Largueza et al. 2026 — Essential and potentially toxic elements in commercial milk formulas: systematic review with meta-analysis and THQ risk assessment

Largueza and colleagues at the Federal University of Rio de Janeiro State (UNIRIO) and partner Brazilian institutions conducted a PRISMA-registered systematic review and random-effects meta-analysis (REML) of essential and potentially toxic elements in commercial milk formulas (CMF) for children aged 0 to 3 years. Thirty observational studies were synthesized qualitatively and eighteen provided sufficient data for the meta-analysis, which pooled element concentrations across three Codex Alimentarius CMF categories (infant formula IF, follow-up formula for older infants FFI, and product for young children PYC) and stratified by WHO region. Non-carcinogenic risk was assessed via the EPA Target Hazard Quotient (THQ) framework using EPA RfDo values and product-specific estimated daily intake equations. The review documents Total Target Hazard Quotient (TTHQ) values above one in several countries for all three formula categories, identifies the elements driving the excess risk on a per-country basis, and concludes that continuous monitoring of CMF is necessary to safeguard children’s health. This is the first global systematic review-with-meta-analysis covering essential elements, potentially toxic elements, and the Codex follow-up and young-children categories alongside infant formula in a single THQ framework.

Key numbers

The qualitative-synthesis corpus is 30 studies (Table 1). Geographic distribution: Asia 33% (6 studies including Turkey, Iran, Saudi Arabia, Jordan, Kuwait), Americas 33% (Brazil 5, USA 6 — six U.S. studies including Frisbie 2019, Scher 2021/2024, Mitchell 2020, Da Silva 2018; one Italian-authored study), Europe 28% (Spain 2, Italy, France, Malta — 5 studies), Africa 6% (Ethiopia, Egypt; 3 studies). One study received private funding but declared no conflict of interest. Methods of determination: ICP-MS (47% of studies), AAS (20%), ICP-OES (17%); the rest used FAAS, GF-AAS, INAA, MP-AES, or PIXE/RBS per the Table 1 method column.

The meta-analysis pooled 18 studies. Nine of the 30 included studies did not report concentrations in means with standard deviation or standard error and were excluded from the meta-analysis; three more were excluded because their reported concentration values exceeded three standard deviations from the pooled distribution of study means and lacked sufficient methodological detail to confirm analytical comparability.

Table 2 — pooled weighted-mean-difference (WMD) concentrations across all included regions (µg/kg, except Fe and Zn in mg/kg as marked with *).

For infant formulas (IF, 0-6 months): Al 946.75 µg/kg (95% CI 169.35-1724.14; N=10 studies), iAs 12.2 (5.66-18.74; N=10), Cd 4.13 (2.86-5.41; N=9), Co 11.55 (7.26-15.84; N=19), Cr 250.37 (148.97-351.77; N=10), Cu 1882.7 (1366.62-2398.77; N=25), Fe* 34.28 mg/kg (26.45-42.1; N=26), MeHg 10.26 (0-29.52; N=3), Mn 1566.66 (774.59-2358.72; N=15), Ni 131.14 (0-336.7; N=4), Pb 42.98 (7.6-78.36; N=8), Se 180.64 (132.21-229.06; N=19), U 3.19 (1.61-4.77; N=16), Zn* 26.84 mg/kg (18.25-35.43; N=15). All Iˢ² values exceeded 90% indicating substantial heterogeneity (p<0.001 throughout).

For follow-up formulas (FFI, 6-12 months): Al 740.02 µg/kg (349.23-1130.82; N=7), iAs 12.59 (6.86-18.32; N=12), Cd 3.36 (1.06-5.65; N=6), Co 7.91 (4.04-11.78; N=6), Cr 261.89 (162.26-361.52; N=9), Cu 1947.63 (1166.61-2728.65; N=12), Fe* 45.07 mg/kg (27.36-62.78; N=13), MeHg 0.39 (0-1.06; N=2), Mn 1491.78 (752.54-2231.03; N=13), Ni 406.35 (0-864.59; N=4), Pb 45.5 (16.33-74.66; N=11), Se 336.88 (107.49-566.27; N=7), U 6.12 (1.72-10.51; N=6), Zn* 31.31 mg/kg (22.54-40.08; N=18).

For products for young children (PYC, 1-3 years): Al 2052.61 µg/kg (173.67-3931.52; N=9), iAs 23.99 (10.82-37.17; N=11), Cd 6.44 (3.64-9.25; N=8), Co 0.90 (0.80-1.00; N=1), Cr 27.70 (16.39-39.01; N=1), Fe* 8.89 mg/kg (6.58-11.21; N=1), MeHg 0.14 (0-0.03; N=1), Mn 649.86 (0-1649.41; N=2), Ni 1358.2 (761.2-1955.21; N=7), Pb 16.9 (0-37.48; N=7), Se 20.00 (11.65-28.35; N=1), U 6.65 (4.19-9.11; N=6). PYC Cu and Zn were not reported in Table 2.

The text rank-order for IF was Fe>Zn>Cu>Mn>Al>Cr>Se>Ni>Pb>iAs>Co>MeHg>Cd>U. For FFI it was Fe>Zn>Cu>Mn>Al>Ni>Se>Cr>Pb>iAs>Co>U>Cd>MeHg. For PYC it was Fe>Al>Ni>Mn>Cr>iAs>Se>Pb>U>Cd>Co>MeHg.

Table 3 — pooled concentrations stratified by WHO region. Eastern Mediterranean Region (EMR) IF samples carried the highest concentrations of Al (4600 µg/kg, 95% CI 3889.87-5310.13; N=1 study), Cd (6.10), Co (55.40), Cr (588 µg/kg, CI 516.8-659.21; N=1), Ni (344 µg/kg, CI 169.54-518.46; N=1), and Zn (32.90 mg/kg). Region of the Americas (AMR) IF samples carried the highest Cu (2672.33 µg/kg, CI 1667.44-3677.22), Mn (1845.78 µg/kg, CI 832.66-2858.91), and U (8.36 µg/kg). European Region (EUR) IF samples carried the highest Pb (53.68 µg/kg, CI 0-124.26; N=4) and iAs (9.30 µg/kg, though the AMR value of 22.41 was actually higher — the text states “highest concentrations of Pb (53.68 µg kg⁻¹) and iAs (9.30 µg kg⁻¹) belonged to the European Region”; we record this as published).

For FFI, AMR samples carried the highest Al (838.25 µg/kg, CI 516.68-1159.82; N=4), iAs (21.25), Cd (4.92), Co (10), Cr (340.18), Cu (2127.23), Fe (52.94 mg/kg), Mn (1853.79 µg/kg, CI 935.79-2770.81), Se (462.5), and U (7.22). EUR FFI samples carried the highest MeHg (0.39, CI 0-1.06; N=2), Ni (406.35), and Pb (60.92 µg/kg, CI 0-135.97; N=4). African Region (AFR) FFI samples carried the highest Zn (45.43 mg/kg, CI 31.35-59.5; N=5).

For PYC, AMR samples carried the highest Al (1522.47 µg/kg) and iAs (40.03 µg/kg, CI 24.79-54.27; N=6); the EMR value of 7.4 µg/kg (CI 5.55-9.24; N=3) and the EUR value of 1.614 µg/kg (CI 0.5-2.73; N=2) were substantially lower. EUR PYC samples carried the highest Ni (550 µg/kg, CI 341.07-758.93; N=1), Cr (27.7), Se (20), Fe (8.9 mg/kg), Pb (6.96), Co (0.9), and MeHg (0.14). EMR PYC samples carried the highest Mn (1160 µg/kg) and Al (8690 µg/kg, CI 8169.47-9210.53; N=1).

Table 4 — non-carcinogenic risk (THQ) by formula type using EPA RfDo values. RfDo values used (mg/kg body weight/day): Al 1.0, iAs 0.0003, Cd 0.0001, Co 0.0003, Cr 1.5, Cu 0.04, Fe 0.7, MeHg 0.0001, Mn 0.14, Ni 0.011, Se 0.005, U 0.0002, Zn 0.3. THQ for Pb and Ti was not calculated because the EPA had not established RfDo values for these elements as of the publication. Average daily intake was assumed to be 780 mL/day for 0-3 months, 1,200 mL/day for 3-6 months, 500 mL/day for 6-12 months and 1-3 years. Reference body weights were 6.1 kg (0-6 months), 9.1 kg (6-12 months), and 12.1 kg (1-3 years). Powder per 100 kcal reference values used were IF 20.28 g/100 kcal, FFI 20.78 g/100 kcal, PYC 21.26 g/100 kcal. iAs THQ was calculated assuming total As represents inorganic As (a deliberately conservative worst-case interpretation, since most included studies measured total As rather than speciated As).

For IF the mean THQ values were Al 0.019, iAs 0.834, Cd 0.847, Co 0.79, Cr 0.003, Cu 0.965, Fe 1.004, MeHg 2.104, Mn 0.229, Ni 0.244, Se 0.741, U 0.327, Zn 1.835. Mean THQ values exceeding 1.0 (probable health risk): MeHg (2.104), Fe (1.004), Zn (1.835). At the worst-case (maximum value within the 95% CI): iAs (1.281), Cd (1.109), Co (1.083), Cu (1.23), Fe (1.233), MeHg (6.054), Zn (2.422) also exceeded 1.0.

For FFI the mean THQ values were Al 0.011, iAs 0.632, Cd 0.506, Co 0.397, Cr 0.003, Cu 0.733, Fe 0.969, MeHg 0.059, Mn 0.16, Ni 0.556, Se 1.014, U 0.461, Zn 1.571. Mean THQ values exceeding 1.0: Se (1.014), Zn (1.571). Maximum-value THQ exceeding 1.0: iAs (0.919 — just under), Cd (0.851), Cu (1.027), Fe (1.35), Ni (1.183), Se (1.705), Zn (2.011).

For PYC the mean THQ values were Al 0.013, iAs 0.496, Cd 0.399, Co 0.019, Cu — (nd), Fe 0.079, MeHg 0.009, Mn 0.029, Ni 0.765, Se 0.025, U 0.206. Maximum-value THQ exceeding 1.0 was Ni (1.102) alone.

Table 5 — Total Target Hazard Quotient (TTHQ) and per-country average THQ. TTHQ was calculated as the sum of individual THQs for the elements reported per country. For IF the country ranking by TTHQ was Jordan (12.839) > Brazil (10.423) > Turkey (8.02) > Spain (5.311) > Malta (4.423) > Italy (3.008) > Iran (1.019) > Kuwait (0.63) > France (0.305) > United States (0.025). For FFI: Brazil (8.834) > Malta (4.675) > Turkey (4.222) > Ethiopia (2.393) > Spain (1.513) > Saudi Arabia (0.422) > France (0.305) > Iran (0.107); Jordan, Italy, Kuwait, and the United States do not have FFI rows reported in Table 5. For PYC: Brazil (2.28) was the only country with TTHQ > 1; France (0.19), Italy (0.36), Saudi Arabia (0.049), and Spain (0.284) were below 1.

Per-country THQ > 1 for individual elements (IF): iAs in Turkey (2.938) and Brazil (1.532); Cd in Jordan (1.641) and Iran (1.019); Co in Jordan (3.787); Cu in Jordan (1.241), Brazil (1.37), and Malta (1.707); Fe in Jordan (1.91), Turkey (1.797), and Brazil (1.258); MeHg in Spain (3.15); Ni in Spain (1.171); Se in Brazil (1.413); Zn in Jordan (2.249), Brazil (2.073), Turkey (2.032), and Malta (1.862). For FFI: iAs in Brazil (1.066), Cu in Malta (1.268), Fe in Brazil (1.139), Ni in Malta (1.122), Se in Brazil (1.393), and Zn in Ethiopia (2.28), Turkey (1.738), Malta (1.656), and Brazil (1.435). For PYC: only Brazil’s TTHQ of 2.28 was driven by Ni (0.84), Cd (1.019), and iAs (0.827).

The risk-assessment narrative emphasizes that the iAs THQ values use the worst-case 100% inorganic-As assumption (most included studies measured total As without speciation), and that the actual inorganic-As fraction in dairy-derived foods is plausibly lower (perhaps 50%, though the precise fraction varies with raw material and reconstitution water). Average dietary inorganic-As fraction in the meta-analysis: IF=12.2 µg/kg and FFI=12.59 µg/kg were below the EU Commission Regulation cited maximum (20 µg/kg), while PYC=24 µg/kg was slightly above the cited 20 µg/kg limit. Average dietary Pb in IF (42.98 µg/kg) and FFI (45.5 µg/kg) substantially exceeded the EU 2015/1005 maximum level for infant and follow-on formula (20 µg/kg).

Risk of bias. 80% (24/30) of included studies were classified as high methodological quality on the JBI Critical Appraisal Checklist, 16.7% (5/30) as moderate, and 3.3% (1/30) as low. Confounding identification was rated “Yes” in only 30% of studies; confounding strategies “Yes” in 63.3%; objective measurement criteria “Yes” in 80%; statistical analysis appropriateness “Yes” in 76.7%.

Methods (brief)

Systematic review-with-meta-analysis following PRISMA 2020, protocol registered on Open Science Framework on 2022-06-14 (https://doi.org/10.17605/OSF.IO/2YNKB). Population-Exposure-Comparison-Outcome (PECO) question: “Do CMFs contain levels of potentially toxic elements that could harm children’s health?” Literature search across Embase, Scopus, PubMed, Web of Science, Livivo, and Lilacs conducted 2024-02-20 by two researchers; restricted to the seven years preceding the search (2017-2024); no language, publication-status, or country restriction. Reference lists of included studies were searched for additional eligible studies. Screening via Rayyan QCRI; two independent researchers screened titles/abstracts and then full texts.

Inclusion criteria: observational studies that investigated the concentration of essential and PTE in CMF, expressed as mass per mass (mg/kg or µg/kg), in IF, FFI, or PYC. Exclusion criteria: studies of non-fortified animal milk (cow, goat, buffalo, other), solid or fermented milk products (yogurt, cheese), studies focusing on PTE measurement methodology (validation, optimization, development), studies of dairy products obtained under abnormal conditions (e.g., environmental disasters), review studies, conference abstracts, personal opinions, books, case reports, research protocols, clinical trials, qualitative studies, in vivo (animal), and in vitro studies. Risk of bias by JBI Critical Appraisal Checklist for Analytical Cross-Sectional Studies.

Meta-analysis: random-effects model using Restricted Maximum Likelihood (REML) in STATA v16.0; pooled effect size = weighted mean difference (WMD) representing the level of elements weighted by sample size per study. Chi² test (p<0.1) for heterogeneity supplemented by I-square test; I² > 50% with visual forest-plot confirmation = substantial heterogeneity. Studies were stratified by CMF type (IF/FFI/PYC) and WHO region (AFR African, AMR Americas, EMR Eastern Mediterranean, EUR European, WPR Western Pacific). Concentrations expressed in mg/kg were converted to mg/100 kcal using powder-per-100-kcal reference values for comparison against international compositional standards.

Estimated daily intake (EDI) was calculated as EDI = (Cm × Cd) / bw, where Cm is the meta-analysis pooled concentration in mg/g powder, Cd is the recommended daily mass of powder to prepare one daily consumption following label recommendations (125.1 g/day at 0-6 months, 137 g/day at 0-12 months, 75 g/day at 1-3 years), and bw is body weight (6.1 kg at 0-6 months, 9.1 kg at 6-12 months, 12.1 kg at 1-3 years; WHO Growth Standards reference). EDI was compared against Institute of Medicine Dietary Reference Intakes for Cr, Cu, Fe, Mn, Se, and Zn (adequacy assessment) and against Tolerable Upper Intake Levels for Fe, Zn, and Se where UL had been established. Average formula intake was assumed at 780 mL/day for 0-3 months, 1,200 mL/day for 3-6 months, and 500 mL/day for FFI (6-12 months) and PYC (1-3 years).

Target Hazard Quotient (THQ) was calculated per EPA Risk Assessment Guidance for Superfund as THQ = EDI / RfDo, with RfDo values (mg/kg body weight/day): Al 1.0, iAs 0.0003, Cd 0.0001, Co 0.0003, Cr 1.5, Cu 0.04, Fe 0.7, MeHg 0.0001, Mn 0.14, Ni 0.011, Se 0.005, U 0.0002, Zn 0.3. THQ for Pb and Ti was not calculated because the EPA had not established RfDo values for these elements as of the publication; the authors note this gap explicitly. iAs THQ was calculated treating total As as if it were 100% inorganic As (deliberately conservative; the authors note that for dairy and infant-formula matrices the iAs fraction could be substantially lower). THQ > 1 indicates potential non-carcinogenic health risk. TTHQ (Total Target Hazard Quotient) was the sum of all individual element THQs per country; the same THQ < 1 / >1 interpretation applies. THQ minimum and maximum were also calculated from the 95% CI of the meta-analysis to capture heterogeneity-driven uncertainty.

Reported limitations. The TTHQ approach assumes additivity of element-specific hazards and may overestimate risk where antagonistic interactions attenuate combined effects; conversely, limited exposure data and incomplete reporting may also lead to underestimation. Aggregated country-level data do not capture intra-country regional variability. Average consumption rate assumptions were used rather than per-study measured intakes. The use of total As as a proxy for inorganic As is conservative. Reference-dose values for Pb and Ti are not yet established by competent regulatory bodies, so these elements were not included in THQ calculations.

Implications

Certification: Highest-tier secondary-synthesis source for HMTc infant-formula-powder, follow-on-formula-powder, and toddler-milk (PYC) rows. The Largueza et al. meta-analysis quantifies the global infant-formula evidence base for Al, iAs, Cd, Co, Cr, Cu, Fe, MeHg, Mn, Ni, Pb, Se, U, and Zn across IF (n=23 studies feeding meta-analysis where available), FFI (n=22), and PYC (n=9) on the as-placed-on-market powder basis. The pooled WMD values and 95% CI bounds are appropriate for synthesis citation in benchmark-setting workups, but the primary individual studies (Almeida 2022, de Almeida 2022, Souza 2023, Alharbi 2023, Boon 2022, Maruszewska 2021, Astolfi 2021, Tahboub 2021, Mandiá 2021, Mohamed 2021, Frisbie 2019, Scher 2021/2024, Dobrzyńska 2021, Eticha 2018, Jallad 2018, Martínez 2018, Ünüvar 2017, Chekri 2019, Vella 2019, Igweze 2019, Saeed 2021, Ibrahim 2020, Elsheikh 2020, Marquès 2021, Da Silva 2018, Dehcheshmeh 2021, Melo 2024, Sant’Ana 2021, Fioravanti 2020, Başaran 2021) supply the sample-level occurrence data for benchmark-pool admission. Mean-level TTHQ > 1 documented for Brazilian and Jordanian IF, FFI, and PYC products, and the mean Pb concentration in IF and FFI exceeding the EU 2015/1005 maximum, are relevant signals for HMTc certification-threshold defensibility narrative around milk-based formula categories.

Courses: This is a strong recent example of a PRISMA-registered systematic review with random-effects REML meta-analysis applied to the infant-feeding toxicology question, including a worked THQ/TTHQ exposure-translation step. The country-level TTHQ ranking provides a teaching example of how regional analytical heterogeneity (different element panels measured across studies) makes cross-country risk comparison rest on common-denominator assumptions about which RfDo values are available. The Pb exclusion from THQ — driven by EPA’s withdrawal of an RfDo for lead — is a teaching example of how regulatory framework gaps interact with literature-based exposure modeling.

App: Supports per-serving exposure estimates for milk-formula-fed infants 0-6 months, 6-12 months, and toddlers 1-3 years across 13 metals on the as-placed-on-market powder basis. The estimated daily intake formulas (EDI = Cm × Cd / bw) with the body-weight and daily-consumption assumptions documented here are directly usable for app-level estimates after applying the appropriate reconstitution factor for liquid-as-fed exposures. The TTHQ country tables enable origin-aware risk weighting.

Wiki pages this source may touch

• infant-formula-powder
• infant-formula-powder-non-soy
• infant-formula-powder-soy-based
• non-soy-infant-formula
• soy-based-infant-formula
• aluminum
• arsenic-inorganic
• arsenic-total
• cadmium
• cobalt
• chromium
• copper
• iron
• lead
• manganese
• mercury-methyl
• nickel
• uranium
• zinc
• eu-2023-915-lead-infant-young-child-foods
• eu2023-contaminants-maximum-levels
• epa-iris-cadmium-rfd
• epa-iris-mercury-rfd
• epa-iris-methylmercury-rfd
• efsa-nickel-tdi

Verification notes

Title, authors, journal, DOI, and publication metadata taken from the Springer PDF title page; received 2026-01-09, accepted 2026-03-27, published online 2026-04-09. The article is Open Access under Creative Commons Attribution 4.0; the funding declaration credits APC support from CAPES Brazil (Finance Code 001). Cite-key year 2026 matches the publication metadata.

Metals frontmatter records both iAs and tAs because the paper measures total As across most included studies but reports THQ on the conservative assumption that total As = 100% inorganic As; the paper acknowledges this is a worst-case treatment for dairy and infant-formula matrices and that the actual inorganic-As fraction may be substantially lower. Mercury is recorded as MeHg because the paper specifies methylmercury (RfDo 0.0001 mg/kg/day for MeHg, matching EPA IRIS for methylmercury). Total Hg (tHg) is not added to the metals list because the meta-analysis pool reports MeHg only; total mercury was not pooled.

The paper does not distinguish soy-based versus cow-milk-based formulas in the pooled results — it includes both under the umbrella term “commercial milk formula” per the 2023 Codex Alimentarius classification. Per the CLAUDE.md routing rule, the matrices: array records the broad form-of-product (infant-formula, follow-on-formula, products-for-young-children, as-placed-on-market) and the routing layer fans these out to the soy and non-soy sibling product pages.

Selenium (Se) is reported in Tables 2 and 3 and in the THQ analysis but is not added to the metals: frontmatter array because the wiki metals/ directory does not maintain a selenium page (Se is an essential element falling outside the heavy-metals scope of the HMI taxonomy). Se findings remain captured in the body Key Numbers section.

Brand identification is not provided in this systematic review — the paper aggregates pooled-WMD values across studies without naming individual brands — so the brand firewall (CLAUDE.md Part 12) is automatically satisfied. Country and WHO-region attribution is retained because country-level TTHQ values are the principal regulatory and HMTc-defense signal in this paper.

The PYC sample-size column in Table 2 lists single-study pools (N=1) for several elements (Cu, Cr, MeHg, Fe, Se), reflecting that the PYC category is undersampled in the included literature; the PYC pooled values should be treated as preliminary and the Discussion explicitly states “data should be considered with caution when evaluating TTHQ by country, since there was only one study that reported concentrations of these elements in PYC samples for Brazil.” This caveat is preserved in the Key Numbers narrative.

The PYC MeHg pooled value in Table 2 prints as “0.14 (0-0.03)” with a confidence interval that appears reversed in the published table; the Discussion text and Table 4 use 0.009 µg/kg as the PYC MeHg mean for THQ calculation. This page records the table value as printed and notes the typographic anomaly here for downstream readers. The THQ calculation in Table 4 uses 0.009 µg/kg consistent with a value below the table-printed mean.

Audit subagent (2026-06-09) flagged the AMR PYC iAs as 7.4 µg/kg; verified against PDF p. 12 Table 3 — corrected to 40.03 µg/kg (the 7.4 value is the EMR PYC iAs). Auditor flagged the IF per-country THQ for iAs swapping Brazil and Turkey values; verified against PDF p. 14 Table 5 — corrected to Turkey (2.938) and Brazil (1.532), removing the in-text caveat that was masking the swap. Auditor flagged the AMR FFI Mn as 1853.3 µg/kg; verified against Table 3 — corrected to 1853.79 µg/kg with CI 935.79-2770.81. Auditor flagged AMR FFI Cr silently rounded to 340.2; verified against Table 3 — corrected to 340.18. Auditor flagged the FFI TTHQ phrase “Jordan, Italy, Kuwait below 1”; verified against Table 5 — corrected to note that these countries (plus the United States) have no FFI rows reported in Table 5. Auditor flagged inclusion of infant-formula-rtf-liquid-non-soy and infant-formula-rtf-liquid-soy-based in products:; verified against PDF p. 4-5 (eligibility and Equation 2) — the paper’s meta-analysis pool is on the powder-as-placed-on-market basis (Cm in mg/g of formula powder, powder per 100 kcal reference values), so RTF-liquid product slugs were removed from both frontmatter and the wiki-pages section. Auditor flagged the regulation slug eu-2015-1006-iAs-rice; verified against the snapshot — that slug is for rice iAs and was incorrectly chosen; replaced with eu-2023-915-lead-infant-young-child-foods, which is the current EU regulation covering the Pb limits the paper compares against (the paper cites EU Regulation 2015/1005 [ref 65] as the Pb amendment to EC 1881/2006, both superseded by EU 2023/915). Auditor flagged “RNAA” in the methods list; verified against Table 1 footnote (which defines RNAA but no included study used it) — removed RNAA and simplified the residual-method list to match Table 1.

Audit subagent flagged inclusion of both iAs and tAs in the metals array; verified false positive: the paper labels its Table 2/3/4/5 values and THQ calculations as iAs throughout while acknowledging that most underlying studies measured total As. Listing both is the honest reading — the analyte measured is tAs, the analyte reported and risk-modeled is iAs; the Verification notes already explain the speciation reality. Auditor flagged the EUR-vs-AMR IF iAs editorial parenthetical as wiki-side commentary; verified false positive — the paragraph documents a genuine internal contradiction in the source (PDF p. 13 text claims EUR has the highest IF iAs at 9.30 µg/kg, but Table 3 shows AMR IF iAs at 22.41), and transparent flagging of source-internal contradictions is appropriate per CLAUDE.md Part 14 (uncertainty discipline). Auditor flagged the “defensibility narrative” phrasing in Implications as approaching the Part 2 firewall; verified false positive — the phrasing identifies the source’s utility for HMTc work without proposing a threshold value or softening the literature reading.

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