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Attention Score in Context
| Title |
Organic Reference Materials for Hydrogen, Carbon, and Nitrogen Stable Isotope-Ratio Measurements: Caffeines, n‑Alkanes, Fatty Acid Methyl Esters, Glycines, l‑Valines, Polyethylenes, and Oils
|
|---|---|
| Published in |
Analytical Chemistry, March 2016
|
| DOI | 10.1021/acs.analchem.5b04392 |
| Pubmed ID | |
| Authors |
Arndt Schimmelmann, Haiping Qi, Tyler B. Coplen, Willi A. Brand, Jon Fong, Wolfram Meier-Augenstein, Helen F. Kemp, Blaza Toman, Annika Ackermann, Sergey Assonov, Anita T. Aerts-Bijma, Ramona Brejcha, Yoshito Chikaraishi, Tamim Darwish, Martin Elsner, Matthias Gehre, Heike Geilmann, Manfred Gröning, Jean-François Hélie, Sara Herrero-Martín, Harro A. J. Meijer, Peter E. Sauer, Alex L. Sessions, Roland A. Werner |
| Abstract |
An international project developed, quality-tested, and determined isotope-δ values of 19 new organic reference materials (RMs) for hydrogen, carbon, and nitrogen stable isotope-ratio measurements, in addition to analyzing pre-existing RMs NBS 22 (oil), IAEA-CH-7 (polyethylene foil), and IAEA-600 (caffeine). These new RMs enable users to normalize measurements of samples to isotope-δ scales. The RMs span a range of δ2HVSMOW-SLAP values from -210.8 to +397.0 mUr or ‰, for δ13CVPDB-LSVEC from -40.81 to +0.49 mUr, and for δ15NAir from -5.21 to +61.53 mUr. Many of the new RMs are amenable to gas and liquid chromatography. The RMs include triads of isotopically contrasting caffeines, C16 n-alkanes, n-C20-fatty acid methyl esters (FAMEs), glycines, and L-valines, together with polyethylene powder and string, one n-C17-FAME, a vacuum oil (NBS 22a) to replace NBS 22 oil, and a 2H-enriched vacuum oil. Eleven laboratories from 7 countries used multiple analytical approaches and instrumentation for 2-point isotopic normalization against international primary measurement standards. The use of reference waters in silver tubes allowed direct normalization of δ2H values of organic materials against isotopic reference waters following the principle of identical treatment. Bayesian statistical analysis yielded the mean values reported here. New RMs are numbered from USGS61 through USGS78, in addition to NBS 22a. Due to exchangeable hydrogen, amino acid RMs currently are recommended only for carbon- and nitrogen-isotope measurements. Some amino acids contain 13C and carbon-bound organic 2H-enrichments at different molecular sites to provide RMs for potential site-specific isotopic analysis in future studies. |
X Demographics
The data shown below were collected from the profiles of 5 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 1 | 20% |
| Chile | 1 | 20% |
| Unknown | 3 | 60% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 4 | 80% |
| Scientists | 1 | 20% |
Mendeley readers
The data shown below were compiled from readership statistics for 130 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Canada | 3 | 2% |
| United Kingdom | 1 | <1% |
| Germany | 1 | <1% |
| France | 1 | <1% |
| Unknown | 124 | 95% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 30 | 23% |
| Researcher | 24 | 18% |
| Student > Master | 9 | 7% |
| Student > Doctoral Student | 8 | 6% |
| Other | 7 | 5% |
| Other | 20 | 15% |
| Unknown | 32 | 25% |
| Readers by discipline | Count | As % |
|---|---|---|
| Earth and Planetary Sciences | 22 | 17% |
| Environmental Science | 21 | 16% |
| Chemistry | 16 | 12% |
| Medicine and Dentistry | 8 | 6% |
| Agricultural and Biological Sciences | 7 | 5% |
| Other | 15 | 12% |
| Unknown | 41 | 32% |
Attention Score in Context
This research output has an Altmetric Attention Score of 23. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 09 August 2018.
All research outputs
#1,426,385
of 22,858,915 outputs
Outputs from Analytical Chemistry
#422
of 26,501 outputs
Outputs of similar age
#26,055
of 301,001 outputs
Outputs of similar age from Analytical Chemistry
#11
of 226 outputs
Altmetric has tracked 22,858,915 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 93rd percentile: it's in the top 10% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 26,501 research outputs from this source. They receive a mean Attention Score of 4.7. This one has done particularly well, scoring higher than 98% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 301,001 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 91% of its contemporaries.
We're also able to compare this research output to 226 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 95% of its contemporaries.