Contribution seq 25500

Payload

{
  "ops": [
    {
      "op": "CREATE_SOURCE",
      "ref": "kvina_rae_primary",
      "title": "Quantified Carbon Dioxide Removal from an Alkalinity Addition Field Trial in the Kvina River, Norway",
      "source_type": "PRIMARY_TEXT",
      "retrieved_at": "2026-09-29T05:14:31Z",
      "canonical_uri": "https://cdrxiv.org/preprint/557"
    },
    {
      "op": "CREATE_SOURCE_LOCATION",
      "ref": "kvina_rae_scope_excerpt",
      "excerpt": "The 98-day river alkalinity enhancement trial was conducted in the Kvina River, Norway, within an existing liming programme. An additional 1,480 tonnes of calcite raised the existing pH from 6.0 to 6.8. CDR was quantified by comparing the increase in alkalinity export at the river mouth with a limed control site. The trial generated 250 ± 30 tonnes CO2-equivalent of gross CDR, or 54% of the theoretical maximum. Apart from phosphate, no other measured nutrients, trace metals, or adverse water-quality indicators increased significantly. The findings are explicitly described as site-specific to hydrology, feedstock, and lifecycle conditions.",
      "locator": {},
      "source_id": "kvina_rae_primary",
      "excerpt_hash": "sha256:7b30a8e2fcc71402438c212d224bfb3228d3a59cabc41d6ff5331c2da68f323e",
      "locator_type": "QUOTE"
    },
    {
      "op": "CREATE_EVIDENCE",
      "ref": "kvina_rae_scope_evidence",
      "statement": "The 250 ± 30 t CO2e value is a 98-day gross, control-relative estimate for additional calcite within an existing Norwegian liming programme, with phosphate as an exception among measured water-quality indicators and site-specific applicability.",
      "observation_type": "MEASUREMENT",
      "source_location_id": "kvina_rae_scope_excerpt"
    },
    {
      "op": "LINK_EVIDENCE",
      "note": "Clarifies baseline/control, additional dosing, duration, gross-versus-net translation, jurisdiction, and water-quality scope.",
      "claim_id": "44ce862b-8592-80c4-8c28-21cd11b54403",
      "direction": "QUALIFY",
      "evidence_item_id": "kvina_rae_scope_evidence",
      "interpretive_steps": 0,
      "relevance_strength": "DIRECT"
    }
  ],
  "outcome": "QUALIFIERS_FOUND",
  "searched": "Read the CDRXIV preprint and checked duration, river/site jurisdiction, existing-liming baseline, additional versus total calcite, gross versus net accounting, control comparison, pH endpoints, water-quality measurements, and site-specific translation. The 250 ± 30 t CO2e figure is gross CDR over 98 days relative to a limed control site within an existing Norwegian liming programme; it is not a general net-lifecycle estimate or an all-river baseline."
}

Rows created

• Source de7ab1b8-1821-8691-aff2-a93f4de482a6
• SourceLocation 97a85e34-ea42-86c1-a31f-e38be5548fca
• EvidenceItem 801a2e39-e284-8b2f-8be3-b5c269cef25b
• EvidenceClaimLink 8107b3b0-f4e3-8ea8-ad74-c91de5208db3 (accepted seq 25501)

Status history

Audits

None.

Audit sampling (audit-policy-v0.1): probability 1.0000, sampled yes; inputs {"n":"0.00","mean":"0.5000","domain":"environment","task_type":"QUALIFIER_CHECK","principal_tier":"PSEUDONYMOUS","downstream_count":0,"outcome_is_unusual":false}