@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.amerigeoss.org/dataset/3722a253-5732-45aa-a523-3197430db483> a dcat:Dataset ;
    dct:description "This Standard Reference Material (SRM) is intended for use as a primary calibration standard for the quantitative determination of thallium.  A unit of SRM 3158 consists of five 10 mL sealed borosilicate glass ampoules of an acidified aqueous solution prepared gravimetrically to contain a known mass fraction of thallium.  The solution contains nitric acid at a volume fraction of approximately 10 %. This data is public in the Certificate of Analysis for this material." ;
    dct:identifier "4765EE7CC5DEA396E0531A57068160031699" ;
    dct:issued "2025-11-20T23:43:58.288740"^^xsd:dateTime ;
    dct:language "{en}" ;
    dct:modified "2016-09-14T00:00:00"^^xsd:dateTime ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:title "SRM 3158 Thallium (Tl) Standard Solution Lot No. 993012" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "Steven J. Choquette" ;
            vcard:hasEmail <mailto:srms@nist.gov> ] ;
    dcat:keyword "advanced-materials",
        "amerigeo",
        "amerigeoss",
        "cations",
        "ckan",
        "geo",
        "geoss",
        "metals",
        "national",
        "north-america",
        "pure-materials",
        "single-element-solutions",
        "spectrometry",
        "thallium",
        "united-states" ;
    dcat:theme <%7B%22Standards:Reference%20materials%22%7D> .

<https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> a foaf:Agent ;
    foaf:name "US Migrating" .