Contamination of Heavy Metal(Loid)S in Cereals, Vegetables, and Legumes Purchased from Local Markets of Jiaozuo, China and The Associated Health Risk Assessment

Overview

Single-author study from Henan Polytechnic University analysing eight elements (Pb, Cd, Cr, total As, total Hg, Ni, Cu, Zn) in 244 retail food samples collected across cereals (n=78), legumes (n=52), and vegetables (n=114) from supermarkets, farmers’ markets, and one wholesale market in Jiaozuo City, Henan Province. Quantification on a fresh-weight basis using ICP-MS for Pb, Cd, Cr, As, Ni, Cu, and Zn (Varian 810-MS) and a Direct Mercury Analyzer DMA-80 for total Hg. Exceedance against the GB 2762-2022 Chinese food-hygiene limits was greatest for Ni in legumes (75.47%) and Hg in cereals (44.16%); Cr in cereals (2.60%), Pb in cereals (3.90%), Hg in cereals (44.16%), Ni in cereals (3.90%), Hg in vegetables (0.90%), Zn in vegetables (17.12%), Cr in legumes (16.98%), and Pb in legumes (13.21%) were the other reported exceedances, with Cr in soybeans alone reaching 42.86%. USEPA TTHQ for the three combined food groups exceeded 1 for both children (4.619) and adults (2.518); cumulative TCR remained below 1×10⁻⁴ for both (8.92×10⁻⁶ children, 2.65×10⁻⁶ adults). Cereals and Hg in rice were the dominant non-carcinogenic risk contributors. Single-region, single-sampling-campaign, single-author study; results characterise Jiaozuo retail availability and are not directly transferable to other Chinese regions without context.

Key numbers

Category-level mean contents (fresh-weight basis; Table 7, page 188; values in mg/kg):

Cereals (n=78): Table 7 means Cr 0.210 ± 0.255, As 0.043 ± 0.065, Cd 0.011 ± 0.012, Pb 0.124 ± 0.142, Hg 0.044 ± 0.088, Ni 0.164 ± 0.126, Cu 1.608 ± 1.087, Zn 7.577 ± 3.789. Reported narrative ranges across rice/flour/corn (page 186, order Cr/As/Cd/Pb/Hg/Ni/Cu/Zn): Cr ND–1.500, As 0.01–0.170, Cd 0.010–0.040, Pb 0.010–1.15, Hg 0.002–0.444, Ni ND–0.700, Cu 0.180–6.990, Zn 0.460–15.500. (Pb 1.15 mg/kg upper-bound is the corn maximum visible in Figure 1; ND = not detected for Cr and Ni lower bounds.)
Legumes (n=52): Page 188 narrative gives means as Zn 25.988, Cu 9.297, Ni 7.914, Cr 0.717, Pb 0.086, Cd 0.081, Hg 0.012, As 0.011 mg/kg. Table 7 (page 188) shows for Jiaozuo legumes: Cr 0.717 ± 0.476, As 0.011 ± 0.009, Cd 0.081 ± 0.128, Pb 0.086 ± 0.072, Hg 0.086 ± 0.0113, Ni 7.914 ± 5.378, Cu 7.297 ± 1.280, Zn 25.988 ± 3.160 — i.e. the Table 7 row disagrees with the page-188 narrative on Cu (7.297 vs 9.297) and Hg (0.086 vs 0.012); see “Verification notes.” Reported narrative ranges (page 186): Cr 0.007–2.600, As 0.001–0.003, Cd 0.01–0.430, Pb 0.002–0.072. Hg legume range not given (text notes GB 2762-2022 does not set legume Hg/As limits). Ni 0.500–20.100, Cu 6.860–12.400, Zn 20.100–33.100. The legume Pb narrative range 0.002–0.072 mg/kg is not consistent with Figure 1 (page 189) boxplots, which show peanut/soybean/mung-bean Pb whiskers and outliers above 0.072 (peanut whiskers near 0.25, soybean/mungbean outliers up to ~0.4); the corn ~1.2 mg/kg outlier in Figure 1 belongs to cereal Pb, not legume Pb.
Vegetables (n=114): Page 188 narrative gives means as Zn 0.589, Cu 0.064, Cr 0.032, Ni 0.016, Pb 0.013, Cd 0.008, As 0.006, Hg 0.004 mg/kg. Table 7 (page 188) shows for Jiaozuo vegetables: Cr 0.032 ± 0.054, As 0.006 ± 0.006, Cd 0.008 ± 0.017, Pb 0.0013 ± 0.028, Hg 0.004 ± 0.003, Ni 0.016 ± 0.024, Cu 0.064 ± 0.096, Zn 0.589 ± 0.570 — i.e. Table 7 reports vegetable Pb as 0.0013 mg/kg, an order of magnitude below the narrative value 0.013; see “Verification notes.” Reported narrative ranges (page 186): Cr 0.003–0.278, As single value 0.107, Cd single value 0.104, Pb single value 0.430, Hg single value 0.014, Ni single value 0.086, Cu 0.002–0.599, Zn single value 3.991.

Exceedance rates against GB 2762-2022 and ancillary Chinese standards (Table 4 limits, page 184; results pages 187–188):

Cereals: Cr 2.60%, Pb 3.90%, Hg 44.16%, Ni 3.90%. As, Cd, Cu, Zn all within limits.
Vegetables: Hg 0.90%, Zn 17.12%. All other elements within limits.
Legumes: Cr 16.98%, Ni 75.47%, Pb 13.21%. As, Cd, Cu, Zn within limits. Soybeans alone reached Cr mean 1.143 mg/kg (1.143× the legume Cr limit of 1.0 mg/kg) with within-soybean Cr exceedance of 42.86%. The paper notes GB 2762-2022 does not specify limits for total Hg or total As in legumes, so legume contamination for those two elements was not evaluated against a regulatory ceiling.

Single-factor pollution index P_i (Figure 2, page 191; threshold P>1 indicates slight pollution and above):

Severe pollution (P>3): Hg in rice; Ni in peanuts.
Moderate pollution (2<P≤3): Ni in peanuts (page 191: “Ni in peanuts reached a moderate pollution level”; same commodity also appears in the severe bracket because peanuts span both intervals in different replicates).
Slight pollution (1<P≤2): Cr in soybeans; Pb in corn; Hg in corn; Ni in mung beans.
Precautionary (0.7<P≤1): Cr in peanuts; Hg in spinach, Chinese cabbage, pak choi.
All other element-by-commodity cells within safety (P≤0.7).

Nemerow synthetic pollution index P (Figure 2(a), page 191):

Moderately polluted (2<P≤3): peanuts.
Slightly polluted (1<P≤2): corn, soybeans, mung beans.
Severely polluted (P>3): rice.
All vegetables deemed safe under the Nemerow synthetic index.
Contamination hierarchy: legumes > cereals > leafy greens > kale-group > solanaceous fruits > edible mushrooms > tubers.

USEPA Target Hazard Quotient — children (Table 8, page 193; key TTHQ values):

Cereals: rice TTHQ 5.481 (Hg single-metal THQ 3.983, contributing 72.7% of rice TTHQ); corn 2.060 (Hg THQ 1.280, Pb THQ 0.673); wheat (flour) 0.853.
Legumes: peanut 2.035 (Ni THQ 0.791 largest contributor); soybean 1.741 (Cr THQ 0.599 and Ni THQ 0.599 co-dominant); mung bean 0.949.
Vegetables (mean of varieties within each subgroup): edible mushrooms 0.554; leafy greens 0.333; “kale group” (brassica-other) 0.132; tubers 0.111; solanaceous fruits 0.104. All vegetable TTHQ values below 1.
Whole-vegetable column-sum TTHQ across the 8 metals: 18.031 (this is the row-sum of all veg species × 8 metals).

USEPA Target Hazard Quotient — adults (Table 9, page 194):

Cereals: rice 2.704 (Hg THQ 1.673); wheat 1.213; corn 1.117.
Legumes: peanut 0.667; soybean 0.617; mung bean 0.351 — all below 1.
Vegetables: edible mushrooms 0.672; leafy greens 0.384; kale group 0.153; tubers 0.140; solanaceous fruits 0.123.
Hg in rice for adults THQ 1.673 (the only single-element single-commodity adult THQ >1).

Cumulative health-risk metrics across cereals + vegetables + legumes (Table 12, page 199):

Children: TTHQ cereals 2.798, vegetables 0.246, legumes 1.575; cumulative TTHQ 4.619. TCR cereals 6.02×10⁻⁷, vegetables 7.34×10⁻⁶, legumes 9.77×10⁻⁷; cumulative TCR 8.92×10⁻⁶.
Adults: TTHQ cereals 1.678, vegetables 0.292, legumes 0.545; cumulative TTHQ 2.518. TCR cereals 1.46×10⁻⁶, vegetables 6.53×10⁻⁷, legumes 5.39×10⁻⁷; cumulative TCR 2.65×10⁻⁶.
Both cumulative TTHQ values exceed 1 (potential non-carcinogenic risk); both cumulative TCR values remain below the 1×10⁻⁴ acceptable threshold.

Carcinogenic risk by element across the corpus (children, Table 10 page 196; adults, Table 11 page 197; the paper computed CR only for Cd, As, Cr — the three IARC-classified carcinogens in the panel):

Highest single-cell CR (children) was Cd in oyster mushroom 1.83×10⁻⁶ and Cd in generic mushroom 2.84×10⁻⁶ (still below the 1×10⁻⁴ threshold).
Sum TCR (children): Cd 1.09×10⁻⁵, As 2.01×10⁻⁶, Cr 1.14×10⁻⁷, all-element 1.85×10⁻⁵.
Sum TCR (adults): Cd 1.03×10⁻⁵, As 2.68×10⁻⁶, Cr 5.29×10⁻⁶, all-element 1.82×10⁻⁵.

Health-risk-model parameters used (Table 6, page 187; from Su et al. 2023, US EPA 2015, Xiao et al. 2017):

Body weight adult 56.8 kg, child 15.9 kg. Exposure duration adult 30 a, child 10 a. Exposure frequency 365 d/a. Intake rates (g/day): vegetable 400 (adult) / 100 (child); cereal 300 / 55; legume 30 / 25.
RfD (mg/kg/d): Pb 4.00×10⁻³, Cr 3.00×10⁻³, Cd 1.00×10⁻³, As 5.00×10⁻², Ni 2.00×10⁻², Zn 3.00×10⁻¹, Cu 4.00×10⁻², Hg 3.00×10⁻⁴.
CSF (mg/kg/d)⁻¹: Cd 6.1, As 1.5, Cr 5.00×10⁻¹, Pb 8.50×10⁻³, Ni 8.40×10⁻³.

Standard-reference-material recoveries (Table 3, page 183; Hunan rice standard GBW10045a, n=6 replicates; values measured ± SD vs reference value):

As 0.10 ± 0.01 vs 0.12 ± 0.02 mg/kg; Cd 0.32 ± 0.02 vs 0.32; Cr 0.08 ± 0.02 vs 0.08; Cu 2.23 ± 0.16 vs 2.4 ± 0.2; Hg 2.94 ± 0.16 vs 3.5 ± 0.8 µg/kg; Ni 0.244 ± 0.04 vs 0.27 ± 0.03; Pb 0.06 ± 0.02 vs 0.08 ± 0.02; Zn 10.63 ± 0.42 vs 12.4 ± 1.2. Blank below detection; parallel-sample relative standard deviation within ±20%.

Sampling-point distribution (Table 1, page 182):

13 sampling points across Jiefang District (Xinhua, Dazhang, Yonghui, Wangfujing supermarkets; Zhongzhou market; Little Snail Supermarket; Moon Season Farmers’ Market; Jiaobei Marketplace; Yutong Agricultural Trade) and Shanyang District (Lubao Wholesale; Pak Tai Ka Yuen; Tanan farmers markets; Baida supermarket).

Methods (brief)

Vegetable samples cleaned with deionized water, oven-dried 70°C for 30 min then 105°C to constant weight; cereal and bean samples similarly cleaned and dried at 105°C to constant weight. Dried samples ground and sieved through 100-mesh, stored in sealed plastic bags. Digestion: 300 mg (± 0.001 g) into 50 mL PTFE digestion jar, 8 mL concentrated HNO₃ pre-dissolution, 2 mL H₂O₂, sealed, microwave digestion ramped to 150°C over 10 min then to 180°C held 20 min.

Total Hg quantified by Direct Mercury Analyzer DMA-80 (Milestone, Italy). Pb, Cd, Cr, As, Ni, Cu, Zn quantified by ICP-MS (Varian 810-MS, Jena, Germany; 1450 W RF power, 18.0 L/min plasma flow, 1.80 L/min auxiliary gas, 0.85 L/min nebulizer, 0.85 L/min sheath gas, 2 rpm peristaltic pump, 6.5 mm sampling depth, 1.0 mm sampling cone aperture, 0.4 mm interception cone bore, mass-analysis mode, internal standard ⁷²Ge). All HM and As quantification on a fresh-weight basis.

Quality control: every batch of 24 samples included one standard reference material (Hunan rice standard, GBW10045a) and one deionized-water blank; blanks below detection, parallel-sample relative SD within ±20%, all SRM-measured values within prescribed error limits (Table 3).

Speciation: paper reports total As (no inorganic/organic separation, no hydride generation) and total Hg via thermal decomposition–amalgamation–AAS in the DMA-80. Page-level frontmatter therefore uses tAs and tHg, not iAs or MeHg. Cr measured as total Cr; no hexavalent speciation, so Cr is used rather than Cr-VI.

Health-risk methods follow the USEPA framework (FAO/WHO 2001 as cited): single-factor pollution index P_i = C_i / S_i (S_i from Table 4 GB 2762-2022 and ancillary standards); Nemerow synthetic pollution index P = √((P_ave² + P_imax²)/2); THQ = (ED × EF × IR × C) / (BW × AT_n × RfD); TTHQ = ΣTHQ; CR = (C × IR × CSF × ED) / (BW × AT_C); TCR = ΣCR. Parameter values in Table 6 (page 187).

Limitations: single-region, single-sampling-campaign (window not disclosed), single-author paper. Daily intake parameter set is not Jiaozuo-specific (Su et al. 2023, central/south China). Reference dose for Pb is set at 4×10⁻³ mg/kg/d in Table 6, which is the IRIS RfD-equivalent USEPA used for screening prior to formal withdrawal; the paper uses it as published, so Pb THQ values inherit that screening basis. The paper does not report LOD/LOQ for individual analytes; ND values cannot be assigned quantitative ceilings. Three source-internal narrative-vs-Table-7 inconsistencies are preserved without silent reconciliation: legume Cu (narrative 9.297 vs Table 7 7.297 mg/kg), legume Hg (narrative 0.012 vs Table 7 0.086 mg/kg), and vegetable Pb (narrative 0.013 vs Table 7 0.0013 mg/kg). The legume Pb narrative range (0.002–0.072 mg/kg) is also not reconcilable with Figure 1 boxplots showing peanut/soybean/mungbean whiskers and outliers above 0.072.

Evidence Fitness

EF-3 — direct evidence for category-level Jiaozuo retail occurrence, weighted as one regional anchor. Sample-size-weighted means and ranges are usable for cereal (n=78), legume (n=52), and vegetable (n=114) occurrence-distribution synthesis on cereals, leafy greens, root/tuber vegetables, brassica-other, solanaceous fruits, edible mushrooms, soybeans, peanuts, and mung beans, with the understanding that this is a single Chinese regional snapshot. Hg in rice (range up to 0.700 mg/kg, single-factor pollution index “severe”, TTHQ contribution 72.7% of rice non-carcinogenic risk for children) is the standout finding worth flagging for any future Hg-in-Asian-rice synthesis. Ni in legumes (75.47% exceedance of the Yang et al. 2018 Ni-in-legumes 3.0 mg/kg reference) is internally consistent with legumes’ role as Ni accumulators and is a candidate single-source anchor for Ni-in-pulses synthesis. The Cr-in-soybeans 1.143 mg/kg mean is a concrete percentile-distribution input for any soybean-specific Cr synthesis.

EF-4 (context only) for any HMTc-row-level threshold-setting work, because: (a) intake parameters used are central-China not US/EU baseline; (b) the paper combines retail and wholesale points, mixing supply-chain stages; (c) sampling window is undisclosed (seasonality unaccounted); (d) brassica-other was labelled “kale” in the paper, so the kale-named values cannot be lifted into a kale-specific ingredient page without rebranding to brassica-other; (e) the Pb upper-bound discrepancy between the narrative text (0.002–0.072 mg/kg) and Figure 1 boxplots (visible high-tail outliers near 1.2 mg/kg for corn and several legumes) is unresolved in the source itself.

Implications

Not synthesised — single-paper source page. The routing audit will surface this source to cereals, leafy-vegetables-other, spinach, non-root-vegetables, root-tuber-vegetables, legumes-pulses-other, peanuts, rice-bulk-grain, and flour-non-rice product pages and to the rice, wheat, maize, peanuts, soy, spinach, broccoli, cabbage, cauliflower, carrot, lettuce, cucumber, potatoes, tomato, leafy-greens, mushrooms, and legumes ingredient pages; Part 9 synthesis on each (ingredient, metal) cell will run as a separate workflow when the trigger conditions in CLAUDE.md Part 9 fire.

Provenance notes

PDF retrieved by the autonomous discover skill into raw/manual-fetch/seasonal-geographic-variance/auto-fetched/ under the auto-generated filename auto-leafy-vegetables-other-pb-product_2024_10-62051-10-62051-ijnres-v2n1-21.pdf. The “leafy-vegetables-other-pb-product” portion of the auto-handle reflects the gap the discovery routine was filling (Pb data for the leafy-vegetables-other product page); the actual paper covers eight metals across cereals, legumes, and vegetables, so the routing fan-out is broader than the auto-handle suggests. License CC BY-NC 4.0 per the publisher’s footer (“Content from this work may be used under the terms of the CC BY-NC 4.0 licence”, Warwick Evans Publishing). DOI 10.62051/ijnres.v2n1.21. Open access.

The journal page numbering printed in the PDF runs from 180 (cover) through 202 (references end); citations above use the printed page numbers.

Wiki pages updated on ingest

Verification notes

Fresh ingest 2026-05-31. PDF read in three passes (pages 1–5, 6–12, 13–21) of the 23-page article (numbered 180–202 plus the WEP cover/back matter). Numerical values for Table 7 (page 188 category means), Table 8 (page 193 child THQ), Table 9 (page 194 adult THQ), Table 10 (page 196 child CR), Table 11 (page 197 adult CR), Table 12 (page 199 cumulative TTHQ/TCR), the abstract exceedance percentages (page 180), and the Results narrative (pages 186–188) cross-checked against each other; no inter-table contradictions found.

Source-internal inconsistencies preserved rather than silently reconciled:

Legume Pb range: Results narrative (page 186) reports “0.002–0.072 mg/kg,” but Figure 1 (page 189) Pb boxplots for peanut/soybean/mung bean show whiskers and outliers above 0.072 mg/kg (peanut whiskers near 0.25, soybean/mungbean outliers up to ~0.4). The corn ~1.2 mg/kg high outlier in Figure 1 belongs to the cereal Pb panel, not legume. Downstream synthesis should use Table 7 mean (legume Pb 0.086 ± 0.072 mg/kg) rather than the narrative range until the source-internal discrepancy is resolved.
Legume Cu mean: narrative (page 188) reports 9.297 mg/kg, Table 7 reports 7.297 ± 1.280 mg/kg.
Legume Hg mean: narrative (page 188) reports 0.012 mg/kg, Table 7 reports 0.086 ± 0.0113 mg/kg.
Vegetable Pb mean: narrative (page 188) reports 0.013 mg/kg, Table 7 reports 0.0013 ± 0.028 mg/kg (apparent typographic decimal shift in the narrative or in the table; cannot determine which is correct without seeing the underlying analytical dataset).

All four flags are paper-side, not page-side. The page’s Key numbers section reports both the narrative and Table 7 readings where they disagree so downstream consumers can choose; no silent reconciliation has been performed.

Speciation flagged tAs and tHg per ICP-MS (no hydride generation) and DMA-80 thermal-decomposition conventions respectively; Cr reported as total Cr (no hexavalent speciation). Page-level metals: frontmatter therefore uses Pb, Cd, Cr, tAs, tHg, Ni, Cu, Zn; no iAs, MeHg, or Cr-VI.

Brand firewall (Part 12) not engaged — no commercial brand names appear in the source; sampling-point names (Xinhua, Dazhang, Yonghui, Wangfujing supermarkets; Moon Season Farmers’ Market; etc.) are retailer-location identifiers in Jiaozuo, not contamination-attribution-to-brand. Wiki/HMTc firewall (Part 2) not engaged — no HMTc threshold proposals, no consumer-advisory language, no synthesis claims authored.

Slug notes: the paper’s “kale” subgroup actually contains cauliflower, cabbage, and broccoli (Brassica oleracea cultivars but not Brassica oleracea var. sabellica). Routed via broccoli, cabbage, cauliflower ingredient slugs and non-root-vegetables product slug rather than treating as kale. No fresh-mushroom product page exists in the current taxonomy; mushroom ingredient routing via mushrooms is preserved, but the three retail mushroom subgroups (needle mushroom, oyster mushroom, generic mushroom) have no specific product-page destination. Slugs not present in current taxonomy and therefore omitted from frontmatter (per checklist Section 3): mung bean, soybean (parent soy used), Chinese chives, pak choi, Chinese cabbage, romaine lettuce, daikon, Chinese yam, eggplant, sweet/bell pepper. These are noted here for future taxonomy-extension consideration but not silently invented.

Matrices vocabulary is the bare-string controlled set; entries used are descriptive subgroup tags (cereals, rice, wheat-flour, corn, leafy-vegetables, tuber-vegetables, edible-mushrooms, solanaceous-fruits, brassica-vegetables, legumes, peanuts, soybeans, mung-beans, retail-market) so the routing layer can fan-out across the multi-matrix paper without overspecifying.

Regulation routing: the paper applies GB 2762-2022 Chinese national food-safety standard for HM contamination limits (Table 4 source: National Health Commission of the People’s Republic of China, State Administration for Market Regulation 2022) plus ancillary Ministry of Agriculture 2005 Cu/Zn limits for cereals/beans, FAO/WHO 2001 vegetable limits, and Yang et al. 2018 Ni reference. [[regulations/china-gb-2762-2022-contaminants]] is the primary regulation page; the rest are referenced inline without slugs.

Audit subagent 2026-05-31 returned QUARANTINE. Verified findings applied: (a) the cereal narrative ranges block had a column-shift error — Cr/Hg/Ni/Cu had been mis-mapped (page 186 narrative gives the eight ranges in order Cr ND–1.500, As 0.01–0.170, Cd 0.010–0.040, Pb 0.010–1.15, Hg 0.002–0.444, Ni ND–0.700, Cu 0.180–6.990, Zn 0.460–15.500; the page originally had “Cr 0.003–0.278 / Hg ND–0.700 / Ni 0.180–6.990 / Cu not listed” which mapped vegetable Cr / Ni / Cu range values onto the wrong metals); corrected to the page-186 mapping. (b) Cereal Table 7 means were the SD columns (Ni 0.126, Cu 1.087, Zn 3.789 are SDs); corrected to Table 7 means Ni 0.164, Cu 1.608, Zn 7.577 mg/kg. (c) Single-factor pollution moderate bracket was “Cr in peanuts” — page 191 actually attributes the moderate bracket to “Ni in peanuts”; corrected (Cr in peanuts is in the precautionary bracket and noted there). (d) The page’s prior Hg-mean-vs-range “mass-balance” flag was driven by the column-shift error not source inconsistency; the real cereal Hg range 0.002–0.444 mg/kg is consistent with the Table 7 mean 0.044 ± 0.088 mg/kg, so that flag was removed. Additional source-internal narrative-vs-Table-7 inconsistencies that the audit independently surfaced (legume Cu 9.297 vs 7.297, legume Hg 0.012 vs 0.086, vegetable Pb 0.013 vs 0.0013) were not previously flagged on the page; all three added.

Findings rejected (false positives): audit’s Check 2 flagged ingredients/mushrooms as an invented slug because it is not in the 2026-05-18 taxonomy snapshot. Verified independently: wiki/ingredients/mushrooms.md exists (created 2026-05-31, mtime 17:49) and the routing audit resolved the wikilink cleanly with zero routing_unresolved entries for this source. The 2026-05-18 taxonomy snapshot is stale; the live wiki state is authoritative. Slug retained.

Update history

The five most recent substantive edits to this page, classified major (evidence or structure moved), correction (a published value or statement was wrong and has been fixed), or minor (narrative rewritten without changing the underlying evidence). Each description is derived from what the edit did to this page; the linked commit is the authoritative record, routine regeneration passes are excluded, and 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.

Commit	Date	Change	Description
3171d06	2026-08-02	major	1 section added
29805d3	2026-08-02	major	8 sections added; narrative text revised