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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Haiping Qi</dc:contributor>
  <dc:creator>Tyler B. Coplen</dc:creator>
  <dc:date>2016</dc:date>
  <dc:description>&lt;p&gt;The hydrogen isotopic composition (&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;H&lt;sub&gt;VSMOW-SLAP&lt;/sub&gt;) of USGS42 and USGS43 human hair stable isotopic reference materials, normalized to the VSMOW (Vienna-Standard Mean Ocean Water)–SLAP (Standard Light Antarctic Precipitation) scale, was originally determined with a high temperature conversion technique using an elemental analyzer (TC/EA) with a glassy carbon tube and glassy carbon filling and analysis by isotope-ratio mass spectrometer (IRMS). However, the TC/EA IRMS method can produce inaccurate &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;H&lt;sub&gt;VSMOW-SLAP&lt;/sub&gt;results when analyzing nitrogen-bearing organic substances owing to the formation of hydrogen cyanide (HCN), leading to non-quantitative conversion of a sample into molecular hydrogen (H&lt;sub&gt;2&lt;/sub&gt;) for IRMS analysis. A single-oven, chromium-filled, elemental analyzer (Cr-EA) coupled to an IRMS substantially improves the measurement quality and reliability of hydrogen isotopic analysis of hydrogen- and nitrogen-bearing organic material because hot chromium scavenges all reactive elements except hydrogen. USGS42 and USGS43 human hair isotopic reference materials have been analyzed with the Cr-EA IRMS method, and the &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;H&lt;sub&gt;VSMOW-SLAP&lt;/sub&gt; values of their non-exchangeable hydrogen fractions have been revised:&lt;/p&gt;&lt;div class="formula"&gt;&lt;img src="http://www.fsijournal.org/cms/attachment/2085453690/2073866098/si1.gif" alt="Math Eq" data-mce-src="http://www.fsijournal.org/cms/attachment/2085453690/2073866098/si1.gif"&gt;&lt;/div&gt;&lt;div class="formula"&gt;&lt;img src="http://www.fsijournal.org/cms/attachment/2085453690/2073866099/si2.gif" alt="Math Eq" data-mce-src="http://www.fsijournal.org/cms/attachment/2085453690/2073866099/si2.gif"&gt;&lt;/div&gt;&lt;p&gt;&lt;span&gt;where mUr = 0.001 = ‰. On average, these revised &lt;/span&gt;&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;H&lt;/span&gt;&lt;sub&gt;VSMOW-SLAP&lt;/sub&gt;&lt;span&gt; values are 5.7 mUr more positive than those previously measured. It is critical that readers pay attention to the &lt;/span&gt;&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;H&lt;/span&gt;&lt;sub&gt;VSMOW-SLAP&lt;/sub&gt;&lt;span&gt; of isotopic reference materials in publications as they may need to adjust the &lt;/span&gt;&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;H&lt;/span&gt;&lt;sub&gt;VSMOW–SLAP&lt;/sub&gt;&lt;span&gt; measurement results of human hair in previous publications to ensure all results are on the same isotope-delta scale.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/j.forsciint.2016.05.029</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>A revision in hydrogen isotopic composition of USGS42 and USGS43 human-hair stable isotopic reference materials for forensic science</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>