Corn

This ingredient stub was created during the FDA FY2018-FY2020 Total Diet Study element-results ingest so future source ingests have a stable destination for this food matrix. FDA reports this item as TDS Food 54, “Corn, frozen, boiled.” fda2022-tds-elements-fy2018-fy2020

Heavy metal contamination profile

Per-analyte snapshot derived from the machine-readable contamination_profile in the frontmatter above. data gap indicates the literature has been reviewed for this commodity-analyte combination and no usable occurrence data was found (a finding, not a placeholder). The Key sources column is populated by the per-metal body sections below where they exist; an automated Phase 3 enrichment will lift attributions into this table.

Analyte	Coverage	Typical (ppb)	p95 (ppb)	Confidence	Key sources
Pb	n=1 (in progress)	—	—	—	—
Cd	n=1 (in progress)	—	—	—	—
iAs	data gap	—	—	—	—
tAs	n=1 (in progress)	—	—	—	—
tHg	n=1 (in progress)	—	—	—	—
Ni	n=1 (in progress)	—	—	—	—
Al	data gap	—	—	—	—
Cr	n=1 (in progress)	—	—	—	—
Sn	data gap	—	—	—	—
U	n=1 (in progress)	—	—	—	—

FDA TDS FY2018-FY2020 Evidence

The normalized row-level data for this TDS food is stored in data/evidence/fda_tds_fy2018_2020_element_results_samples.csv, with per-food/per-analyte summaries in data/evidence/fda_tds_fy2018_2020_summary_by_food_analyte.csv. Concentrations are retained as FDA reported them, with the reporting-limit column preserved separately; reported zeroes are not rewritten as <LOD unless a source explicitly says to do so. fda2022-tds-elements-fy2018-fy2020

Routing

This node is linked from the ingredient index and the FDA TDS source routing table.

Contamination Profile State

The machine-readable contamination profile is in_progress for analytes measured in the TDS file and pending for profile metals not measured by this source. Ingredient-level values belong here once cross-source synthesis is reviewed; product-category values belong on the relevant product page.

FDA TDS FY2018-FY2020 Occurrence Values

FDA Total Diet Study FY2018-FY2020 reports prepared/composite-food concentration distributions for this ingredient as TDS food “Corn, frozen, boiled” (fda2022-tds-elements-fy2018-fy2020). Values are in ppb-equivalent on the basis FDA reported. The full sample-level data are stored in data/evidence/fda_tds_fy2018_2020_element_results_samples.csv; per-analyte distributions in data/evidence/fda_tds_fy2018_2020_summary_by_food_analyte.csv. These distributions count as one source under persistent-wiki-ingest-rule synthesis discipline; numerical values stay in body scratch until a second independent source is integrated.

Metal	n	min	p10	p50	p90	p95	max	Schema
Cd	27	0	1.36	2.6	3.54	3.81	4.8	in profile
Cr	27	0	0	0	0	0	0	in profile
Ni	27	0	0	0	54.4	60.1	160	in profile
Pb	27	0	0	0	0	0	0	in profile
U	27	0	0	0	0	0	0	in profile
tAs	27	0	0	0	0	0	0	in profile
tHg	27	0	0	0	0	0	0	in profile

Sources

Auto-generated from source-page frontmatter. The “Used on this page for” column is populated by the orchestrator’s POPULATE-SOURCE-LEGEND action; pending entries appear as *[awaiting synthesis]*.

#	Citation	Year	Type	Used on this page for
1	Hassan et al. 2025. Cornflakes as a source of dietary metal exposure in Lebanon: Risk assessment and regulatory compliance, RSC Advances	2025	Peer-reviewed	Measured tAs, Cd, Cr, tHg, and Pb in 42 commercial cornflake products from Lebanese retail; Cr showed the highest mean concentrations; risk assessment for adult and child consumers
2	Romero-Crespo et al. 2023. Heavy metals in soils and crops in a mining area of Ecuador, Environmental Geochemistry and Health	2023	Peer-reviewed	Measured As, Cd, Cr, Cu, Ni, Pb, and Zn in food crops including corn near mining operations in Ecuador; mining-area contamination transfer into maize grain
3	FDA 2022. FY2018-FY2020 TDS Elements Analytical Results, FDA Total Diet Study	2022	Government dataset	Primary occurrence data for Pb, Cd, Ni, Cr, U, tAs, and tHg in corn-based TDS food items (TDS Food varies; n varies by analyte)