{
  "@context": {
    "schema": "http://schema.org/",
    "prov": "http://www.w3.org/ns/prov#",
    "ex": "https://example.org/"
  },
  "@id": "ex:activity-soil-chem-analysis",
  "@type": [
    "prov:Activity"
  ],
  "schema:name": "Soil Chemistry Analysis - Great Basin Transect 2025",
  "schema:description": "Major and trace element analysis of soil samples collected along a 200 km transect across the Great Basin, using ICP-MS and XRF spectrometry with certified reference materials.",
  "prov:used": [
    {
      "@id": "http://example.org/inst/TF_RQICP-MS"
    },
    "https://vocab.nerc.ac.uk/collection/L05/current/LAB02",
    "Soil core samples collected June 2025, sites GB-001 through GB-045",
    {
      "@type": [
        "schema:CreativeWork"
      ],
      "schema:name": "EPA Method 6200 - XRF Analysis of Soils",
      "schema:url": "https://www.epa.gov/hw-sw846/sw-846-test-method-6200-field-portable-x-ray-fluorescence-spectrometry-determination"
    }
  ],
  "prov:generated": [
    {
      "@id": "ex:dataset-soil-chem-gb-2025"
    }
  ],
  "prov:wasAssociatedWith": [
    {
      "@type": [
        "schema:Person"
      ],
      "schema:name": "Dr. Maria Chen",
      "schema:identifier": {
        "@type": [
          "schema:PropertyValue"
        ],
        "schema:propertyID": "https://registry.identifiers.org/registry/orcid",
        "schema:value": "0000-0002-8765-4321",
        "schema:url": "https://orcid.org/0000-0002-8765-4321"
      },
      "schema:contactPoint": {
        "@id": "mailto:maria.chen@unr.edu"
      }
    }
  ],
  "prov:wasInformedBy": [
    {
      "@id": "ex:activity-sample-collection"
    }
  ],
  "prov:startedAtTime": "2025-07-15T08:00:00Z",
  "prov:endedAtTime": "2025-09-30T17:00:00Z",
  "prov:atLocation": {
    "@type": [
      "schema:Place"
    ],
    "schema:name": "Nevada Bureau of Mines and Geology Analytical Lab",
    "schema:address": "University of Nevada, Reno, 1664 N. Virginia Street, Reno, NV 89557",
    "schema:url": "https://www.unr.edu/nbmg"
  },
  "schema:actionStatus": "schema:CompletedActionStatus",
  "schema:actionProcess": {
    "@type": [
      "schema:HowTo"
    ],
    "schema:name": "EPA 6200 / ICP-MS Soil Geochemistry Protocol",
    "schema:description": "Combined XRF screening and ICP-MS confirmatory analysis for major and trace elements in soil matrices.",
    "schema:step": [
      {
        "@type": [
          "schema:HowToStep"
        ],
        "schema:name": "Sample preparation and acid digestion",
        "schema:description": "Homogenize dried samples, split 0.5 g aliquots, digest with HNO3-HCl-HF mixture at 190 C in closed vessels.",
        "schema:position": 1
      },
      {
        "@type": [
          "schema:HowToStep"
        ],
        "schema:name": "ICP-MS measurement and calibration",
        "schema:description": "Analyze digested solutions by ICP-MS using external calibration with NIST SRM 2710a and 2711a as quality control standards.",
        "schema:position": 2
      }
    ]
  }
}