Wang et al. 2019 - Dietary lead exposure in Guangzhou foods

Wang and colleagues estimated dietary lead exposure for Guangzhou residents using lead concentrations from the local food safety risk monitoring system. The occurrence dataset included 6339 samples across 27 food categories collected in 2014-2017. The paper reports lead only; it does not measure arsenic, cadmium, mercury, chromium, or tin.

Key numbers

Table 2 reports lead concentrations in food in mg/kg:

The source states that lead concentrations were below the LOD in 28.4% of samples, for an overall detection rate of 71.6%. It identifies the highest average lead concentrations as algae (dry) at 0.3947 mg/kg, dried seafood at 0.3219 mg/kg, mollusks at 0.1384 mg/kg, edible fungi at 0.0729 mg/kg, wheat flour and products at 0.0509 mg/kg, bulb vegetables at 0.0505 mg/kg, meat products at 0.0394 mg/kg, leafy vegetables at 0.0354 mg/kg, rice and rice products at 0.0341 mg/kg, and preserved eggs at 0.0341 mg/kg.

The abstract and Tables 3-4 report these exposure/risk summary values:

Table 3 reports total-population contribution fractions of 21.42% for rice and rice products, 20.01% for leafy vegetables, 11.75% for wheat flour and products, 5.45% for pig meat, 5.33% for fruiting vegetables, 4.74% for algae, 3.64% for flour products with fillings, and 3.47% for fruit.

Methods (brief)

Lead concentration data came from the Guangzhou food safety risk monitoring system for 2014-2017. Investigators acting as consumers purchased samples from retailers including supermarkets, restaurants, agricultural product wholesale markets, and stores. After edible-portion preparation, samples were homogenized, digested in acid, and analyzed by ICP-MS. Non-detected results were assigned a value of 1/2 LOD for occurrence and dietary exposure calculations; the authors report a lead LOD of 0.003 mg/kg.

Implications

This source contributes Guangzhou market-food occurrence data for Pb across rice, wheat flour products, vegetables, meats, dairy, fish, shellfish/seafood, algae, and fungi. It is routeable to broad food-product pages as a multi-category monitoring dataset. The source supports lead occurrence and dietary-exposure context only; it does not provide per-brand contamination values or other HMTc analytes.

Verification notes

• PDF text extracted with pdftotext -layout; title page, methods, Table 2, Table 3, Table 4, conclusions, and license text were readable.
• DOI 10.3390/ijerph16081417, raw handle MFK_wang2019, and cite-key checks found no existing source page before creation.
• Table 2 values were checked against the extracted text and a rendered page image. The milk row is internally anomalous in the source table (P50 0.0500 and P95 0.0050); this page preserves the printed values and does not correct them.
• Units are copied as reported: concentrations in mg/kg and dietary intake in µg/kg bw/day. No unit conversion was performed.
• Speciation: the paper reports lead only.
• Brand firewall: sampling locations are broad retail channels; no brand-level contamination values are reported.
• Frontmatter product and ingredient slugs were checked against docs/gpt-collaboration/taxonomy-snapshot.md; no new slug was invented. Milk and milk-powder findings remain represented by the [[ingredients/milk-and-dairy]] ingredient because the current product snapshot does not list a dairy product slug.

Page history

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