Zhou et al. 2000 - Chinese vegetable heavy-metal review

Zhou et al. review heavy-metal contamination in vegetables in China and reproduce tabulated values from ten city-level studies published before 2000. The paper is not a primary sampling study, but its tables preserve historical food-occurrence values in mg/kg for vegetables and a small number of grain commodities. Arsenic, mercury, and chromium are not speciated in the food tables, so this page records them as tAs, tHg, and total Cr.

Key numbers

All occurrence values below are secondary review-table values in mg/kg. The paper’s Table 1 also lists Chinese food tolerance limits, but those are source comparators only and are not HMTc thresholds.

Table 2 reports Beijing vegetable lead averages from 1988-1989:

Table 3 reports Tianjin vegetable contamination from 1992-1993; each metal row lists 10 samples, 100% detection, and the following values:

Table 4 reports Changchun 1993 values for uprooted vegetables under agricultural film and uncovered cultivation. Product values are:

Table 5 reports Shenyang 1992-1993 averages and exceedance percentages for grains and vegetables:

Table 6 reports Xian vegetables from 1992-1993, comparing well-water and sewage irrigation across 12 commodities (72 total samples). The printed table shows sewage-irrigated values above well-water values for most metals; examples include tomato Cd 0.005 vs 0.008, cauliflower Pb 0.029 vs 0.048, celery Cu 0.98 vs 1.32, kidney bean Zn 1.82 vs 2.46, and Chinese cabbage Cr 0.67 vs 0.102 as printed in the extracted table.

Table 8 reports Ningbo 1995 ranges, averages, and exceedance percentages across 109 vegetable samples:

Table 9 reports Hefei lead contamination from 1988-1989. The highest average Pb values were water spinach leaf 2.03 mg/kg, amaranthas tricolor 1.92 mg/kg, spinach 1.71 mg/kg, bokchoy 1.61 mg/kg, and greengrocery 1.58 mg/kg; the lowest averages were compeer 0.43 mg/kg, kidney bean 0.45 mg/kg, horsebean 0.56 mg/kg, pepper 0.60 mg/kg, carrot 0.61 mg/kg, and towel gourd 0.68 mg/kg.

Table 10 reports Chengdu 1989-1990 averages for five commodities, with 16 samples for each commodity:

Table 11 reports Fuzhou 1995 vegetable values from 30 total samples:

Methods (brief)

This is a narrative review with reproduced data tables, not a new laboratory survey. The paper says the analytical methods used in the reported data were the Chinese National Standards Analytical Methods, described as identical with WHO/FAO recommended methods, but the review does not print the original sampling protocols, digestion methods, instruments, or QA/QC for each cited city study. The review discusses contamination pathways, including sewage irrigation, industrial wastewater, agricultural films, sludge and domestic garbage on farms, traffic emissions, and soil-to-vegetable uptake.

Implications

The source is useful as historical China vegetable-contamination context and as a pointer to older city-specific primary studies. Values from this page should remain C-tier secondary evidence unless the original cited studies are retrieved and ingested. Table 6 and Table 12 soil values are exposure-context and supply-chain data; they should not be pooled as product occurrence rows. Total As, total Hg, and total Cr labels should be preserved because the review does not report speciation.

Wiki pages this source may touch

• non-root-vegetables
• leafy-vegetables-other
• root-tuber-vegetables
• rice-bulk-grain
• other-grain-products
• vegetables
• leafy-vegetables
• root-vegetables
• rice
• maize
• lead
• cadmium
• mercury-total
• arsenic-total
• chromium
• nickel
• copper
• zinc

Verification notes

• Identity checks before writing found no existing DOI, raw-handle, or cite-key page for 10.1081/fri-100100288, MFK_zhou2000, or zhou2000-china-vegetable-heavy-metals-review.
• All Key numbers were rechecked against /tmp/hmi-june9-zhou2000.txt, extracted with pdftotext -layout, especially Tables 2-11.
• Speciation check: the food tables report As, Hg, and Cr only; this page records them as tAs, tHg, and total Cr. No inorganic arsenic, methylmercury, or Cr(VI) food values are inferred.
• Units are preserved as mg/kg; no unit conversions were performed.
• Evidence tier C reflects secondary review status. The review reproduces city-study tables but does not expose the original laboratory methods or complete primary sampling frames.
• Product-scope note: Table 5 includes mealie and paddy along with vegetables; frontmatter therefore includes broad grain/rice routing in addition to vegetable routing.
• Brand firewall: no brands are reported.
• Missing slug note: the taxonomy snapshot has no exact product slugs for all vegetable commodity names in the review. Frontmatter uses broad vegetable, leafy-vegetable, root/tuber, rice, and other-grain rows while commodity names remain in table text.

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.