Untitled

Thompson, A. E.; Anderson, R. S.; Rudolph, J.; Huang, Lin

doi:10.1023/a:1019820208377

Cited by 51 publications

(30 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Stable isotopic signatures have been used successfully to constrain the budgets of atmospheric trace gases such as methane and carbon monoxide, by applying isotope mass balance models 5–9. The recent development of highly sensitive mass spectrometric techniques using continuous‐flow isotope ratio mass spectrometry (CF‐IRMS) to analyze the stable carbon isotope ratios of atmospheric components also enabled us to apply these models to determine the amounts of trace non‐methane hydrocarbons and methyl halides in the atmosphere 10–17…”

mentioning

confidence: 99%

A selective unsaturated hydrocarbon subtraction technique for stable carbon isotopic analysis of atmospheric methyl chloride, methyl bromide, and C₂C₅ saturated hydrocarbons using continuous‐flow isotope ratio mass spectrometry

Komatsu

Tsunogai

Yamaguchi

et al. 2005

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

Using continuous-flow isotope ratio mass spectrometry, we have developed a new analytical system which enables us to determine the stable carbon isotopic composition of CH3Cl, CH3Br, and C2-C5 saturated hydrocarbons in gas samples even if they contain substantial amounts of unsaturated hydrocarbons, using an I2O5 reagent for their selective subtraction. The analytical precision of the delta13C determinations is better than 0.5 per thousand for >300 pmolC injections and better than 5 per thousand for 20 pmolC injections. Using the system, delta13C values for CH3Cl and CH3Br were found in burning exhaust that contain a substantial quantity of unsaturated hydrocarbons. CH3Cl and CH3Br measured in exhaust from burning rice plants exhibit highly 13C-depleted values of -56.6 +/- 1.3 per thousand and -48.6 +/- 3.9 per thousand, respectively, while saturated hydrocarbons exhibit delta13C values (-26.4 to -28.9 per thousand) that are comparable with the total delta13C value of the parent material (rice plant; -28.0 per thousand). Using the system, we can determine the delta13C values of methyl halides and hydrocarbons in many kinds of gas samples.

show abstract

mentioning

confidence: 99%

A selective unsaturated hydrocarbon subtraction technique for stable carbon isotopic analysis of atmospheric methyl chloride, methyl bromide, and C₂C₅ saturated hydrocarbons using continuous‐flow isotope ratio mass spectrometry

Komatsu

Tsunogai

Yamaguchi

et al. 2005

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

show abstract

“…The main sources of chloromethane in the atmosphere are to date not clearly identified (Keppler et al, 2005). The estimate of the average global isotopic atmospheric composition is δ 13 C(CH 3 Cl) = −32.6 ‰ ( Thompson et al, 2002). This value is used for the pseudo-emission of chloromethane.…”

Section: Pseudo-emission Datamentioning

confidence: 99%

“…k Assigned equal to the upper limit of the atmospheric variation. m Error of the mean from Thompson et al (2002). 1.9 ‰ (at the average global discrimination of = 17 ‰ and δ 13 C(CO 2 ) = −8 ‰) and accounts for all plant emissions with the largest UFs at magnitudes of 3 (Guenther et al, 1995). The uncertainty of the biomass burning signatures is set to 2 ‰ referring to the upper limit of errors in atmospheric δ 13 C used to validate the C 3 /C 4 burnt vegetation distribution incorporated in the GFEDv2.1 inventory (Still et al, 2003).…”

Section: Uncertaintiesmentioning

confidence: 99%

Uncertainties of fluxes and <sup>13</sup>C  ∕ <sup>12</sup>C ratios of atmospheric reactive-gas emissions

2017

View full text Add to dashboard Cite

Abstract. We provide a comprehensive review of the proxy data on the 13 C / 12 C ratios and uncertainties of emissions of reactive carbonaceous compounds into the atmosphere, with a focus on CO sources. Based on an evaluated set-up of the EMAC model, we derive the isotope-resolved data set of its emission inventory for the 1997-2005 period. Additionally, we revisit the calculus required for the correct derivation of uncertainties associated with isotope ratios of emission fluxes. The resulting δ 13 C of overall surface CO emission in 2000 of −(25.2 ± 0.7) ‰ is in line with previous bottom-up estimates and is less uncertain by a factor of 2. In contrast to this, we find that uncertainties of the respective inverse modelling estimates may be substantially larger due to the correlated nature of their derivation. We reckon the δ 13 C values of surface emissions of higher hydrocarbons to be within −24 to −27 ‰ (uncertainty typically below ±1 ‰), with an exception of isoprene and methanol emissions being close to −30 and −60 ‰, respectively. The isotope signature of ethane surface emission coincides with earlier estimates, but integrates very different source inputs. δ 13 C values are reported relative to V-PDB.

show abstract

“…For chloromethane, Thompson et al. [46] found a global δ 13 C average of -36.2‰. Budgeting of atmospheric chloromethane based on isotopic composition of known sources suggests that additional emission sources with an average δ 13 C value of -41.9±7.8‰ exist.…”

Section: Source Apportionmentmentioning

confidence: 99%

Compound-specific stable isotope analysis of organic contaminants in natural environments: a critical review of the state of the art, prospects, and future challenges

Schmidt

Zwank

Elsner

et al. 2004

Analytical and Bioanalytical Chemistry

239

View full text Add to dashboard Cite

Compound-specific stable isotope analysis (CSIA) using gas chromatography-isotope ratio mass spectrometry (GC/IRMS) has developed into a mature analytical method in many application areas over the last decade. This is in particular true for carbon isotope analysis, whereas measurements of the other elements amenable to CSIA (hydrogen, nitrogen, oxygen) are much less routine. In environmental sciences, successful applications to date include (i) the allocation of contaminant sources on a local, regional, and global scale, (ii) the identification and quantification of (bio)transformation reactions on scales ranging from batch experiments to contaminated field sites, and (iii) the characterization of elementary reaction mechanisms that govern product formation. These three application areas are discussed in detail. The investigated spectrum of compounds comprises mainly n-alkanes, monoaromatics such as benzene and toluene, methyl tert-butyl ether (MTBE), polycyclic aromatic hydrocarbons (PAHs), and chlorinated hydrocarbons such as tetrachloromethane, trichloroethylene, and polychlorinated biphenyls (PCBs). Future research directions are primarily set by the state of the art in analytical instrumentation and method development. Approaches to utilize HPLC separation in CSIA, the enhancement of sensitivity of CSIA to allow field investigations in the microg L(-1) range, and the development of methods for CSIA of other elements are reviewed. Furthermore, an alternative scheme to evaluate isotope data is outlined that would enable estimates of position-specific kinetic isotope effects and, thus, allow one to extract mechanistic chemical and biochemical information.

show abstract

Untitled

Cited by 51 publications

References 22 publications

A selective unsaturated hydrocarbon subtraction technique for stable carbon isotopic analysis of atmospheric methyl chloride, methyl bromide, and C₂C₅ saturated hydrocarbons using continuous‐flow isotope ratio mass spectrometry

A selective unsaturated hydrocarbon subtraction technique for stable carbon isotopic analysis of atmospheric methyl chloride, methyl bromide, and C₂C₅ saturated hydrocarbons using continuous‐flow isotope ratio mass spectrometry

Uncertainties of fluxes and <sup>13</sup>C  ∕ <sup>12</sup>C ratios of atmospheric reactive-gas emissions

Compound-specific stable isotope analysis of organic contaminants in natural environments: a critical review of the state of the art, prospects, and future challenges

Contact Info

Product

Resources

About

Untitled

Cited by 51 publications

References 22 publications

A selective unsaturated hydrocarbon subtraction technique for stable carbon isotopic analysis of atmospheric methyl chloride, methyl bromide, and C2C5 saturated hydrocarbons using continuous‐flow isotope ratio mass spectrometry

A selective unsaturated hydrocarbon subtraction technique for stable carbon isotopic analysis of atmospheric methyl chloride, methyl bromide, and C2C5 saturated hydrocarbons using continuous‐flow isotope ratio mass spectrometry

Uncertainties of fluxes and &lt;sup&gt;13&lt;/sup&gt;C ∕ &lt;sup&gt;12&lt;/sup&gt;C ratios of atmospheric reactive-gas emissions

Compound-specific stable isotope analysis of organic contaminants in natural environments: a critical review of the state of the art, prospects, and future challenges

Contact Info

Product

Resources

About

A selective unsaturated hydrocarbon subtraction technique for stable carbon isotopic analysis of atmospheric methyl chloride, methyl bromide, and C₂C₅ saturated hydrocarbons using continuous‐flow isotope ratio mass spectrometry

A selective unsaturated hydrocarbon subtraction technique for stable carbon isotopic analysis of atmospheric methyl chloride, methyl bromide, and C₂C₅ saturated hydrocarbons using continuous‐flow isotope ratio mass spectrometry

Uncertainties of fluxes and <sup>13</sup>C  ∕ <sup>12</sup>C ratios of atmospheric reactive-gas emissions