Cauliflower

Completeness scorecard

Deterministic gap audit — no score is composite, no cell is LLM-judged. Each chip is re-derivable by re-running tools/evidence/build-ingredient-scorecard.mjs. review: residuals and missing data are worked autonomously via data/evidence/ingredient-scorecard-review-flags.csv and wiki/completeness-gaps.md.

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 116, “Cauliflower, fresh/frozen, boiled.” fda2022-tds-elements-fy2018-fy2020

Why this commodity accumulates heavy metals

Cauliflower is a Brassica vegetable that accumulates cadmium primarily through root uptake from soil, a pathway common to the crucifer family. Brassicas express metal-binding proteins and organic acid secretions that actively mobilise cadmium and other divalent cations from the rhizosphere, making them moderate cadmium accumulators relative to other vegetables. The dense, compact head structure of cauliflower limits direct atmospheric deposition of lead onto edible surfaces, unlike leafy greens where large surface-area-to-mass ratios drive leaf-surface Pb contamination. Soil cadmium concentration, pH (lower pH increases cadmium availability), and phosphate fertiliser history are the primary agronomic drivers of cauliflower cadmium load. Nickel uptake follows a similar root-uptake pathway and is detectable in some surveys; the FDA Total Diet Study FY2018-FY2020 found Ni in the 90th-percentile sample at 97 ppb (wet weight, n=27) 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 shows the top 2-3 contributing sources by year and sample size, with numbered wikilink aliases.

Synthesis basis and censoring treatment

The lead, total-arsenic, total-mercury, and chromium cells were resynthesized on 2026-06-11 on a cauliflower fresh/frozen/boiled wet-weight basis, the form FDA Total Diet Study Food 116 reports and the form in which the vegetable is consumed. Values below the analytical limit of detection or quantification are treated as left-censored, not as measured zeros. The earlier profile reported all four of these analytes at typical and 95th-percentile values of zero at high confidence; those figures were an artifact of the FDA Total Diet Study composite for “Cauliflower, fresh/frozen, boiled” (n=27), in which every sample (or all but one) fell below the reporting limit and the reported below-limit results were pooled as literal zeros (FDA 2022; reporting limits Pb 4, tAs 3, tHg 1, Cr 50 µg/kg). The resynthesis replaces the literal zeros with the honest FDA censored floor expressed as a left-censored bound, and recovers what the broader cauliflower-specific occurrence literature supports at the upper end. The honest floor for each analyte is the FDA reporting limit, not a measured zero.

Lead rests on the FDA censored floor plus two cauliflower-specific positive surveys, both on a dry-weight basis and both from contaminated growing contexts that are not directly comparable to the FDA boiled-wet-weight composite. The Indian market-basket survey (Salhotra et al. 2017, single composite, Jagdalpur, Chhattisgarh) reports cauliflower lead at 0.92 mg/kg dry weight, the highest lead among the five vegetables it measured. The Bangladeshi survey of the industrialized Bogura district (Samma et al. 2024) reports cauliflower lead ranging 4.76 to 22.84 mg/kg dry weight, exceeding the Bangladesh Food Safety Authority maximum across all sites; these are industrial-district outlier values and are stratified out of the headline cell rather than pooled into it. No cauliflower-specific lead measurement on a wet-weight or boiled basis exists in the corpus, so the lead cell is published as a left-censored floor (typical [0, null]) at low confidence with no upper bound or 95th-percentile, with the dry-weight detected values carried in prose as evidence that cauliflower lead is low but non-zero in fresh produce. The pooled lead distribution moves toward the literature, away from the prior literal-zero cell, but is not given a false wet-weight quantile that the sources do not support.

Total arsenic rests on the FDA censored floor alone: the FDA TDS composite is below the 3 µg/kg reporting limit across all 27 samples, and no cauliflower-specific positive arsenic measurement exists in the corpus. The total-arsenic cell is therefore a left-censored floor (typical [0, null]) at low confidence with a single contributor. Total arsenic is held distinct from inorganic arsenic, which remains a reviewed data gap because no speciated measurement exists for this ingredient.

Total mercury rests on the FDA censored floor and a corroborating broad-survey non-detect. FDA reports cauliflower mercury below the 1 µg/kg reporting limit across all 27 composites. The New Zealand market-garden survey (Dearing et al. 2025) reported mercury below its 0.01 mg/kg fresh-weight limit of detection in all 153 vegetable composites across seventeen genera (including the Brassica group that contains cauliflower); that survey reports mercury only at the whole-survey level and not for cauliflower specifically, so it is carried as a broad-vegetable corroborating non-detect rather than as a cauliflower value. The total-mercury cell is a left-censored floor (typical [0, null]) at low confidence. Total mercury is held distinct from methylmercury and is not derived from it.

Chromium is reported as total chromium only at low confidence; no cauliflower hexavalent-chromium measurement exists in the corpus, and Cr-VI is never inferred from total chromium. The FDA TDS composite reports 26 of 27 samples below the 50 µg/kg reporting limit, with a single detect carrying the maximum to 600 µg/kg and the 95th-percentile still at the reporting floor. The cauliflower-specific positive anchor is the Nigerian market survey (Imongben et al. 2026, Kaduna Metropolis), which reports cauliflower total chromium at 12.1 mg/kg dry weight; this is a dry-weight value from a market where every vegetable except carrot exceeded the cited 0.3 mg/kg EU reference, so it sits well above the FDA wet-weight floor and is not pooled into a wet-weight quantile. The chromium cell is published as a left-censored floor (typical [0, null]) at low confidence, with the dry-weight detect and the single FDA wet-weight tail (max 600 µg/kg) carried in prose. The Bangladeshi survey reported cauliflower chromium from below detection upward, with the highest chromium in tomato rather than cauliflower, and is not a cauliflower chromium anchor.

Across all four cells the dominant cauliflower-specific positive data are dry-weight surveys from industrialized or contaminated growing regions in South Asia and West Africa, which cannot be relabeled as US boiled-wet-weight values and are not folded into the headline percentiles. The wastewater-irrigated Indian survey (Jitender et al. 2017) measured cauliflower under domestic-wastewater irrigation in Hisar district, reporting elevated zinc and a chromium transfer factor for cauliflower; its cauliflower values are an exposure-pathway outlier for wastewater-irrigated produce and are excluded from the occurrence headline. The broad Chinese retail survey (Wu 2024) reported only category-level means for an all-vegetable pool and a combined brassica “kale” group of cauliflower, cabbage, and broccoli; it carries no cauliflower-specific row and is treated as broad-vegetable context, not a cauliflower value.

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 “Cauliflower, fresh/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.

Ranges by source, region, and variety

The FDA Total Diet Study FY2018-FY2020 provides the primary quantitative baseline for cauliflower in the US market, reporting cadmium concentrations with a median of 11 ppb and a 90th percentile of 18.4 ppb (n=27, wet weight) fda2022-tds-elements-fy2018-fy2020. Lead, total arsenic, and total mercury were below their reporting limits (4, 3, and 1 ppb respectively) in all 27 TDS composites, and chromium was below the 50 ppb reporting limit in 26 of 27 with a single detect carrying the maximum to 600 ppb; these are left-censored bounds rather than measured zeros, so they constrain the boiled-cauliflower metal burden from above rather than establishing it at zero. The low US lead result is consistent with the protected head structure of cauliflower limiting atmospheric Pb deposition, but cauliflower lead is low rather than absent: market-basket surveys that measured cauliflower by name in India (Salhotra et al. 2017, 0.92 mg/kg dry weight) and in the industrialized Bogura district of Bangladesh (Samma et al. 2024, 4.76 to 22.84 mg/kg dry weight) detect appreciable lead, and the Bangladeshi values exceed regulatory limits as an industrial-district outlier. Nickel was detectable at the 90th percentile (97 ppb) but below the reporting limit at the median, indicating a skewed distribution with a subset of samples from higher-Ni-soil origins fda2022-tds-elements-fy2018-fy2020. Chromium in the Nigerian Kaduna market survey reached 12.1 mg/kg dry weight in cauliflower (Imongben et al. 2026), again a dry-weight value from a contaminated market rather than a US wet-weight equivalent. Geographic variation in metal load is expected to be moderate to high across growing regions given differences in soil background, fertiliser inputs, and irrigation water quality, with wastewater-irrigated and industrial-district produce carrying the heaviest burdens; the current corpus supports a clean separation between the low US boiled-cauliflower baseline and these contaminated-region dry-weight outliers, but not a fully resolved region-by-region wet-weight breakdown for cauliflower specifically.

Processing effects

Boiling is the standard preparation method for cauliflower and is the basis reported in the FDA Total Diet Study (“Cauliflower, fresh/frozen, boiled”) fda2022-tds-elements-fy2018-fy2020. Boiling leaches cadmium and other water-soluble metal species into cooking water; studies on related Brassicas (broccoli, cabbage) indicate that boiling can reduce cadmium content in the edible portion by 20-40% relative to raw, depending on cooking time and water volume, though the magnitude for cauliflower specifically is not quantified in the current corpus. Discarding the cooking water rather than using it as broth or stock is therefore relevant for cadmium reduction. Washing fresh cauliflower before cooking removes surface soil contamination but has minimal effect on internalized cadmium. Blanching and freezing prior to retail does not materially alter the metal distribution within the floret tissue.

Ingredient-derivative risk

Cauliflower is consumed primarily as a whole vegetable (fresh, frozen, or as part of prepared dishes). Processed derivatives include cauliflower rice (raw riced florets), cauliflower flour (dried and milled), and cauliflower-based pizza crusts and flatbreads. Drying and milling concentrate metals on a dry-weight basis relative to fresh-weight values; a drying step that removes roughly 90% of water could increase apparent cadmium concentration approximately ten-fold on a dry-weight basis. Cauliflower rice retains the intact floret tissue and carries a similar metal profile to fresh cauliflower on a wet-weight basis. These derivatives are not currently individually characterised in the corpus; values from the whole-vegetable data should be treated as indicative but not directly equivalent for dried or highly processed cauliflower products.

Mitigation options

Sourcing levers

Sourcing cauliflower from regions with low background soil cadmium and documented low phosphate fertiliser use reduces cadmium load at the ingredient level. Supplier specification of soil cadmium levels or adherence to the EU cadmium maximum for vegetables (0.050 mg/kg fresh weight per eu-2023-915-cadmium) provides a regulatory floor. Certified organic production does not automatically imply lower cadmium; soil history is the determinant.

Agronomic levers

Maintaining soil pH above 6.5 reduces cadmium bioavailability to Brassica crops by shifting cadmium to less plant-available forms. Liming acidic soils is the most widely documented lever for reducing cadmium uptake in vegetables; magnitude of effect varies by soil type and cadmium speciation. Selection of lower-accumulating cultivars is an emerging lever documented for other Brassicas but not yet characterised for cauliflower varieties specifically in the current corpus.

No quantified data on cultivar selection for cauliflower cadmium in the current corpus; section will be expanded when relevant evidence is ingested.

Processing levers

Boiling in a high water-to-vegetable ratio and discarding the cooking water reduces cadmium in the edible portion, based on analogous data from broccoli and cabbage. Washing before cutting reduces surface contamination. These are low-cost, high-availability levers for food service and home preparation contexts.

Formulation levers

No quantified data on this lever in the current corpus; section will be expanded when relevant evidence is ingested.

Testing and QC levers

Lot-level cadmium testing by ICP-MS is appropriate for manufacturers using cauliflower in concentrated or dried formats where the amplification effect on dry weight may push values closer to applicable regulatory limits. For fresh whole cauliflower at typical consumption volumes, the TDS median cadmium (11 ppb wet weight) is well below EU and Codex regulatory ceilings; routine lot testing is lower priority unless sourcing from regions with documented elevated soil cadmium.

Packaging and storage levers

No quantified data on this lever in the current corpus; section will be expanded when relevant evidence is ingested.

Regulatory limits that apply

The EU Regulation (EC) No 2023/915 (eu-2023-915-cadmium) sets a maximum level of 0.050 mg/kg fresh weight for cadmium in fresh vegetables of the Brassica genus, which includes cauliflower. The lead maximum level for fresh vegetables under the same regulation is 0.10 mg/kg fresh weight. No specific US FDA action level applies to lead or cadmium in fresh cauliflower; the FDA Closer to Zero program (fda-closer-to-zero) is focused on infant and toddler foods rather than fresh vegetables. The Codex general standard for contaminants (CXS 193-1995, codex-cadmium-mls) provides an international cadmium maximum of 0.050 mg/kg for Brassica vegetables. The FDA TDS median Cd value of 11 ppb is approximately 22% of the EU maximum level, indicating typical US market cauliflower is well within regulatory limits on average.

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]*.

Page history

The five most recent substantive edits to this page. The full version history lives in git; when DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.