scholarly journals Certification of natural isotopic abundance inorganic mercury reference material NIMS-1 for absolute isotopic composition and atomic weight

2010 ◽  
Vol 25 (3) ◽  
pp. 384 ◽  
Author(s):  
Juris Meija ◽  
Lu Yang ◽  
Ralph E. Sturgeon ◽  
Zoltán Mester
Keyword(s):  
Reference Material ◽  
Isotopic Composition ◽  
Inorganic Mercury ◽  
Atomic Weight ◽  
Isotopic Abundance ◽  
Natural Isotopic Abundance

The Isotopic Composition of Atmospheric Neon

1966 ◽  
Vol 21 (1-2) ◽  
pp. 115-119 ◽  
Author(s):  
J. R. Walton ◽  
A. E. Cameron
Keyword(s):  
Mass Spectrometry ◽  
Isotopic Composition ◽  
Atomic Weight ◽  
Isotopic Abundance ◽  
Calibration Standards ◽  
Physical And Chemical ◽  
Percentage Abundance

“Absolute” values for the isotopic abundance ratios of atmospheric neon have been determined by mass spectrometry. Calibration standards were prepared by mixing of nearly pure separated nuclides of neon. The percentage abundance of the three nuclides of neon are:20Ne = 90.514 ± 0.031, 21Ne = 0.266 ± 0.005, 22Ne =9.220 ± 0.029.The calculated atomic weight of neon on the unified physical and chemical atomic weight scale (12C=12) is 20.1794 ± 0.0030.

Herkunftsbestimmung von Arzneimitteln durch Messung von natürlichen Isotopenverhältnissen: D/H und 13C/12C Verhältnisse einiger Proben von Diazepam / Determination of the Origin of Drugs by Measuring Natural Isotope Contents: D/H and 13C/12C Ratios of Some Diazepam Samples

1976 ◽  
Vol 31 (3-4) ◽  
pp. 111-114 ◽  
Author(s):  
Peter Bommer ◽  
Heribert Moser ◽  
Willibald Stichler ◽  
Peter Trimborn ◽  
Walter Vetter
Keyword(s):  
Isotopic Composition ◽  
Precise Determination ◽  
Commercial Product ◽  
Isotopic Ratios ◽  
Isotopic Abundance ◽  
Natural Isotopic Abundance ◽  
Natural Isotope

Abstract The precise determination of the natural isotopic abundance ratios of carbon and hydrogen in several production batches of the commercial product 7-chlor-1,3-dihydro-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-on (diazepam) gave results which allowed certain batches to be differentiated. The differences in the ratios appear to be mainly due to differences in the isotopic composition of the (fossile) starting materials of the synthesis. The measurement of the natural isotopic ratios may therefore offer another possibility to deter­ mine the origin of a drug.

Atomic weights of the elements 1999 (IUPAC Technical Report)

2001 ◽  
Vol 73 (4) ◽  
pp. 667-683 ◽  
Author(s):  
Tyler B. Coplen
Keyword(s):  
Isotopic Composition ◽  
Scientific Community ◽  
Atomic Weight ◽  
Atomic Mass ◽  
Isotopic Abundance ◽  
Technical Report ◽  
Relative Atomic Mass ◽  
Isotopic Abundances

The biennial review of atomic-weight, Ar(E), determinations and other cognate data have resulted in changes for the standard atomic weights of the following elements: elementFromTonitrogen14.006 74 ± 0.000 0714.0067 ± 0.0002 sulfur32.066 ± 0.00632.065 ± 0.005 chlorine35.4527 ± 0.000935.453 ± 0.002germanium72.61 ± 0.0272.64 ± 0.01 xenon131.29 ± 0.02131.293 ± 0.006 erbium167.26 ± 0.03167.259 ± 0.003 uranium238.0289 ± 0.0001238.028 91 ± 0.000 03 Presented are updated tables of the standard atomic weights and their uncertainties estimated by combining experimental uncertainties and terrestrial variabilities. In addition, this report again contains an updated table of relative atomic-mass values and half-lives of selected radioisotopes. Changes in the evaluated isotopic abundance values from those published in 1997 are so minor that an updated list will not be published for the year 1999.Many elements have a different isotopic composition in some nonterrestrial materials. Some recent data on parent nuclides that might affect isotopic abundances or atomic-weight values are included in this report for the information of the interested scientific community.

Measurement of the isotopic composition and atomic weight of an isotopic reference material of platinum, IRMM-010

2002 ◽  
Vol 460 (1) ◽  
pp. 41-47 ◽  
Author(s):  
C.S.J. Wolff Briche ◽  
A. Held ◽  
M. Berglund ◽  
P. De Bièvre ◽  
P.D.P. Taylor
Keyword(s):  
Reference Material ◽  
Isotopic Composition ◽  
Atomic Weight

Sequential assignment of NMR spectra of peptides at natural isotopic abundance with Zero and Ultra-Low Field-TOCSY

2021 ◽  
Author(s):  
Alexey S. Kiryutin ◽  
Ivan V. Zhukov ◽  
Fabien Ferrage ◽  
G Bodenhausen ◽  
Alexandra V. Yurkovskaya ◽  
...  
Keyword(s):  
High Field ◽  
Nmr Spectra ◽  
Correlation Spectroscopy ◽  
Sequential Assignment ◽  
Isotopic Abundance ◽  
Natural Isotopic Abundance ◽  
Low Field ◽  
Total Correlation ◽  
High Resolution Nmr ◽  
Novel Method

A novel method dubbed ZULF-TOCSY results from the combination of Zero and Ultra-Low Field (ZULF) with high-field, high-resolution NMR, leading to a generalization of the concept of total correlation spectroscopy...

3D H2BC: A novel experiment for small-molecule and biomolecular NMR at natural isotopic abundance

2009 ◽  
Vol 200 (2) ◽  
pp. 340-343 ◽  
Author(s):  
Sebastian Meier ◽  
Andrew J. Benie ◽  
Jens Ø. Duus ◽  
Ole W. Sørensen
Keyword(s):  
Small Molecule ◽  
Isotopic Abundance ◽  
Biomolecular Nmr ◽  
Natural Isotopic Abundance

scholarly journals Determination of methyl mercury and total mercury in sediment samples collected from canals in HoChiMinh city

2016 ◽  
Vol 19 (4) ◽  
pp. 123-136
Author(s):  
Hien Thai Hoang ◽  
Dong Van Nguyen
Keyword(s):  
Reference Material ◽  
Analytical Method ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Inorganic Mercury ◽  
Absorption Spectrometry ◽  
Internal Reference ◽  
Atomic Fluorescence ◽  
Sediment Samples ◽  
Cold Vapour

In this study, the analysis of methyl mercury (MeHg) and total mercury (T-Hg) was studied using gas chromatographic separation/atomic fluorescence spectrometric detection and cold vapour atomic absorption spectrometry respectively. MeHg was extracted from sediment matrix using HNO3/KCl/CuSO4 into dichloromethane followed ethylation with NaB(C2H5)4 in hexane. Total mercury was digested using three different procedures: EPA 245.1, AOAC 971.21 and our proposed one. The reliability of the analytical method for MeHg was evaluated by the use of the certified reference material ERM CC-580. In addition, the analytical method for total merury was evaluated using a fresh water sediment as an internal reference material, spiked with inorganic mercury, methyl mercury and phenyl mercury. The method detection limits for MeHg and total mercury were 0.08 and 0.15 ng/g (as Hg), respectively. The established analytical methods were applied to analyse MeHg and total mercury in sediment samples collected from canals and rivers in Hochiminh City. The concentrations of methyl mercury and total mercury in sediment samples were 0.08–2.87 ng/g và 14 – 623 ng/g (as Hg, dw). [MeHg]/Σ[Hg] respectirely were in a range of 0.1–2.3 %, which was in good agreement with the published ratios in sediment samples. A good correlation between the concentration of MeHg with total mercury and total organic carbon contents in the studied sediment samples was found.

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