Determination of carbon isotope ratios for honey samples by means of a liquid chromatography/isotope ratio mass spectrometry system coupled with a post-column pump

2018 ◽  
Vol 32 (15) ◽  
pp. 1271-1279 ◽  
Author(s):  
Hiroto Kawashima ◽  
Momoka Suto ◽  
Nana Suto
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Carbon Isotope ◽  
Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Isotope Ratios ◽  
Carbon Isotope Ratios ◽  
Mass Spectrometry System

Determination of n(13C)/n(12C) isotope ratios by MC-ICPMS and IRMS for providing improved R(13C/12C) value of the zero-point of the VPDB isotope delta scale

2020 ◽  
Author(s):  
Dmitriy Malinovskiy ◽  
Philip Dunn ◽  
Heidi Goenaga-Infante
Keyword(s):  
Mass Spectrometry ◽  
Carbon Isotope ◽  
Reference Materials ◽  
Inductively Coupled Plasma ◽  
Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Zero Point ◽  
Isotope Ratios ◽  
Iso 17025

<p>Carbon isotope ratios are typically expressed as isotope delta values d(<sup>13</sup>C/<sup>12</sup>C), often shortened to d<sup>13</sup>C. These are isotope ratios expressed relative to an international measurement standard, which for more than 30 years has been the virtual carbonate Vienna Peedee Belemnite (VPDB). While carbon isotope delta values relative to VPDB can be obtained with very small uncertainties, maintenance of the VPDB scale itself is challenging as it is based upon artefacts with exactly assigned isotope delta values. Linking the VPDB isotope delta scale to the SI would alleviate some of the issues inherent to artefact-based scales and aid long-term comparability of measurement results. Such a link is provided by determination of absolute isotope ratios, i.e., R(<sup>13</sup>C/<sup>12</sup>C).</p><p>New and improved methods for SI-traceable measurements of R(<sup>13</sup>C/<sup>12</sup>C) by both gas source isotope ratio mass spectrometry (IRMS) and multicollector inductively coupled plasma mass spectrometry (MC-ICPMS) have been developed at LGC. These methods are based on the calibration approach using synthetic isotopologue mixtures. The developed methodology has been successfully applied to producing glycine reference materials, ERM-AE672a and LGC171-KT, with certified SI-traceable n(<sup>13</sup>C)/n(<sup>12</sup>C) isotope amount ratios under ISO 17025 and 17034 accreditations together with indicative d(<sup>13</sup>C/<sup>12</sup>C)<sub>VPDB</sub> values traceable to VPDB.</p><p>These new reference materials realise an absolute isotope ratio for VPDB itself R(<sup>13</sup>C/<sup>12</sup>C)<sub>VPDB</sub> through regression of the  n(<sup>13</sup>C)/n(<sup>12</sup>C) against d(<sup>13</sup>C/<sup>12</sup>C)<sub>VPDB</sub> values. Examining all published values for R(<sup>13</sup>C/<sup>12</sup>C)<sub>VPDB</sub>, including our most recent results, allows a better estimation of this quantity than has previously been achievable and points the way towards linking the VPDB isotope delta scale more firmly to the SI.</p>

Carbon Isotope Ratio Analysis of Steroids by High-Temperature Liquid Chromatography-Isotope Ratio Mass Spectrometry

2014 ◽  
Vol 86 (5) ◽  
pp. 2297-2302 ◽  
Author(s):  
Lijun Zhang ◽  
Mario Thevis ◽  
Thomas Piper ◽  
Maik A. Jochmann ◽  
J. Benjamin Wolbert ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
High Temperature ◽  
Carbon Isotope ◽  
Isotope Ratio ◽  
Carbon Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Ratio Analysis ◽  
Isotope Ratio Analysis ◽  
Temperature Liquid
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