@article { ISI:000381081600003,
	title = {Hydrogen isotopic analysis with a chromium-packed reactor of organic compounds of relevance to ecological, archaeological, and forensic applications},
	journal = {RAPID COMMUNICATIONS IN MASS SPECTROMETRY},
	volume = {30},
	number = {{16}},
	year = {2016},
	month = {AUG 30},
	pages = {1857-1864},
	type = {Article},
	abstract = {RationaleThe H-2 values of some nitrogen-containing organic compounds measured by High-Temperature Conversion (HTC) with a glassy carbon reactor have been shown to be inaccurate. A probable explanation for these analytical inaccuracies is the formation of HCN, allowing some hydrogen atoms to escape isotope ratio measurement. We assess this isotopic effect in sample types commonly used for (paleo)ecological, environmental, archaeological, and forensic investigations. MethodsThe H-2(VSMOW-SLAP) values and mass fraction H using a factory-recommended glassy carbon HTC reactor packing were compared with those obtained from using two Cr-containing reactor packings for a variety of N-containing substances, including amino acids, collagen, hair, and silk. Results(2)H(VSMOW-SLAP) values and mass fraction H differed by reactor packing for most, but not all, N-containing samples. The H-2(VSMOW-SLAP) difference was 10-11 for modern collagen and 12-14 parts per thousand for hair, demonstrating that reactor configuration is important for these proteins, and that the use of a chromium-packed reactor may be desirable. In contrast, Bombyx mori cocoon (silk) H-2(VSMOW-SLAP) values did not differ with reactor type. In general, H-2(VSMOW-SLAP) and mass fraction H differences by reactor packing increased with mass fraction nitrogen in the sample. With the Cr-packed reactor hydrogen mass fractions were at theoretically expected values, while the glassy carbon reactor produced lower yields of hydrogen. ConclusionsThe protein and amino acid H-2(VSMOW-SLAP) values measured by factory-recommended online HTC methods differ from those from Cr-containing reactor packing. The magnitude of the differences is variable with sample type; the molecular structure and diagenetic history of each sample may be important. Careful attention to this effect is therefore recommended for the H-2 measurement for all nitrogen-containing analytes. Copyright (c) 2016 John Wiley \& Sons, Ltd.},
	issn = {0951-4198},
	doi = {10.1002/rcm.7662},
	author = {Reynard, Linda M. and Tuross, Noreen}
}
@article {2668,
	title = {Comparative Decalcification Methods, Radiocarbon Dates, and Stable Isotopes of the VIRI Bones},
	journal = {Radiocarbon},
	volume = {54},
	year = {2012},
	month = {Jan-01-2012},
	pages = {837 - 844},
	abstract = {The Fifth International Radiocarbon Comparison (VIRI) provided a suite of 5 bone samples with consensus
ages ranging from 969 to 39,305 14C yr BP (Scott et al. 2010). These bones were used herein in a comparison of decalcification
methods using either HCl or EDTA to produce collagen, and the results demonstrate age concordance between both preparation
methods and the VIRI consensus values. Additional isotopic analyses of the collagen (13C, 15N, and 18O) illustrate
the increasing sensitivity of carbon, nitrogen, and oxygen isotopes in assessing gelatin degradation.},
	issn = {0033-8222},
	doi = {10.1017/S0033822200047482},
	url = {https://www.cambridge.org/core/product/identifier/S0033822200047482/type/journal_articlehttps://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200047482},
	author = {Tuross, Noreen}
}
