Overview
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.” FY2018-FY2020 TDS Elements Analytical Results
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) FY2018-FY2020 TDS Elements Analytical Results.
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.
| Analyte | Coverage | Typical (ppb) | Confidence | Key sources |
|---|---|---|---|---|
| Pb | n=1 dataset; composites=27 | ND (<4; source reporting limit) | low | 1 |
| Cd | n=2 | 5.9–18.4 | low | 1 |
| iAs | data gap | — | — | — |
| tAs | n=1 dataset; composites=27 | ND (<3; source reporting limit) | low | 1 |
| tHg | n=1 dataset; composites=27 | ND (<1; source reporting limit) | low | 1 |
| Ni | n=2 | 0–97 | low | 1 |
| Al | data gap | — | — | — |
| Cr | Source context | Not quantified | — | — |
| Sn | data gap | — | — | — |
| U | n=2 | 0 | low | — |
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. FY2018-FY2020 TDS Elements Analytical Results
Routing
This node is linked from the ingredient index and the FDA TDS source routing table.
Contamination Profile State
Per-analyte state — populated, in progress, or declared data gap — is carried authoritatively in the machine-readable contamination_profile frontmatter and the contamination-profile table above. Ingredient-level values belong here; finished-product values belong on the relevant product-category page.
FDA TDS FY2018–FY2020 source observations
FDA measured the prepared foods named below. Each row describes that food and preparation, not every form of this ingredient. Values are µg/kg (ppb) on the FDA sample basis. ND means not detected; it is not a measured zero. Reporting limits can vary between composites. FY2018-FY2020 TDS Elements Analytical Results
| FDA food and preparation | Analyte | Composites | Detected | Detected concentrations (ppb) | Reporting limits (ppb) |
|---|---|---|---|---|---|
| 116: Cauliflower, fresh/frozen, boiled | tAs | 27 | 0 | ND in all composites | 3 |
| 116: Cauliflower, fresh/frozen, boiled | Cd | 27 | 27 | 3.5–28 | 1 |
| 116: Cauliflower, fresh/frozen, boiled | Cr | 27 | 1 | 600 | 50 |
| 116: Cauliflower, fresh/frozen, boiled | Pb | 27 | 0 | ND in all composites | 4 |
| 116: Cauliflower, fresh/frozen, boiled | tHg | 27 | 0 | ND in all composites | 1 |
| 116: Cauliflower, fresh/frozen, boiled | Ni | 27 | 12 | 53–150 | 40 |
| 116: Cauliflower, fresh/frozen, boiled | U | 27 | 2 | 1.4–1.9 | 1 |
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 (n=27, wet weight) and a right-skewed distribution extending into the upper tail FY2018-FY2020 TDS Elements Analytical Results. Lead was below the reporting limit in all 27 TDS samples, consistent with the protected head structure of cauliflower limiting atmospheric Pb deposition. Nickel was detectable in the upper part of the distribution but below the reporting limit at the median, indicating skewed distribution with a subset of samples from higher-Ni-soil origins FY2018-FY2020 TDS Elements Analytical Results. A survey of vegetables in Bogura, Bangladesh found elevated cadmium in soil and transfer to Brassica species in that region, though exact cauliflower-specific values from that source are pending structured extraction Evaluating Soil-Vegetable Contamination with Heavy Metals in Bogura, Bangladesh: A Risk Assessment Approach. Geographic variation in Cd load is expected to be moderate to high across growing regions given differences in soil cadmium background, fertiliser inputs, and irrigation water quality; the current corpus does not support a region-by-region 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”) FY2018-FY2020 TDS Elements Analytical Results. 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 Commission Regulation (EU) 2023/915 cadmium maximum levels) 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 (Commission Regulation (EU) 2023/915 cadmium maximum levels) 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 — Program Overview) is focused on infant and toddler foods rather than fresh vegetables. The Codex general standard for contaminants (CXS 193-1995, Codex Alimentarius — Maximum Levels for Cadmium in Food) 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.
Interpretation of source evidence
Source observations and population estimates are different. A non-detect supplies a reporting-limit bound for the tested composites. It does not show that this ingredient contains zero metal. Where a previous profile lacked matching source, species or basis support, its generic concentration has been withdrawn; the available source evidence is kept below.
Pb. FDA source observations are non-detects at the reporting limits below. They do not estimate a zero population concentration; other literature remains separate context.
Other previously cited literature is retained as context; it does not establish the withdrawn numerical profile: Evaluating Soil-Vegetable Contamination with Heavy Metals in Bogura, Bangladesh: A Risk Assessment Approach.
tAs. FDA source observations are non-detects at the reporting limits below. They do not estimate a zero population concentration; other literature remains separate context.
tHg. FDA source observations are non-detects at the reporting limits below. They do not estimate a zero population concentration; other literature remains separate context.
Cr. The former exact-zero concentration had no supported measured-zero interpretation. Source observations are retained separately; a population concentration is not quantified.
Other previously cited literature is retained as context; it does not establish the withdrawn numerical profile: Evaluating Soil-Vegetable Contamination with Heavy Metals in Bogura, Bangladesh: A Risk Assessment Approach.
References
Works cited in this page’s text, in first-appearance order. See Sources for this page’s source inventory. Each title links to its source record, which carries the ingest receipt, the extracted values, and the file hash of the document it was built from.
- FY2018-FY2020 TDS Elements Analytical ResultsDataset
- Evaluating Soil-Vegetable Contamination with Heavy Metals in Bogura, Bangladesh: A Risk Assessment ApproachPeer-reviewed
- Wastewater Irrigation and Accumulation of Heavy Metals in Vegetable Crops (Broccoli and Cauliflower)Peer-reviewed
- Effects of sewage water irrigation on heavy metals accumulation in vegetables in peri-urban areas of Faisalabad, PakistanPeer-reviewed
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 | Imongben et al. 2026. Determination of some heavy metals and their potential risk in selected vegetables on sale within Kaduna Metropolis, Kaduna State, Nigeria, World Nutrition | 2026 | Peer-reviewed | NG Cr, Mn, Fe, Co, Ni, Cu, Mo, Zn occurrence in 12 vegetable types (carrots, sweet potatoes, celery, lettuce, spinach, cabbage, broccoli, cauliflower, eggplant, avocado, peas, beans) purchased from… (n=60) |
| 2 | Abubakar et al. 2025. Effects of sewage water irrigation on heavy metals accumulation in vegetables in peri-urban areas of Faisalabad, Pakistan, Agricultural Research Reports 3(1):46–57 | 2025 | Peer-reviewed | PK Cd, Co, Pb, Cr, tHg, Cu, Ni occurrence in Three representative plants per sampled crop/site; spinach at Ghulam Muhammad Abad and cauliflower at Chokera, Faisalabad |
| 3 | Samma et al. 2024. Evaluating Soil-Vegetable Contamination with Heavy Metals in Bogura, Bangladesh: A Risk Assessment Approach, Environmental Health Insights | 2024 | Peer-reviewed | BD Pb, Cr, Cu occurrence in Composite vegetable and soil samples from 5 vegetable species across 6 upazilas in Bogura district, Bangladesh (northern industrial… (n=30) |
| 4 | Wu 2024. Contamination of Heavy Metal(Loid)S in Cereals, Vegetables, and Legumes Purchased from Local Markets of Jiaozuo, China and The Associated Health Risk Assessment, International Journal of Natural Resources and Environmental Studies, 2(1): 180-200 | 2024 | Peer-reviewed | CN Pb, Cd, Cr, tAs, tHg, Ni, Cu, Zn occurrence in 244 retail food samples purchased from 13 sampling points (6 supermarkets, 6 farmers’ markets, 1 wholesale market) across… (n=244) |
| 5 | Rahim 2023. Wastewater Irrigation and Accumulation of Heavy Metals in Vegetable Crops (Broccoli and Cauliflower), Tikrit Journal for Agricultural Sciences 23(2):162–170 | 2023 | Peer-reviewed | IQ Pb, Cd, Fe, Cu occurrence in Broccoli and cauliflower field experiment; three irrigation regimes and three replicate blocks per treatment, 2018–2019 |
| 6 | FDA 2022. FY2018-FY2020 TDS Elements Analytical Results, FDA Total Diet Study | 2022 | Government dataset | FDA TDS FY2018–FY2020 multi-element occurrence distributions for Cauliflower, fresh/frozen, boiled (n=27); detectable concentrations for Cd, Cr, Ni, U |
| 7 | Ullah et al. 2022. Health Risk Assessment and Multivariate Statistical Analysis of Heavy Metals in Vegetables of Khyber Pakhtunkhwa Region, Pakistan, Biological Trace Element Research | 2022 | Peer-reviewed | PK Pb, Cr, Cd, Cu, Zn, Ni, Fe, Mn occurrence in Nine locally grown vegetable types from three peri-urban D.I. Khan sectors: sectors X and Y irrigated with untreated… |
| 8 | Jitender et al. 2017. Heavy Metals in Soil and Vegetables and their Effect on Health, International Journal of Engineering Science Technologies | 2017 | Peer-reviewed | IN Cd, Pb, Cu, Zn, Cr, Ni occurrence in Vegetables grown on domestic-wastewater-irrigated farmland around Hisar district, Haryana, India |
| 9 | Salhotra et al. 2017. Determination of heavy metals contamination in some vegetables and fruits samples from the market of Jagdalpur, Chhattisgarh State, IOSR Journal of Applied Chemistry | 2017 | Peer-reviewed | IN Pb, Cd, Cu, Fe, Co occurrence in vegetable and fruit samples from Jagdalpur market, Chhattisgarh State, India (n=ten vegetables and fruits) |
Update history
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Additional geographic and remediation evidence
Bayan Rashid Rahim, 2023. Rahim measured lead, cadmium, iron and copper in dried edible broccoli and cauliflower heads grown under three irrigation regimes in Sulaymaniyah, Iraq. The tables preserve crop-specific differences: wastewater-irrigated broccoli had the largest listed values for the four metals, whereas cauliflower cadmium was greatest under alternating irrigation. The paired treatment summaries contribute source-native vegetable occurrence and irrigation-pathway evidence. The dried basis is not interchangeable with fresh vegetables. The experiment is site- and season-specific and does not characterize all river water, all Iraqi produce or long-term dietary exposure.
Muhammad Abubakar, 2025. Abubakar and colleagues measured seven metals in sewage water, soil, spinach and cauliflower at two peri-urban sites in Faisalabad, Pakistan. The paper reports substantial differences between the two crop/site combinations, but its design does not separate plant-species effects from location. Concentrations are retained with the source’s measurement and tissue limitations. These are localized paired environmental and crop measurements, with plant results routed as leafy-tissue evidence. They do not establish a cauliflower-head concentration, a fresh-weight concentration, or a causal reduction in biomass from metal exposure. Industrial source attribution is proposed by the authors, rather than measured by a source-apportionment experiment.