Rice finding 551
Source evidence and comparison details for the Rice profile.
Brown rice (rice grain oven-dried at 60 °C for 48 h, then de-husked) · Cadmium (Cd) · 201 paired soil/rice grain field composites (5 subsamples per paddy field).
Selected finding and reference
201 paired soil/rice grain field composites (5 subsamples per paddy field). Basis: dry weight (oven-dried 60 °C, 48 h).
not reported; minima (0.003-0.02 mg/kg) printed as measured values
HMI baseline position
Limited data: Reported as % of samples; a concentration reference in µg/kg cannot apply. Missing evidence never means low contamination.
Reported as % of samples; a concentration reference in µg/kg cannot apply.
Reference version and interpretation
Frozen evidence selection: 2026-10-22. Method: hmi-pooled-reference-v2.
No admitted reference
The reference is computed by HMI from admitted evidence, not copied from a study baseline. It describes the evidence currently in this scope; it is not a worldwide or current-lot benchmark. Source, year and region filters do not change it. Different HMI scopes are not one common ranking.
Collection period
2019
No year-by-year sample register is reconstructed from this summary.
Geographic scope
Xiangtan, Hunan, 2019 survey
Collection year within one study.
Sampling, analysis and reporting limits
Grain digested with concentrated HNO3 by microwave (CEM Mars); Cd by ICP-MS (PerkinElmer NexION 300) with In internal standard.
not reported; minima (0.003-0.02 mg/kg) printed as measured values
Shared samples and study overlap
Subgroup rows, statistics of the same subgroup and the study total share samples; they are not independent results.
Each table row describes a food/analyte result. Repeated rows do not add independent samples or datasets. No cross-study trend is calculated in this comparison mode.
Reported values, conversion and source locator
| Source statistic | Original result | Displayed unit conversion |
|---|---|---|
| exceedance_rate | the percentages of rice grain samples with Cd concentrations exceeding this limit were 87.5%, 37.8%, and 36.5% in 2016, 2019, and 2020 surveys | none (percentage; threshold 0.2 mg/kg = 200 µg/kg) |
Section 3.1 Paired soil and rice samples, paragraph 2 (page 4); Fig. 2b.
No moisture, cooking-yield or species conversion is applied to the original finding above. Any basis conversion used for its HMI comparison is stated separately with the numerical target.