Rice finding 1588
Source evidence and comparison details for the Rice profile.
Rice grain unspecified (field-collected composite grain; husking/milling not stated) · Lead (Pb) · 20 composite grain samples (one per paddy-field site).
Selected finding and reference
20 composite grain samples (one per paddy-field site). Basis: dry weight (grains dried at 70 C to constant weight; Fig. 4 caption 'on dry weight basis').
Values below detection limits replaced by half the detection limit for correlation analysis only; exceedance counts not affected
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
Collection date unreported
No year-by-year sample register is reconstructed from this summary.
Geographic scope
Paddy fields
Sampling site within one study.
Sampling, analysis and reporting limits
Grains washed, dried 105 C 30 min then 70 C to constant weight, ground (0.15 mm); 0.25 g digested with HNO3/H2O2 (5:1) by microwave; crop metals by HR-ICP-MS (Element II) per Methods, although Abstract says ICP-AES.
Values below detection limits replaced by half the detection limit for correlation analysis only; exceedance counts not affected
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 | Pb concentrations in 70% of the rice grain samples exceeded the maximum allowable Pb levels in food (0.2 mg/kg (GB 2762-2005)) | none (percentage; threshold 0.2 mg/kg = 200 ug/kg) |
Results, 'Heavy metal concentrations in rape, wheat and rice grains', p.8; Fig. 4 (image).
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.