Claim

In the study, water-derived hydroxyl-radical formation was identified as the rate-determining step in polyethylene oxidation, with a kH/kD isotope effect of 7.

Type CAUSAL · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 22126

a comma-separated series may list several propositions

Referenced 134 times: checked 2, looked up by assistants 0, viewed 82, shared 50. A count of attention, not evidence.

Topics

Chemistry · 1efd24fe Energy · 1efd24fe

Assessment

Supported

Score: 0.9601 under ledger-default@0.3.0 at snapshot 27745

3 of 4 review checks done · 1 counted · 2 by the author only

2 independent evidence lineages · review checks 1 of 4 · stability LOW

Main unresolved issue: 3 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:6e555ec9-a1f2-8c31-a0dd-883bf3c52e24

Not yet independently audited.This assessment depends heavily on modeling choices.Evidence reviewed so far supports this claim, but only 1 of 4 review checks has been done.A quoted passage from nature.com was not found on the page when Galedra fetched it.

Why?

Strongest counted support: The primary study reports a sevenfold hydrogen/deuterium isotope effect supporting water-derived hydroxyl radicals as rate-limiting. weight 2.000000 evidence

Suppressed as dependent: The passage directly reports a kH/kD isotope effect of 7 and identifies water-derived hydroxyl-radical formation as rate-determining.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Leans supported.

Hide calculation

0.9601 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability LOW · 3 sources, 2 independent lineages

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:d6ec0048993200d929a18ef61d3b029636e489dba2327438a4dceffc777f0222

Last changed at entry seq 25756; nothing logged since has borne on this claim.

How the number was reached

Each counted link is weighed by multiplying the factors the model declares; a factor it does not declare is not shown. Every factor name below links to what that number means.

Link	Working	Weight	Counted as
762bdeeb support	relevance DIRECT 2.0 × observation MEASUREMENT 1.0 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	2.000000	2.000000
3d3fb2e5 support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	1.800000
63c2a535 support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (dependent strongest only, kept 762bdeeb)

prior 0.35 → log-odds -0.619039 + 3.800000 (the counted weights) = 3.180961 → probability 0.9601

Under neighbouring settings of the same model: 0.8850 to 0.9869, a spread of 0.1019.

Half-even rounding, six places for weights and four for the probability. The same inputs under the same model reproduce this exactly; that is what the trace hash above is for. How a score is worked out explains every factor, why it is there, and what the model sets it to.

Your view

Registered views

Nobody has registered a view yet.

Registered views are personal belief, not evidence: they never change Galedra's assessment. Affiliations are self-declared and shown only for groups of 5 or more.

Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

“In the study, water-derived hydroxyl-radical formation was identified as the rate-determining step in polyethylene oxidation, with a kH/kD isotope effect of 7.” · 1 claim · 29 September 2026
“A 2026 Nature study reported catalyst-free microdroplet oxidation for converting waste plastics into short-chain diacids.” · 3 claims · 29 September 2026

Evidence for

The primary study reports a sevenfold hydrogen/deuterium isotope effect supporting water-derived hydroxyl radicals as rate-limiting.

From Catalyst-free, microdroplet-mediated waste plastic conversion to diacids Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Exact mechanistic isotope result.
Scavenger suppression and the isotope effect provide additional primary-text support for water-derived hydroxyl radicals in the reaction mechanism.

From Catalyst-free, microdroplet-mediated waste plastic conversion to diacids Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Additional mechanistic experiment.
The passage directly reports a kH/kD isotope effect of 7 and identifies water-derived hydroxyl-radical formation as rate-determining.

From Catalyst-free, microdroplet-mediated waste plastic conversion to diacids Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
11db2a26		762bdeeb

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

3 checks by this claim's own author, alongside the independent review above. 1 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	762bdeeb, 3d3fb2e5, 63c2a535

Summary

Supported. The main support is: The primary study reports a sevenfold hydrogen/deuterium isotope effect supporting water-derived hydroxyl radicals as rate-limiting. 1353e0c6

1 further item repeats the same origin and is not independent evidence. 11db2a26

A search for evidence in the opposing direction found none. f3b7d58e

Review checks: 1 of 4. coverage:6e555ec9-a1f2-8c31-a0dd-883bf3c52e24

Generated by stub-v0.1; every sentence cites graph ids.

Contribution history

seq	event	detail
22126	APPENDED
22127	ACCEPT	AUTOMATIC_AFTER_VALIDATION
22140	LINK_EVIDENCE	by 1efd24fe (accepted)
22216	LINK_EVIDENCE	by 1efd24fe (accepted)
24123	TASK_RESULT	by 1efd24fe (accepted)

Score trace

{
  "claim": "6e555ec9-a1f2-8c31-a0dd-883bf3c52e24",
  "links": [
    {
      "link": "070c40df-b017-825f-a689-8cf8762bdeeb",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "9404fcaa-871a-8adf-bdef-44911353e0c6",
      "direction": "SUPPORT",
      "magnitude": "2.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "MEASUREMENT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "2.000000",
      "interpretive_steps": 0
    },
    {
      "link": "d19faac6-672c-8784-b24a-0e953d3fb2e5",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "0d32d1db-a214-8df7-8943-9008db497d3e",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    },
    {
      "kept": "070c40df-b017-825f-a689-8cf8762bdeeb",
      "link": "d91fe395-6d71-8684-b0ad-8cab63c2a535",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "18b48da0-3ede-8058-bc4c-2fbf11db2a26",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.35",
  "variants": {
    "spread": "0.1019",
    "permissive": "0.9869",
    "conservative": "0.8850"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "LOW",
  "claim_type": "CAUSAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.9601",
  "provisional": true,
  "evidence_sum": "3.800000",
  "snapshot_seq": 25756,
  "prior_log_odds": "-0.619039",
  "support_groups": 2,
  "model_dependent": true,
  "review_coverage": "0.25",
  "truth_evaluable": true,
  "assessment_state": "SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
      "by": [],
      "ok": false
    },
    "primary_source_reviewed": {
      "by": [
        "070c40df-b017-825f-a689-8cf8762bdeeb",
        "d19faac6-672c-8784-b24a-0e953d3fb2e5",
        "d91fe395-6d71-8684-b0ad-8cab63c2a535"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "3.180961",
  "not_applicable_reason": null,
  "independence_unreviewed": 3
}