Li et al. 2017 — Cadmium transfer from Jiangsu soils into rice

Li and colleagues studied cadmium transfer through a soil-rice-human chain in southern Jiangsu Province, China. The authors collected 70 paired Indica rice-grain and surface-soil samples, measured Cd and Zn by ICP-MS, and used RIVM in vitro digestion to estimate bioaccessible Cd in rice grain. The source is a supply-chain occurrence paper: rice-grain Cd is the product-facing evidence, while soil chemistry and extractable Cd/Zn are context for predicting rice Cd and bioaccessible rice Cd.

Key numbers

The rice-grain exceedance percentages are product-facing occurrence evidence for rice-bulk-grain. Soil Cd, CaCl2-extractable Cd/Zn, and regression equations are retained as supply-chain context and should not be entered as product concentration values.

Methods (brief)

The authors collected paired rice grains and 0-15 cm soils from Yifeng, Dingshu, Ehu, Wangting, and Taicang in southern Jiangsu Province. Soil samples were air-dried, ground, and sieved; rice grains were oven-dried at 105 deg C for 1 h and then at 70 deg C to constant weight, ground, and sieved. Rice samples were digested with HClO4 and HNO3 for 6 hours, and Cd/Zn concentrations were determined by ICP-MS (XSERIES, Thermo Electron). CaCl2-extractable Cd and Zn were obtained with 0.01 M CaCl2 shaken for 16 hours at a 10:1 solution-to-soil ratio. Cd bioaccessibility in rice grain was measured with the RIVM in vitro digestion model. QA/QC used certified reference materials GBW10010 for rice plants and GBW07442, GBW07443, GBW07402, GBW07403, GBW07404, and GBW07406 for soils; recoveries were 93-105% for GSB-1 and 95-105% for the soil CRMs, with replicate relative difference below 5%.

Implications

This source supports rice-bulk-grain cadmium routing for a Chinese contaminated-soil supply-chain setting. It provides an unusually explicit bridge between soil phytoavailable Cd, total rice-grain Cd, and bioaccessible rice Cd, but the source page should keep those compartments separate: soil numbers describe the field environment, rice exceedance percentages describe the edible product, and RIVM outputs describe digestive bioaccessibility. Because the extracted text does not provide a clean sample-level or area-level numeric rice Cd table, downstream pooling should use this paper cautiously unless the formatted final article or figure data are retrieved.

Verification notes

• PDF text extracted with pdftotext -layout; the accepted-manuscript text, methods, soil Table 1, regression Tables 2-4, and Results prose were readable.
• DOI verified from the accepted-manuscript cover and running headers as 10.1039/C6EM00631K; DOI, raw handle MFK_li2017, and cite-key checks found no existing source page before creation.
• All numbers above were checked against the extracted abstract, sampling/methods text, Results sections 3.1-3.5, and Tables 1-4.
• Units are preserved as reported (mg kg-1, percentages, R2 values); no dry-weight to wet-weight or food-basis conversion was performed.
• Speciation: cadmium is reported as Cd; no arsenic, mercury, or chromium speciation issue applies.
• Rice occurrence vs soil context: soil Cd and CaCl2-extractable values are not product concentration values. This page routes to rice because the source reports rice-grain Cd exceedance percentages and rice-grain Cd models from paired soil/rice sampling.
• Exact sample-level or area-mean rice Cd concentrations were not cleanly available in the extracted text; the page therefore does not invent or visually estimate them from figures.
• Frontmatter product and ingredient slugs were checked against docs/gpt-collaboration/taxonomy-snapshot.md; no new product or ingredient slug was invented.

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.