Item talk:Q272420

{

 "USGS Publications Warehouse": {
   "@context": "https://schema.org",
   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "New reference materials for nitrogen-isotope-ratio measurements",
   "identifier": [
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse IndexID",
       "value": "70188275",
       "url": "https://pubs.usgs.gov/publication/70188275"
     },
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse Internal ID",
       "value": 70188275
     },
     {
       "@type": "PropertyValue",
       "propertyID": "DOI",
       "value": "10.1111/j.1751-908X.1993.tb00131.x",
       "url": "https://doi.org/10.1111/j.1751-908X.1993.tb00131.x"
     }
   ],
   "journal": {
     "@type": "Periodical",
     "name": "Geostandards Newsletter",
     "volumeNumber": "17",
     "issueNumber": "1"
   },
   "inLanguage": "en",
   "isPartOf": [
     {
       "@type": "CreativeWorkSeries",
       "name": "Geostandards Newsletter"
     }
   ],
   "datePublished": "1993",
   "dateModified": "2023-11-16",
   "abstract": "Three new reference materials were manufactured for calibration of relative stable nitrogen\u2010isotope\u2010ratio measurements:USGS25 (ammonium sulfate) \u03b4615\u2033=\u221230 per milUSGS26 (ammonium sulfate) \u03b4615\u2033=+54 per milUSGS32 (potassium nitrate) \u03b4615\u2033=+180 per milwhere \u03b4N\u2032, relative to atmospheric nitrogen, is an approximate value subject to change following interlaboratory comparisons. These materials are isotopically homogeneous in aliquots at least as small as 10 pot N, (or about 1\u20102 mg of salt). The new reference materials greatly extend the range of \u03b415N values of internationally distributed standards, and they allow normalization of \u03b415N measurements over almost the full range of known natural isotope variation on Earth. The methods used to produce these materials may be adapted to produce homogeneous local laboratory standards for routine use.",
   "description": "6 p.",
   "publisher": {
     "@type": "Organization",
     "name": "International Association of Geoanalysts"
   },
   "author": [
     {
       "@type": "Person",
       "name": "B\u00f6hlke, John K. jkbohlke@usgs.gov",
       "givenName": "John K.",
       "familyName": "B\u00f6hlke",
       "email": "jkbohlke@usgs.gov",
       "identifier": {
         "@type": "PropertyValue",
         "propertyID": "ORCID",
         "value": "0000-0001-5693-6455",
         "url": "https://orcid.org/0000-0001-5693-6455"
       },
       "affiliation": [
         {
           "@type": "Organization",
           "name": "WMA - Earth System Processes Division",
           "url": "https://www.usgs.gov/mission-areas/water-resources"
         },
         {
           "@type": "Organization",
           "name": "Hydro-Ecological Interactions Branch",
           "url": "https://www.usgs.gov/mission-areas/water-resources"
         },
         {
           "@type": "Organization",
           "name": "National Research Program - Eastern Branch",
           "url": "https://www.usgs.gov/centers/arizona-water-science-center"
         }
       ]
     },
     {
       "@type": "Person",
       "name": "Gwinn, C. J.",
       "givenName": "C. J.",
       "familyName": "Gwinn"
     },
     {
       "@type": "Person",
       "name": "Coplen, T. B.",
       "givenName": "T. B.",
       "familyName": "Coplen"
     }
   ],
   "funder": [
     {
       "@type": "Organization",
       "name": "Toxic Substances Hydrology Program",
       "url": null
     }
   ]
 }

}