Pork chop

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 18, “Pork chop, pan-cooked with oil.” fda2022-tds-elements-fy2018-fy2020

Why this commodity accumulates heavy metals

Pork chop is a cut of pork loin or rib, comprising skeletal muscle with associated intramuscular fat and, depending on the cut, a bone. The heavy metal profile of pork loin muscle is among the lowest observed in the monitored food supply. Cadmium in mammals distributes preferentially to the renal cortex (kidney) and liver after intestinal absorption, with skeletal muscle retaining only a small fraction of the body burden; as a result, pork loin muscle Cd is consistently near or below analytical detection limits in food monitoring surveys. Lead distributes primarily to bone and other calcified tissue after absorption, with skeletal muscle again retaining very little. Total mercury in pork muscle is negligible because terrestrial pigs are not exposed to methylmercury, the marine bioaccumulation form; any tHg reflects inorganic mercury in feed at trace background levels.

Feed composition is the primary determinant of pork muscle metal content. Commercial swine compound feed is regulated for cadmium content in the EU and under Codex standards to prevent accumulation in edible tissues; compliance with these regulations effectively caps the dietary Cd input to pigs and limits the Cd that can distribute to muscle. The FDA TDS FY2018-FY2020 data for pan-cooked pork chop (TDS Food 18, n=27) reported every measured analyte (Cd, Cr, Ni, Pb, U, tAs, tHg) below its reporting limit across all 27 samples (fda2022-tds-elements-fy2018-fy2020, reporting limits Pb 4, Cd 1, tAs 3, tHg 1, Ni 40, Cr 50, U 1 µg/kg); those below-limit results are carried as left-censored bounds rather than as measured zeros (see the Synthesis basis and censoring treatment section). The detected-occurrence picture for pork muscle is one of low but non-zero lead, cadmium, and total arsenic from broader meat-group monitoring, consistent with the well-established low-accumulator characterisation of skeletal muscle rather than with literal zeros.

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, cadmium, total-arsenic, total-mercury, nickel, chromium, and uranium cells were resynthesized on 2026-06-11 on a pork-muscle pan-cooked wet-weight basis, the form FDA reports for this matrix and the form in which the cooked cut reaches the plate. Values below the analytical limit of detection or quantification are treated as left-censored, not as measured zeros.

The earlier profile reported all seven of these analytes at typical and 95th-percentile values of zero at high confidence with n=2. Those figures were an artifact of the FDA Total Diet Study FY2018-FY2020 composite for “Pork chop, pan-cooked with oil” (TDS Food 18, n=27), in which every sample fell below the reporting limit for each metal and the reported below-limit results were pooled as literal zeros (fda2022-tds-elements-fy2018-fy2020, reporting limits Pb 4, Cd 1, tAs 3, tHg 1, Ni 40, Cr 50, U 1 µg/kg). The resynthesis replaces the literal zeros with left-censored bounds at the FDA reporting limit (reported in the profile table as “<4”, “<1”, and so on) and, where a positive occurrence value exists in the broader meat literature, carries that value as the upper anchor at low confidence.

The only positive occurrence values that touch this commodity come from the Jilin Province total diet study (Wang et al. 2020), and they are reported for the whole “Meat and its products” food group, not for pork chop specifically: group means of Pb 38 µg/kg (0.038 mg/kg), total arsenic 18 µg/kg (0.018 mg/kg), and cadmium 8 µg/kg (0.008 mg/kg). These are carried as the upper anchor of the typical range and as the only available 95th-percentile reference for Pb, Cd, and tAs, but they are an all-meat aggregate spanning pork, beef, poultry, and processed meats; they are not a pork-chop-specific distribution. Confidence is held at low for every cell on that basis, and no value is relabeled as a pork-chop subgroup figure. The second corroborating result is the Kazakh market-meat survey (Maikanov et al. 2021, pork n=67), in which pork was below detection for arsenic, cadmium, mercury, and lead across the four target analytes; that is a second censored negative pork result, consistent with the FDA censoring, and it does not supply a positive value.

Total arsenic and inorganic arsenic are kept as distinct analytes; no speciated measurement exists for this commodity, so iAs remains a reviewed data gap and is not derived from total arsenic. Total mercury is held distinct from methylmercury and is not derived from it: both the FDA composite and the Kazakh pork samples returned total mercury below the reporting limit, so the total-mercury cell carries only the left-censored FDA floor of <1 µg/kg with no positive upper bound, at low confidence.

Nickel and chromium each rest on the FDA censored floor alone. Every pork-chop composite in the FDA Total Diet Study fell below the 40 µg/kg nickel and 50 µg/kg chromium reporting limits, so the honest floor for each is that reporting limit expressed as a left-censored bound, with no positive occurrence value or upper bound published for the commodity. Chromium is reported as total chromium only at low confidence; no fluid-pork hexavalent-chromium occurrence measurement exists. The single chromium-speciation source in the corpus (Ren et al. 2018) is an in-vitro electron-beam mitigation experiment in which lean pork was spiked with potassium dichromate to defined Cr(VI) levels, not a survey of naturally occurring chromium; its finding that lean pork retains only 2 to 4 percent of total Cr(VI) as free, unbound Cr(VI) is a speciation and mitigation result, not an occurrence value, and it is not used to populate the chromium cell. No Cr-VI value is inferred. Uranium is recorded as a reviewed data gap: FDA reports it below the 1 µg/kg reporting limit across all 27 composites with no extractable quantitative value and no other source measures it in pork, so no distribution is published (the rice-uranium and whole-milk-uranium precedent).

Ranges by source, region, and variety

Detected occurrence values for pork muscle are scarce; the available US and Central-Asian monitoring data report pork at or below analytical detection limits, and the only positive figures come from a broad all-meat food-group composite rather than a pork-specific distribution. The FDA TDS FY2018-FY2020 data (n=27) for pan-cooked pork chop in the US reported every analyte (Cd, Cr, Ni, Pb, U, tAs, tHg) below its reporting limit throughout the distribution (fda2022-tds-elements-fy2018-fy2020); these are left-censored bounds, not measured zeros. The Kazakh market-meat survey (Maikanov et al. 2021, pork n=67) likewise reported pork below detection for arsenic, cadmium, mercury, and lead. The single set of positive numbers comes from the Jilin Province total diet study, where the all-meat group mean was Pb 38, tAs 18, and Cd 8 µg/kg (Wang et al. 2020); because this is a composite across pork, beef, poultry, and processed meats, it bounds the pork-chop estimate from above but cannot resolve variation by production region, breed, or production system (indoor vs outdoor, organic vs conventional), none of which is documented in the current corpus for pork muscle.

Processing effects

Pan cooking with oil, as in the TDS preparation protocol, drives moisture loss from the muscle and concentrates metals slightly on a wet-weight basis. Given that every measured analyte fell below its reporting limit in the n=27 TDS samples (fda2022-tds-elements-fy2018-fy2020), this concentration effect is not analytically resolvable in the FDA data; it would shift any underlying low but non-zero muscle concentration upward only slightly. Marinating in acidic solutions (wine, vinegar) does not mobilise metals from the muscle matrix at concentrations relevant to food safety. Bone-in chops carry bone tissue, which has higher Pb than muscle; consuming the bone tissue or bone marrow is not standard, and the bone fraction does not affect the muscle-tissue profile.

Ingredient-derivative risk

Pork loin as a raw material is the base form. Pork loin used as an ingredient in composite meat products (reformed pork products, pre-marinated chops) carries the same low metal profile as raw loin muscle. Ground pork that includes loin as one component maintains a low metal profile unless organ meat (liver, kidney) is included in the blend, in which case organ-meat metal concentrations dominate. Pork loin broth or cooking jus would carry water-soluble metal fractions leached from the muscle, but given near-zero muscle concentrations, broth metal concentrations are expected to be very low.

Mitigation options

Sourcing levers

Feed Cd compliance is the primary upstream control for pork muscle Cd, and is managed through feed regulation rather than by buyers of the finished meat cut. No evidence supports geographic sourcing as a lever for pork chop metal concentrations specifically.

Agronomic levers

Not applicable to pork chop as a slaughterhouse-derived muscle cut. Feed raw material quality management (specifically phosphate ingredient Cd screening) is the upstream lever at the feed-manufacture stage.

Processing levers

No processing lever is required or documented for pork chop, given that metal concentrations in the muscle are consistently at zero across a 27-sample US dataset. The standard butchering practice of separating bone-in from boneless cuts does not affect muscle metal concentrations.

Formulation levers

Pork chop is not typically a fractional ingredient in composite products. Where pork loin trimmings are used in composite products, their low metal contribution does not require mitigation.

Testing and QC levers

Routine heavy metal testing of pork chop for QA purposes is not expected to be a primary programme requirement given the all-zero TDS dataset. Where regulatory compliance testing is required for EU exports (EU Cd ML for pork muscle: 0.050 mg/kg), ICP-MS testing of representative loin samples provides the required documentation.

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

Under EU Regulation (EU) 2023/915 (eu2023-contaminants-maximum-levels), the maximum level for cadmium in pork muscle meat is 0.050 mg/kg fresh weight, and for lead in pork muscle meat is 0.10 mg/kg fresh weight. These apply to pork chop as a cut of pork muscle. Pork organ meats (kidney, liver) carry higher, separate regulatory limits for Cd that are not applicable to this page but are cross-referenced on the relevant organ-meat pages.

No US FDA action level for Cd or Pb in pork muscle applies under the current regulatory framework. FDA Closer to Zero (fda-closer-to-zero) does not list pork chop as a priority category. Codex Alimentarius Cd ML for muscle meat applies; the relevant Codex document is codex-cadmium-mls.

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 “Pork chop, pan-cooked with oil” (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.

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.