Cadmium transfer from contaminated soils to the human body through rice consumption in southern Jiangsu Province, China

Overview

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 cadmium (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.

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.