{"hq_id":"hq-p-spe-000134","name":"Grain Storage Fumigation (Phosphine Gas, Aluminum Phosphide, Farmworker Deaths)","category":{"primary":"specialized","secondary":"agriculture","tags":["grain storage","fumigation","phosphine","aluminum phosphide","farmworker","death","residue","import"]},"product_tier":"SPE","overall_risk_level":"high","description":"Phosphine gas (PH3) is the primary fumigant for stored grain worldwide — generated from aluminum phosphide or magnesium phosphide tablets placed in grain bins. Extremely toxic: LC50 ~10 ppm (4-hour inhalation). Farmworker deaths: 25+ phosphine-related fatalities in US grain storage (EPA). Exposure route: entering fumigated grain bin during or after treatment without adequate ventilation. Phosphine residue on grain: US FDA tolerance 0.01 ppm (extremely low — phosphine dissipates). Import monitoring: FDA tests imported spices, grains for phosphine residue. Alternatives: controlled atmosphere storage (CO2 or N2), hermetic storage (GrainPro bags), cold storage — but phosphine remains cheapest and most widely used globally.","synthesis":{"derived_risk_level":"insufficient_data","synthesis_confidence":0,"synthesis_method":"none","context_source":null,"compounds_resolved":1,"compounds_total":1,"synthesis_date":"2026-05-09","synthesis_version":"1.2.0","methodology_note":"exposure_modifier and adjusted_magnitude are computed from ALETHEIA-calibrated heuristics (route × duration × frequency multipliers, clamped to [0.5, 1.4]). Multipliers are directionally informed by EPA Exposure Factors Handbook (2011) and CalEPA OEHHA but are not regulatory consensus. See /api/methodology for full disclosure."},"hazard_summary":{"sensitive_populations":"grain storage workers (lethal confined space exposure), residents near grain storage, families in homes where AlP misused","overall_risk":"high","primary_concerns":["25+ US farmworker deaths from phosphine in grain storage","LC50 ~10 ppm (4-hour) — lethal at very low concentrations","Aluminum phosphide misuse as rodenticide in homes (family death incidents)","OSHA PEL 0.3 ppm — extremely low safe exposure level"],"exposure_routes":"Inhalation (phosphine gas — primary route, lethal in confined spaces)"},"exposure":{"routes":["inhalation"],"contact_types":["inhalation"],"users":["adult"],"duration":"minutes_to_hours","frequency":"seasonal","scenarios":["Farmworker entering fumigated grain bin (lethal PH3 concentration)","Residential proximity to grain storage during fumigation","Phosphine tablets misused as rodenticide in homes (deaths documented)","Import: grain arriving with active phosphine residue"],"notes":"Phosphine: odor of garlic/decaying fish at >2 ppm. OSHA PEL: 0.3 ppm TWA, 1 ppm STEL. IDLH: 50 ppm. LC50: ~10 ppm (4-hr). Aluminum phosphide tablets (Phostoxin, Weevil-Cide): react with moisture to generate PH3 gas. Grain bin entry: confined space regulations (29 CFR 1910.146) apply — test atmosphere, ventilate, attendant required. Residential misuse: aluminum phosphide rodenticide tablets used indoors — multiple family death incidents (Amarillo TX 2017: 4 deaths, Laredo TX 2015, etc.). FDA tolerance: 0.01 ppm in/on stored grain — effectively non-detectable after proper aeration."},"consumer_guidance":{"usage_warning":"Consumer grain exposure: negligible after proper aeration (FDA 0.01 ppm tolerance). Farmworkers: NEVER enter grain bin during or after fumigation without atmosphere testing and ventilation. Confined space entry: 29 CFR 1910.146 — test, ventilate, attendant. NEVER use aluminum phosphide tablets indoors or as home rodenticide — use only in approved grain storage applications per label.","safer_alternatives":["Controlled atmosphere storage (CO2 or N2 displacement)","Hermetic storage (GrainPro bags — oxygen depletion kills insects)","Cold storage (insects cannot survive below 13C/55F)","Heat treatment (60C/140F for 10 min kills stored product insects)"]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"EPA FIFRA (Phosphine/AlP) + OSHA Confined Space + FDA Tolerance","citation":"FIFRA; 29 CFR 1910.146; 40 CFR 180.225","requirements":"Phosphine: OSHA PEL 0.3 ppm TWA, 1 ppm STEL. Confined space: test atmosphere, ventilate, attendant. FDA: 0.01 ppm tolerance on grain. Restricted Use Pesticide: certified applicators only.","compliance_status":null,"effective_date":null,"enforcing_agency":"EPA / OSHA / FDA","penalties":"FIFRA: up to $25,000/day; OSHA: serious violation penalties","source_ref":null}],"certifications":[],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":false,"disposal_guidance":"Spent aluminum phosphide tablets: deactivate fully (expose to air until no longer reactive), then regular waste. Containers: FIFRA disposal per label.","hazardous_waste":true,"expected_lifespan":"single_use"},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-ino-000163","compound_name":null,"role":"fumigant","typical_concentration":null}],"identifiers":{"common_names":["grain storage fumigation (phosphine gas, aluminum phosphide, farmworker deaths)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"McCormick","manufacturer":"McCormick & Co","market_position":"mass_market","notable":"Market-leading spice brand"},{"brand":"Simply Organic","manufacturer":"Frontier Co-op","market_position":"premium","notable":"Organic spice brand"},{"brand":"Trader Joe's","manufacturer":"Aldi","market_position":"mass_market","notable":"Private-label spice products"}],"brand_examples_disclaimer":"Representative branded products of this category. Concerning ingredients listed in materials.concerning[] apply to the category, not necessarily to every named brand. Specific formulations vary by SKU and may have changed since this record was written; consult the brand's current ingredient label before drawing brand-level conclusions.","sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-25"},{"type":"regulation","title":"EPA FIFRA (Phosphine/AlP) + OSHA Confined Space + FDA Tolerance (FIFRA; 29 CFR 1910.146; 40 CFR 180.225)","jurisdiction":"USA","citation":"FIFRA; 29 CFR 1910.146; 40 CFR 180.225","id":"src_b251248a"},{"id":"src_001","type":"reference","title":"ATSDR Toxicological Profile — CAS 7803-51-2","url":"https://www.atsdr.cdc.gov/toxprofiledocs/index.html","notes":"Toxicological profile and health effects summary","inherited_from_compound":"hq-c-ino-000163"},{"type":"regulatory","title":"US Food and Drug Administration (FDA)","jurisdiction":"USA","id":"src_82d1cfcd","extraction":"description_reference"},{"type":"regulatory","title":"US Environmental Protection Agency (EPA)","jurisdiction":"USA","id":"src_defdd418","extraction":"description_reference"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:22:37.909Z"}}