Overview
This field study measured cadmium and arsenic species in brown rice grains from 208 rice cultivars grown in South China. It is useful for rice occurrence and cultivar-screening context because the paper reports ranges, means, medians, exceedance rates, and arsenic speciation in the edible grain.
Key numbers
- The study covered 208 cultivars: 83 inbred rice cultivars and 125 hybrid rice cultivars.
- Brown-rice Cd ranged from not detected to 1.61 mg/kg, with a mean of 0.26 +/- 0.32 mg/kg and a median of 0.11 mg/kg.
- Brown-rice total As ranged from 0.08 to 0.67 mg/kg, with a mean of 0.27 +/- 0.10 mg/kg and a median of 0.25 mg/kg.
- Cd exceeded the Chinese rice limit in 35.1% of cultivars; inorganic As exceeded the Chinese rice limit in 52.4% of cultivars.
- Inorganic As ranged from 0.06 to 0.48 mg/kg, with mean and median values of 0.21 and 0.20 mg/kg.
- DMA averaged 0.02 +/- 0.02 mg/kg and MMA averaged 0.004 +/- 0.004 mg/kg; inorganic As averaged 89.7% of the speciated arsenic pool.
Methods
The paper analyzed brown rice grain from field-grown cultivars and separated arsenic species. The source is a preprint, so its values should be routed with that evidence-tier caveat rather than treated as a final peer-reviewed market survey.
Implications
The source supports rice-bulk-grain gap filling for Cd, total As, and inorganic As in China-grown rice cultivars. It is strongest for cultivar-level occurrence and co-accumulation context, not for finished retail-market pooling outside the study geography.
Related evidence
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