{ "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-12T11:17:29Z", "providers": [ "Codex" ], "breadth": "recalled by Codex without web access - no source was read", "missingProviders": [], "pass": 2, "cost": { "grok": { "seconds": 19.8, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a09555-4327-7b91-8c4c-b3fec6cbf1ec\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: methyl arsonic acid\nSense to describe: (none recorded)\nDomain code: PHY.MAT\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 044: ", "usd": 0.0, "recall": true }, "codex": { "seconds": 62.0, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a09555-4323-7330-bbab-569669cea4df\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: methyl arsonic acid\nRegistry id: vr.tr.methyl-arsonic-acid\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this " } }, "enrichment": { "pass": 3, "engine": "claude", "producedAt": "2026-10-06T12:00:00Z", "ingestedAt": "2026-10-06T08:43:02+00:00", "fields": [ "agent_conduct", "ethics", "failure_modes_and_hazards", "owners", "visual_identification" ] }, "gate": { "passed": true, "version": "1.0", "at": "2026-10-07T10:10:28+00:00", "evidence": [ "completeness 1.00", "sense: Wikidata description", "2 live sources", "review by codex: pass" ] } }, "metaModel": { "id": "THING-Q1976186", "registryId": "vr.tr.methyl-arsonic-acid", "name": "methyl arsonic acid", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.MAT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q1976186/", "model": { "registry_id": "vr.tr.methyl-arsonic-acid", "name": "methyl arsonic acid", "purpose": "Enable an agent to identify methyl arsonic acid, assess the chemical state and evidential quality of a particular sample, and determine appropriate handling or analytical actions.", "definition": "Methylarsonic acid is an organoarsenic compound with formula CH3AsO(OH)2, containing pentavalent arsenic bonded directly to one methyl group and forming methylarsonate salts upon deprotonation.", "scope_statement": "This model owns vr.tr.methyl-arsonic-acid in PHY / PHY.MAT: methylarsonic acid as a substance, its sample-dependent composition and condition, and relationships to dissolved methylarsonate species, separately identified salts, and arsenic transformation products.", "in_scope": [ "Free-acid identity, verified identifiers, and synonym ambiguity", "Sample purity, grade, water content, and arsenic-containing impurities", "Physical state and measured properties under stated conditions", "Acid-base speciation and changes in arsenic oxidation state", "Species-resolved analytical evidence and concentration reporting", "Substance-specific hazards and applicable handling or regulatory constraints" ], "out_of_scope": [ "Monosodium and disodium methylarsonate as independently identified salt substances", "Complete herbicide formulations and their product authorizations", "Manufacturing processes and synthesis equipment", "Clinical diagnosis or treatment of arsenic exposure", "Whole-organism arsenic metabolism models", "Site-wide contamination transport and remediation plans" ], "distinguishing_features": [ "Verify the free-acid structure CH3AsO(OH)2 and molecular formula CH5AsO3; identity anchors are CAS 124-58-3, PubChem CID 8948, and EC 204-705-6. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/Methylarsonic-acid)", "Require one methyl group directly bonded to arsenic; distinguish the target from unmethylated inorganic arsenic and dimethylarsinic acid.", "Require the pentavalent methylated arsenic identity, conventionally MMA(V), and distinguish it from trivalent methylarsonous acid, MMA(III). [WHO arsenic assessment](https://inchem.org/documents/ehc/ehc224.htm)", "Check counterions and preparation records before treating a methylarsonate salt or its solution as a free-acid sample.", "Reject total arsenic concentration or the abbreviation MMA alone as sufficient proof of methylarsonic acid identity." ], "characteristics": [ { "name": "Chemical identity", "kind": "category", "unit_or_values": "Verified free acid; salt-related material; unresolved methylated arsenic identity", "why_it_matters": "Prevents synonym matching from collapsing chemically distinct arsenic species." }, { "name": "Arsenic oxidation state", "kind": "state", "unit_or_values": "V for target identity; measured III fraction; unresolved", "why_it_matters": "Separates the target from methylarsonous acid and identifies possible conversion." }, { "name": "Assay and purity basis", "kind": "measurement", "unit_or_values": "Mass percent, with as-received or dry basis and assay method", "why_it_matters": "Establishes how much target substance is present and whether the grade supports the intended use." }, { "name": "Arsenic impurity profile", "kind": "measurement", "unit_or_values": "mg/kg or molar fraction for individually identified arsenic species", "why_it_matters": "An acceptable bulk assay can conceal other arsenic species." }, { "name": "Water content", "kind": "measurement", "unit_or_values": "Mass percent with measurement method", "why_it_matters": "Affects weighed concentration, purity interpretation, and physical condition." }, { "name": "Physical and thermal state", "kind": "state", "unit_or_values": "Observed phase; temperature in °C; pressure in kPa; melting or decomposition evidence", "why_it_matters": "Distinguishes sample observations from condition-dependent reference properties." }, { "name": "Aqueous acid-base condition", "kind": "measurement", "unit_or_values": "pH, temperature in °C, ionic strength in mol/L, and supported species fractions", "why_it_matters": "Controls interpretation of free acid versus dissolved methylarsonate forms." }, { "name": "Target concentration", "kind": "measurement", "unit_or_values": "mol/L, mg/L as methylarsonic acid, or mg/L as As; basis required", "why_it_matters": "Prevents direct comparison of compound-mass and arsenic-mass results." }, { "name": "Sample transformation history", "kind": "relation", "unit_or_values": "Links to collection, preservation, storage, extraction, and analysis records", "why_it_matters": "Helps determine whether measured speciation represents the original sample." }, { "name": "Hazard and regulatory applicability", "kind": "relation", "unit_or_values": "Dated classification, jurisdiction, exact substance or mixture, exposure route, and concentration basis", "why_it_matters": "Supports decisions without transferring classifications or permissions from neighboring arsenic substances." } ], "affordances": [ "Resolve a supplied chemical name or identifier against the free-acid structure and flag salt or oxidation-state ambiguity.", "Assess whether a batch is suitable for a specified analytical or research use from its assay and impurity evidence.", "Compare concentrations after explicitly reconciling compound-mass, arsenic-mass, and molar reporting bases.", "Select a validated speciation analysis capable of distinguishing the target from relevant arsenic interferents.", "Evaluate whether sample preservation and storage support the reported chemical state.", "Determine handling, containment, and waste-routing requirements from verified applicable records." ], "agent_conduct": { "may": [ "Identify methylarsonic acid and its salts in records, products or monitoring reports.", "Explain its arsenic content and the rules that apply, citing official sources." ], "must_not": [ "Provide guidance on obtaining or using it to poison people or animals.", "Recommend its use as a herbicide where approval has been withdrawn.", "Advise disposal that releases arsenic to soil or water.", "Treat organic arsenic compounds as harmless without evidence." ], "requires_human": [ "Disposal of old stocks or remediation of contaminated land.", "Responding to a suspected poisoning, which needs emergency medical services." ] }, "ethics": { "considerations": [ "Arsenic compounds persist in soil and can reach food and water.", "Past use on fields, golf courses and roadsides has left contamination that affects communities." ], "affected_parties": [ "Communities near treated land", "Workers", "Wildlife" ] }, "owners": { "steward": "The holder of any stock; environmental and pesticide authorities regulate it.", "master_systems": [ "Pesticide authorization registers", "Contaminated land registers" ] }, "visual_identification": [ "A white crystalline solid; salts appear in formulated herbicide products, so labels settle identity.", "Old containers may carry withdrawn herbicide names." ], "failure_modes_and_hazards": [ "Can convert in the environment to more toxic inorganic arsenic.", "Toxic if swallowed and harmful to aquatic life.", "Contaminates soil for long periods." ], "what_it_is_for": [ "Methylarsonic acid is encountered in analytical chemistry and research on arsenic metabolism and environmental transformation.", "It is relevant to investigations of arsenic compounds in water, soil and biological samples, where the acid and its salts require careful distinction." ], "standards_and_regulation": [ "The Globally Harmonized System of Classification and Labelling of Chemicals, published by the United Nations, provides the framework for communicating chemical hazards through labels and safety data sheets.", "The REACH Regulation, issued by the European Parliament and the Council of the European Union, governs applicable manufacture, import and supply obligations for this substance in the European Union." ] }, "sources": [ { "id": "wikidata", "title": "Wikidata item Q1976186: methyl arsonic acid", "url": "https://www.wikidata.org/wiki/Q1976186", "url_status": "live", "what_it_supports": "identity and sense of the item", "checked_by": "wikidata-api" }, { "id": "wikipedia-en", "title": "Wikipedia: Methylarsonic acid", "url": "https://en.wikipedia.org/wiki/Methylarsonic_acid", "url_status": "live", "what_it_supports": "general description of the item", "checked_by": "wikidata-api sitelink" } ], "structure": { "bundles": [ { "id": "methylated-arsenic-identity", "name": "Methylated arsenic identity", "description": "Establishes which chemical entity the registry name denotes and which related entities require separate identities.", "rationale": "Names and abbreviations can obscure differences in methylation, oxidation state, and salt form.", "layers": [ { "id": "free-acid-identity", "name": "Free-acid identity", "description": "Connects the registered thing to structural and identifier evidence.", "findings": [ { "id": "structure-controls-name-resolution", "name": "Structure controls name resolution", "description": "The model should accept name equivalence only when identifiers resolve to the same free-acid structure.", "questions": [ { "text": "Does the supplied name resolve to CH3AsO(OH)2 and CAS 124-58-3?", "kind": "definition", "id": "structure-controls-name-resolution-q01" }, { "text": "Which authoritative record supports each identifier or synonym assignment?", "kind": "provenance", "id": "structure-controls-name-resolution-q02" } ] } ] }, { "id": "neighboring-arsenic-entities", "name": "Neighboring arsenic entities", "description": "Separates salts, protonation states, and chemically transformed arsenic species.", "findings": [ { "id": "salt-and-species-boundaries", "name": "Salt and species boundaries", "description": "Dissolved speciation belongs to sample state; an independently supplied salt or different oxidation-state compound needs an explicit related-entity link.", "questions": [ { "text": "Was the material supplied as free acid, a named methylarsonate salt, or an unresolved mixture?", "kind": "boundary", "id": "salt-and-species-boundaries-q01" }, { "text": "What evidence distinguishes MMA(V) from MMA(III), dimethylated arsenic, and inorganic arsenic?", "kind": "measurement", "id": "salt-and-species-boundaries-q02" } ] } ] } ] }, { "id": "composition-and-physicochemical-state", "name": "Composition and physicochemical state", "description": "Describes the actual material and the conditions under which its properties are meaningful.", "rationale": "The chemical name alone cannot establish sample purity, dissolved speciation, or suitability for quantitative use.", "layers": [ { "id": "batch-composition", "name": "Batch composition", "description": "Records target assay, moisture, counterions, and relevant impurities.", "findings": [ { "id": "purity-needs-species-evidence", "name": "Purity needs species evidence", "description": "Target assay should be distinguished from total arsenic content and accompanied by evidence about other arsenic species.", "questions": [ { "text": "What is the methylarsonic acid assay, its uncertainty, and its dry or as-received basis?", "kind": "measurement", "id": "purity-needs-species-evidence-q01" }, { "text": "Which arsenic impurities, counterions, and water content were measured rather than assumed absent?", "kind": "measurement", "id": "purity-needs-species-evidence-q02" } ] } ] }, { "id": "phase-and-solution-equilibria", "name": "Phase and solution equilibria", "description": "Connects physical-property observations and acid-base interpretations to experimental conditions.", "findings": [ { "id": "condition-qualified-properties", "name": "Condition-qualified properties", "description": "Solubility, thermal transitions, and aqueous protonation assignments require their own conditions and evidence.", "questions": [ { "text": "Which phase, solubility, melting, boiling, or decomposition observations are supported, at what temperature and pressure?", "kind": "measurement", "id": "condition-qualified-properties-q01" }, { "text": "Which measured pH and supported dissociation constants justify the proposed aqueous species distribution?", "kind": "measurement", "id": "condition-qualified-properties-q02" } ] } ] } ] }, { "id": "speciation-evidence-and-transformation", "name": "Speciation evidence and transformation", "description": "Determines whether an analytical result identifies the target and preserves the meaning of the original sample.", "rationale": "An arsenic measurement can be quantitatively accurate while failing to identify methylarsonic acid or its original state.", "layers": [ { "id": "analytical-specificity", "name": "Analytical specificity", "description": "Assesses separation, identification, calibration, and reporting basis.", "findings": [ { "id": "target-specific-quantification", "name": "Target-specific quantification", "description": "Quantification requires evidence that the reported signal belongs to the intended methylated arsenic species.", "questions": [ { "text": "How does the validated method distinguish the target from coeluting arsenic species in this matrix?", "kind": "measurement", "id": "target-specific-quantification-q01" }, { "text": "Which reference standard, recovery evidence, quantification limit, and concentration basis support the result?", "kind": "provenance", "id": "target-specific-quantification-q02" } ] } ] }, { "id": "sample-history-and-conversion", "name": "Sample history and conversion", "description": "Tracks changes that could separate measured speciation from the original material.", "findings": [ { "id": "preservation-requires-validation", "name": "Preservation requires validation", "description": "Possible oxidation-state or methylation changes should be evaluated from matrix-specific evidence rather than presumed absent.", "questions": [ { "text": "What preservation, storage, and extraction history could have altered the measured arsenic species?", "kind": "provenance", "id": "preservation-requires-validation-q01" }, { "text": "What stability evidence or repeat analysis is needed before treating this result as representative of the original sample?", "kind": "action", "id": "preservation-requires-validation-q02" } ] } ] } ] }, { "id": "hazards-and-permitted-actions", "name": "Hazards and permitted actions", "description": "Relates the identified material and its condition to evidence-based handling and jurisdiction-specific constraints.", "rationale": "Arsenic-related hazard evidence and product permissions must be checked for applicability to this exact substance and use.", "layers": [ { "id": "hazard-evidence-and-exposure", "name": "Hazard evidence and exposure", "description": "Connects classification and exposure criteria to chemical identity, sample form, and route.", "findings": [ { "id": "classification-applicability", "name": "Classification applicability", "description": "The model should distinguish evidence for the free acid from evidence for other arsenicals or formulated mixtures.", "questions": [ { "text": "Which current GHS classification and safety data record explicitly cover this identity and sample composition?", "kind": "provenance", "id": "classification-applicability-q01" }, { "text": "Does an applicable exposure limit cover this arsenic species, and what route, averaging period, units, and arsenic basis does it use?", "kind": "boundary", "id": "classification-applicability-q02" } ] } ] }, { "id": "use-and-waste-decisions", "name": "Use and waste decisions", "description": "Supports concrete handling, use, and disposal decisions without importing permissions from related products.", "findings": [ { "id": "action-specific-authority", "name": "Action-specific authority", "description": "A proposed action requires records applicable to the material, intended use, and jurisdiction.", "questions": [ { "text": "Which verified requirements govern containment, storage compatibility, and waste routing for this sample?", "kind": "action", "id": "action-specific-authority-q01" }, { "text": "Does any claimed use authorization apply to the free acid itself, a methylarsonate salt, or a specific formulated product?", "kind": "boundary", "id": "action-specific-authority-q02" } ] } ] } ] }, { "id": "evidence-and-external-alignment", "name": "Evidence and external alignment", "description": "What the world already says about this thing, gathered so the model can be checked against it.", "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.", "layers": [ { "id": "reported-evidence", "name": "Reported evidence", "description": "Findings from the breadth pass, kept separate from the structural claims.", "findings": [ { "id": "evidence-confidence-notes", "name": "Check these first", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "This is recalled information, not source-verified research.", "Confirm that the registry intends the free acid rather than a salt or herbicide formulation.", "Physical constants, exposure limits, hazard classifications and current pesticide authorizations require verification for the exact substance and jurisdiction." ], "questions": [ { "id": "evidence-confidence-notes-q01", "text": "Which of these check these first hold for the sense of methyl arsonic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-identifiers", "name": "Identifiers and schemes", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ { "scheme": "CAS Registry Number", "value_or_pattern": "124-58-3", "note": "Identifies the free acid; its salts have separate identities." }, { "scheme": "Molecular formula", "value_or_pattern": "CH5AsO3", "note": "Condensed structural formula: CH3AsO(OH)2." }, { "scheme": "Common chemical nomenclature", "value_or_pattern": "methylarsonic acid; monomethylarsonic acid", "note": "Often abbreviated MMA(V), which explicitly distinguishes the pentavalent compound." } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of methyl arsonic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-real-world-use", "name": "Real-world use", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "Its sodium salts have been used as organoarsenical herbicides.", "Analyzed in environmental and biological samples to study arsenic speciation and metabolism.", "Used as a reference compound in analytical studies of methylated arsenic species." ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of methyl arsonic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-measurements", "name": "Typical measurements", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ { "quantity": "Molar mass of the free acid", "typical_range": "139.97", "unit": "g/mol" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of methyl arsonic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-failure-modes-and-hazards", "name": "Failure modes and hazards", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "Arsenic-containing substance presenting toxicity concerns upon exposure.", "Chemical or biological transformation can change arsenic speciation and toxicity.", "Confusing pentavalent methylarsonic acid with trivalent methylarsinous acid can substantially distort toxicological interpretation.", "Disposal or environmental transformation does not eliminate the arsenic content." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of methyl arsonic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-neighbours", "name": "Neighbouring kinds and how to tell them apart", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ { "name": "Methylarsinous acid", "difference": "Contains trivalent arsenic, whereas methylarsonic acid contains pentavalent arsenic." }, { "name": "Dimethylarsinic acid", "difference": "Has two methyl groups bonded to arsenic rather than one." }, { "name": "Arsonic acid", "difference": "Has a hydrogen bonded to arsenic where methylarsonic acid has a methyl group." }, { "name": "Monosodium methylarsonate", "difference": "Is a sodium salt formed by replacing one acidic proton of methylarsonic acid." }, { "name": "Disodium methylarsonate", "difference": "Is a sodium salt formed by replacing both acidic protons of methylarsonic acid." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of methyl arsonic acid this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Which primary measurements establish dissociation constants and solubility across relevant temperature and ionic-strength conditions?", "What reliable thermal data distinguish melting from decomposition, and is a meaningful boiling point available?", "Which current jurisdiction-specific GHS classifications and exposure limits explicitly apply to methylarsonic acid rather than broader arsenic categories?", "Which preservation and analytical methods demonstrate adequate MMA(V)/MMA(III) discrimination and stability in the intended sample matrices?", "What impurity limits and reference-material certification are necessary for each intended grade or analytical use?" ], "statistics": { "bundles": 5, "layers": 9, "findings": 14, "questions": 22 } }