Application of head-space analysis to the study of volatile organic impurity concentrates

Ioffe, B. V.; Vitenberg, A. G.; Tsibul'skaya, I. A.

doi:10.1016/s0021-9673(00)95300-7

Cited by 10 publications

(9 citation statements)

References 5 publications

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“…We extracted dissolved gases from the water samples using headspace equilibration . The headspace equilibration was conducted at room temperature by injecting 20 mL of ultra high purity dinitrogen (N 2 ) into the sample serum vial, while allowing an equivalent volume of water to be displaced from the bottle through a vent needle.…”

Section: Methodsmentioning

confidence: 99%

High Methane Emissions from a Midlatitude Reservoir Draining an Agricultural Watershed

Beaulieu

Smolenski

Nietch

et al. 2014

Environ. Sci. Technol.

105

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Reservoirs are a globally significant source of methane (CH4), although most measurements have been made in tropical and boreal systems draining undeveloped watersheds. To assess the magnitude of CH4 emissions from reservoirs in midlatitude agricultural regions, we measured CH4 and carbon dioxide (CO2) emission rates from William H. Harsha Lake (Ohio, U.S.A.), an agricultural impacted reservoir, over a 13 month period. The reservoir was a strong source of CH4 throughout the year, emitting on average 176 ± 36 mg C m(-2) d(-1), the highest reservoir CH4 emissions profile documented in the United States to date. Contrary to our initial hypothesis, the largest CH4 emissions were during summer stratified conditions, not during fall turnover. The river-reservoir transition zone emitted CH4 at rates an order of magnitude higher than the rest of the reservoir, and total carbon emissions (i.e., CH4 + CO2) were also greater at the transition zone, indicating that the river delta supported greater carbon mineralization rates than elsewhere. Midlatitude agricultural impacted reservoirs may be a larger source of CH4 to the atmosphere than currently recognized, particularly if river deltas are consistent CH4 hot spots. We estimate that CH4 emissions from agricultural reservoirs could be a significant component of anthropogenic CH4 emissions in the U.S.A.

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Section: Methodsmentioning

confidence: 99%

High Methane Emissions from a Midlatitude Reservoir Draining an Agricultural Watershed

Beaulieu

Smolenski

Nietch

et al. 2014

Environ. Sci. Technol.

105

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“…One of them is the ease of changing the indium oxidation state within a significant range without structure restructuring and the occurrence of electronic exchange between them: In 2+ – In + + In 3+ . The second factor is the presence of indium oxide which is obtained by the sol–gel method of the complex structural defects in the form of oxygen vacancies in interaction with partially reduced states of indium (In 2+ , In + ). – Such defects are effective centers of adsorption and catalysis, which proceeds according to the associative mechanism through the formation of intermediate complexes from adsorbed molecules and oxygen…”

Section: Resultsmentioning

confidence: 99%

Sensors Based on Tin and Indium Oxides for the Determination of Acetone in Human Breath

Kimakova,

Kondrakhova,

Ovodok

et al. 2023

ACS Omega

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The properties of planar sensors based on tin dioxide and indium oxide used for the determination of acetone vapors have been studied. Sensors based on synthesized SnO2 and In2O3 nanopowders showed high sensitivity to low concentrations of acetone in a humid environment which simulates human exhalation. The addition of a small amount of AuIII ions to hydroxide sols significantly increases the threshold sensitivity and the sensor response in a wide range of acetone concentrations. In2O3–Au sensors have the maximum sensitivity at an operating temperature of 325 °C. The In2O3–Au-sensors reliably record the change in acetone concentration in the concentration range from a minimum of 0.1 to 5 ppm with high accuracy, which is necessary for rapid diagnostics of the condition of patients with diabetes (1.8–5.0 ppm). The high sensitivity of the obtained sensors is explained by the structural features and the surface conditions of oxides and gold nanoparticles, which depend on the sample synthesis conditions.

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“…Installations occurred 30 days in advance of sampling and temporally representative samples were obtained by removing 60 mL of pore water from each sampler 48 hr before sampling (Strack & Waddington, 2008). The headspace degassing technique (Ioffe and Vitenberg, 1984) was used to acquire gas from the water samples. Ambient air was drawn into the syringe in equal volume to the collected pore water (30 mL) and the sample was degassed by shaking the sample vigorously (Waddington & Day, 2007).…”

Section: Pore Water Sample Collection and Analysesmentioning

confidence: 99%

Cutover Peat Limits Methane Production Causing Low Emission at a Restored Peatland

et al. 2021

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Peatland degradation due to human activities is contributing to rising atmospheric CO2 levels. Restoring the carbon (C) sink function in degraded peatlands and preventing further stored C losses is a key climate mitigation strategy, given the global scale of peatland disturbance. Active restoration involving a combination of rewetting and vegetation reestablishment at a post‐extraction peatland in Canada has been shown to successfully re‐establish net CO2 uptake rates similar to undisturbed peatlands within a decade or two. However, lower than expected CH4 emissions suggest recovery of belowground C cycling processes may lag behind the recovery of the surface net flux. Using closed chamber measurements over a warm season, we determined that restored Sphagnum, which covers two thirds of the site, was a null source of CH4. Emissions from the restored site were primarily attributed to vascular plant substrate inputs, measured as acetate, and plant‐mediated transport. The C isotopic fractionation factor for CH4 and CO2 in the pore water from the restored former peat field suggested reduced hydrogenotrophic CH4 production deeper in the cutover peat profile (0.8 m depth). In contrast, isotopic fractionation in the former drainage ditches showed a balance of acetoclastic and hydrogenotrophic methanogenesis deeper in the profile, indicative of some bulk peat C turnover. This study suggests that the legacy of substrate quality in the cutover peat can reduce the climate warming impact of newly restored peatlands through a reduction in CH4 production and thus emission.

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Application of head-space analysis to the study of volatile organic impurity concentrates

Cited by 10 publications

References 5 publications

High Methane Emissions from a Midlatitude Reservoir Draining an Agricultural Watershed

High Methane Emissions from a Midlatitude Reservoir Draining an Agricultural Watershed

Sensors Based on Tin and Indium Oxides for the Determination of Acetone in Human Breath

Cutover Peat Limits Methane Production Causing Low Emission at a Restored Peatland

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