Rice finding 1371
Source evidence and comparison details for the Rice profile.
Brown rice (husked; field-collected paddy threshed to brown rice) · Lead (Pb) · 220 site composites (5 sub-samples per site).
Selected finding and reference
220 site composites (5 sub-samples per site). Basis: air-dried to <13% moisture (as-analysed brown rice powder).
Treatment of values below the method detection limit not stated
HMI baseline position
Limited data: Held: Table 2 CV and skewness columns are inconsistent with the printed mean/SD (e.g., tAs SD/mean = 59% vs CV 167.9%; Pb 188% vs 53.8%; Cr 260% vs 38.4%) and the text gives skewness 1.91-3.72 whereas the table prints 4.26 and 5.18 for tAs and Cr; columns appear misaligned. Missing evidence never means low contamination.
Held: Table 2 CV and skewness columns are inconsistent with the printed mean/SD (e.g., tAs SD/mean = 59% vs CV 167.9%; Pb 188% vs 53.8%; Cr 260% vs 38.4%) and the text gives skewness 1.91-3.72 whereas the table prints 4.26 and 5.18 for tAs and Cr; columns appear misaligned.
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
Xiangtan County
Sampling site within one study.
Sampling, analysis and reporting limits
Pb, Cd, Cr: HNO3-HClO4 (9:1) digestion, ICP-MS (Thermo XSeries 2); tAs: HNO3-HClO4 wet digestion, AFS; Hg: microwave digestion, AFS; iAs: 0.15 mol/L HNO3 extraction 90 °C 2.5 h, LC-AFS (GB 5009.11-2014 approach).
Treatment of values below the method detection limit not stated
Held: Table 2 CV and skewness columns are inconsistent with the printed mean/SD (e.g., tAs SD/mean = 59% vs CV 167.9%; Pb 188% vs 53.8%; Cr 260% vs 38.4%) and the text gives skewness 1.91-3.72 whereas the table prints 4.26 and 5.18 for tAs and Cr; columns appear misaligned.
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 |
|---|---|---|
| mean | 0.08±0.15 | mg/kg x 1000 |
Original SD: 0.15 mg·kg−1.
Table 2 (Concentration characteristics of iAs and some heavy metals in rice, N=220), p.11514; Results 'Contamination profile' text.
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.