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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>William I. Ridley</dc:contributor>
  <dc:contributor>Poul Emsbo</dc:contributor>
  <dc:creator>Michael J. Pribil</dc:creator>
  <dc:date>2015</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Isotope ratio measurements using a multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) commonly use standard-sample bracketing with a single isotope standard for mass bias correction for elements with narrow-range isotope systems measured by MC-ICP-MS, e.g. Cu, Fe, Zn, and Hg. However, sulfur (S) isotopic composition (δ&lt;/span&gt;&lt;sup&gt;34&lt;/sup&gt;&lt;span&gt;S) in nature can range from at least −&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;40 to +&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;40‰, potentially exceeding the ability of standard-sample bracketing using a single sulfur isotope standard to accurately correct for mass bias. Isotopic fractionation via solution and laser ablation introduction was determined during sulfate sulfur (S&lt;/span&gt;&lt;sub&gt;sulfate&lt;/sub&gt;&lt;span&gt;) isotope measurements. An external isotope calibration curve was constructed using in-house and National Institute of Standards and Technology (NIST) S&lt;/span&gt;&lt;sub&gt;sulfate&lt;/sub&gt;&lt;span&gt; isotope reference materials (RM) in an attempt to correct for the difference. The ability of external isotope correction for S&lt;/span&gt;&lt;sub&gt;sulfate&lt;/sub&gt;&lt;span&gt; isotope measurements was evaluated by analyzing NIST and United States Geological Survey (USGS) S&lt;/span&gt;&lt;sub&gt;sulfate&lt;/sub&gt;&lt;span&gt; isotope reference materials as unknowns. Differences in δ&lt;/span&gt;&lt;sup&gt;34&lt;/sup&gt;&lt;span&gt;S&lt;/span&gt;&lt;sub&gt;sulfate&lt;/sub&gt;&lt;span&gt; between standard-sample bracketing and standard-sample bracketing with external isotope correction for sulfate samples ranged from 0.72‰ to 2.35‰ over a δ&lt;/span&gt;&lt;sup&gt;34&lt;/sup&gt;&lt;span&gt;S range of 1.40‰ to 21.17‰. No isotopic differences were observed when analyzing S&lt;/span&gt;&lt;sub&gt;sulfide&lt;/sub&gt;&lt;span&gt; reference materials over a δ&lt;/span&gt;&lt;sup&gt;34&lt;/sup&gt;&lt;span&gt;S&lt;/span&gt;&lt;sub&gt;sulfide&lt;/sub&gt;&lt;span&gt; range of −&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;32.1‰ to 17.3‰ and a δ&lt;/span&gt;&lt;sup&gt;33&lt;/sup&gt;&lt;span&gt;S range of −&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;16.5‰ to 8.9‰ via laser ablation (LA)-MC-ICP-MS. Here, we identify a possible plasma induced fractionation for S&lt;/span&gt;&lt;sub&gt;sulfate&lt;/sub&gt;&lt;span&gt; and describe a new method using external isotope calibration corrections using solution and LA-MC-ICP-MS.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/j.chemgeo.2015.07.014</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Sulfate and sulfide sulfur isotopes (δ34S and δ33S) measured by solution and laser ablation MC-ICP-MS: An enhanced approach using external correction</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>