to ethylene. Real-time estimates of nitrogen fixation are needed to close the global nitrogen budget and these remain a critical gap in both laboratory and field experiments. We present a new method for continuous real-time measurements of ethylene production: Acetylene Reduction Assays by Cavity ring-down laser Absorption Spectroscopy (ARACAS). In ARACAS, air in the headspace of an incubation chamber is circulated with a diaphragm pump through a cavity ring-down ethylene spectrometer and back to the incubation chamber. This paper describes the new approach and its benefits compared to the conventional detection of ethylene by flame ionization detector gas chromatography. First, the detection of acetylene reduction to ethylene is non-intrusive and chemically non-destructive, allowing for real-time measurements of nitrogenase activity. Second, the measurements are made instantaneously and continuously at ppb levels, allowing for observation of real-time kinetics on time intervals as short as a few seconds. Third, the instrument can be automated for long time periods of measurement. Finally, the technique will be widely accessible by the research community as it can be readily adapted to most existing acetylene reduction protocols and is based on a modestly priced, commercially available instrument. We illustrate its use for measuring N(2) fixation using two species, the diazotrophic bacterium Azotobacter vinelandii and the lichen Peltigera praetextata. We also discuss potential limitations of the approach, primarily the implications of leaks in the analyzer, as well as future improvements.

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Section: Cavity Ring-down Spectroscopymentioning

confidence: 99%

“…The instrument is insensitive to changes in ambient temperature, and interferences from CO 2 , methane and water. See Wahl et al (2006) and the Picarro website (http://picarro.com/) for further description of the analyzer, including wavelength range and type of laser.…”

Section: Cavity Ring-down Spectroscopymentioning

confidence: 99%

N2 fixation estimates in real-time by cavity ring-down laser absorption spectroscopy

et al. 2011

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“…Many of the initial measurements focused on small compounds. Field measurements have all been demonstrated for ethyne, (52,56 -58) ethene, (58,59) ethane, (60) and formaldehyde. (61) Measurements have been demonstrated for larger molecules; however, the rovibrational spectra of larger hydrocarbons become rapidly diffuse as the size of the compounds increase beyond two carbon atoms.…”

Section: Volatile Organic Compoundsmentioning

confidence: 98%

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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“…are mandatory. 6 Electro-catalytic sensors are sometimes used but they show saturation or wear and degradation problems without enough selectivity or accuracy.…”

Section: Introductionmentioning

confidence: 99%

Quartz-enhanced photoacoustic spectroscopy sensor for ethylene detection with a 3.32 μm distributed feedback laser diode

Triki

Desbrosses

et al. 2015

Review of Scientific Instruments

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An antimonide distributed feedback quantum wells diode laser operating at 3.32 μm at near room temperature in the continuous wave regime has been used to perform ethylene detection based on quartz enhanced photoacoustic spectroscopy. An absorption line centered at 3007.52 cm(-1) was investigated and a normalized noise equivalent absorption coefficient (1σ) of 3.09 10(-7) cm(-1) W Hz(-1/2) was obtained. The linearity and the stability of the detection have been evaluated. Biological samples' respiration has been measured to validate the feasibility of the detection setup in an agronomic environment, especially on ripening apples.

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Ultra-sensitive ethylene post-harvest monitor based on cavity ring-down spectroscopy

Cited by 48 publications

References 8 publications

N2 fixation estimates in real-time by cavity ring-down laser absorption spectroscopy

N2 fixation estimates in real-time by cavity ring-down laser absorption spectroscopy

Cavity Enhanced Spectroscopy: Applications Theory and Instrumentation

Quartz-enhanced photoacoustic spectroscopy sensor for ethylene detection with a 3.32 μm distributed feedback laser diode

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