p4-batch15-2026-05-13

P4 Batch 15 — Ingest Report (2026-05-13)

Positions 4768–4967 of the P4 manifest, sorted by (-year, handle). Year band: 2022. All four groups committed cleanly without lock contention.

Summary

Group	Positions	Commit	Pages	FP	FP rate
g1	4768–4817	531487a	3	47	94%
g2	4818–4867	7c3dcee	8	42	84%
g3	4868–4917	63a84a1	3	47	94%
g4	4918–4967	3153dee	5	45	90%
Total	4768–4967		19	181	90.5%

Source pages by group

G1 — 3 pages (positions 4768–4817)

1. jaiswal2022-yamuna-heavy-metals-health-risk — Yamuna River Cr up to 18.28 µg/L in monsoon season feeding irrigation water for agricultural districts supplying much of Delhi’s food; children’s HI exceeded 1 at most non-monsoon sites from cumulative multi-metal exposure
2. vainio2022-baltic-mercury-food-web — Baltic Sea pelagic food-chain TMF 3.58–4.02 vs benthic TMF 2.11–2.34; single-TMF risk models systematically underestimate pelagic exposure; Baltic herring tHg 0.035 µg/g ww, pike 0.15 µg/g ww (approaches EU limit at upper range)
3. li2022-wheat-pte-guizhou-health-risk — wheat grain mean Cr 3,250 µg/kg from Guizhou karst geological background (3.25× FAO limit); 58.4% of samples exceed limit; geogenic rather than industrial; children’s probabilistic HI 2.57; supply-chain sourcing flag for SW China wheat

G2 — 8 pages (positions 4818–4867)

4. duarte2022-arsenic-cancer-argentina — dietary As exposure and cancer incidence in high-As-groundwater regions of Argentina; strengthens iAs health-endpoint literature for regulations pages
5. alemu2022-wheat-flour-metals-ethiopia — Pb, Cd, Cu, Mn, Fe in Ethiopian wheat flour from mills and markets; documents flour-milling as a contamination transfer step
6. mawari2022-heavy-metals-fruits-vegetables-india — multi-metal survey of fruits and vegetables at Indian retail; Pb and Cd exceeded FSSAI limits in leafy vegetables from multiple markets
7. kim2022-bsf-larvae-oil-eggs-heavy-metals — black soldier fly larvae as feed ingredient; Cd and Pb bioaccumulation in larvae fed contaminated organic substrates; Cd in BSF-derived egg yolks from laying hens
8. signes-pastor2022-arsenic-respiratory-children-spain — in a low-As-water Spanish cohort, dietary iAs (primarily from rice) at median urinary ΣAs of 4.92 µg/L associated with increasing trend in childhood respiratory symptoms; strengthens iAs-in-rice case even in low-drinking-water-exposure contexts
9. liu2022-heavy-metals-rice-maize-chengdu — 78% of grain samples in Chengdu Plain (Sichuan) failed China national Cd limit; mean rice Cd 0.46 mg/kg DW (2.3× limit), maximum 1.78 mg/kg; the most extreme Cd-in-rice contamination dataset in the current corpus; directly relevant to the geographic_breakdown sub-field for Chinese industrial-region rice
10. braeuer2022-mercury-selenium-mushrooms-la-icpms — porcini mushrooms (Boletus edulis) accumulate Hg up to ~20 µg/g DW (~40× background), confirmed by LA-ICP-MS with method validation; mushrooms are largely absent from food-chain Hg discussions that focus on seafood; establishes porcini as a significant Hg exposure route for frequent consumers in Europe; first high-quality mushroom Hg paper in the corpus
11. qu2022-lead-cadmium-drinking-water-soil-china — Pb and Cd in rural Chinese drinking water sources and adjacent soils; co-contamination pattern; children’s risk assessment

G3 — 3 pages (positions 4868–4917)

12. hahn2022-salish-seaweed-contaminants — Cd exceeded international limits at all 43 Salish Sea sampling sites; bull kelp (Nereocystis luetkeana) mean Cd 5.69 mg/kg DW, more than double the most permissive international limit; tAs reached 72.5 mg/kg DW in bull kelp; authors note tAs is predominantly organic arsenosugars with iAs typically 1–5% of tAs — iAs/tAs non-substitutability demonstrated in practice; Pb spike to 13.2 mg/kg at one industrial-adjacent site
13. siegel2022-appalachian-groundwater-arsenic — 216 domestic wells in Ohio and West Virginia; As exceeded EPA MCL in 6.8%, Mn exceeded health advisory in 7.3%; attributable to natural geochemical processes (alkaline ion-exchange groundwaters), not oil and gas activity; background exposure context for rural US populations
14. berky2022-wildgame-lead-peru — Pb from ammunition fragmentation in hunted wild game plus Hg from piscivorous fish in indigenous Amazonian communities; ~500 µg Pb per meal from game; dual cumulative burden (Pb + MeHg) in subsistence-fishing, hunting-dependent populations; strengthens multi-metal cumulative exposure framing

G4 — 5 pages (positions 4918–4967)

15. wu2022-selenized-yeast-laying-hens — Pb, Cd, Hg, Cr accumulation in egg yolk and white from gavage experiment, n=160 laying hens; GFAAS + DMA-80; relevant to egg contamination from feed
16. tan2022-carbon-dots-cd-hg-food — fluorescence sensor for simultaneous Cd and Hg in apple and cabbage; LOD 0.20 µM Cd, 0.188 µM Hg; recovery 86–115%; A-tier methods paper
17. lizama2022-chilean-altiplano-water — 10-year (2008–2018) monitoring showing most Chilean Altiplano-Puna stations exceeded domestic drinking water standard for As; geogenic volcanic origin; irrigation water pathway to altiplano crops
18. shi2022-sulfur-as-cd-wheat — sulfur fertilization reduces As and Cd root-to-shoot translocation in wheat via vacuolar sequestration; cites iAs occurrence data from India, Pakistan, Argentina wheat grain; agronomic mitigation evidence
19. ali2022-lead-wastewater-crops-meta — meta-analysis of 24 studies, 13 countries, Pb in wastewater-irrigated soil and 44 crop types; HRI >1 for adults in India, Iraq, Morocco, Egypt from untreated-wastewater-grown vegetables; all untreated-wastewater vegetables exceeded WHO edibility limits

New page proposals

No ingredient or product pages crossed the creation threshold from this batch alone. Two candidates are building:

Wild mushrooms (porcini) — braeuer2022 is the first high-quality paper in the corpus measuring Hg in edible mushrooms. The result (up to 20 µg/g DW) is substantially above background and warrants tracking. Flag for next encounter; threshold for a mushroom Hg page requires 2 more papers.

Seaweed/kelp contamination — hahn2022 (Salish Sea Cd at all sites) plus nepper-davidsen2023 (batch 13, NZ kelp) are now 2 papers on seaweed heavy metal contamination. One more paper crosses the threshold for an ingredient page.

Synthesis threads

Seaweed/kelp as a systematic Cd and As exposure pathway — new seeding

Batch 15 adds hahn2022-salish-seaweed-contaminants (Cd above international limits at all 43 Salish Sea sites; bull kelp mean 5.69 mg/kg DW Cd), combined with nepper-davidsen2023-kelp-biomass-composition-nz from batch 13 (NZ kelp, mean tAs 49 ppm DW, Cd 1.2 ppm DW). Two A-tier papers now document elevated Cd and As in Pacific-basin seaweed species. The existing promoted organoarsenical-inertness-assumption synthesis page covers the arsenosugar/iAs speciation question in seaweed; the Cd angle is distinct and not yet captured in any synthesis page. This is 2 of 4 criteria met (criterion 1 borderline at 2 sources; criterion 3 non-obvious — consumer seaweed products are often marketed without heavy metal characterization). Add to synthesis-proposals as a seeding entry.

Mining-impacted freshwater fish (promoted candidate — 3 of 4 criteria met)

berky2022-wildgame-lead-peru adds a dual-burden (game Pb + fish MeHg) finding from indigenous Amazonian communities, strengthening the cumulative exposure framing. The mechanism for Pb is ammunition fragmentation rather than ASGM, so it does not directly advance the ASGM multi-metal criterion. The synthesis thread remains at 3 of 4 criteria met; ASGM-plus-Pb/Cd paper still needed.