Rice finding 1452
Source evidence and comparison details for the Rice profile.
Unpolished rice (husk removed during preparation; brown/red rice) · Lead (Pb) · 1 rice samples (seven varieties; four varieties as unpolished/polished pairs).
Selected finding and reference
1 rice samples (seven varieties; four varieties as unpolished/polished pairs). Basis: unspecified.
authors state all samples were above the limits of detection
HMI baseline position
Limited data · HMI uncooked-grain Pb reference · 10 sampling families. Individual sample as reported: 15 µg/kg. HMI median 25; Q1 10–15.5 (bounded); Q3 54.5–64.5 (bounded) µg/kg. 10 families. Reporting bounds prevent a rating.
Reporting bounds or insufficient reference spread prevent a stable Low / Moderate / High classification.
This finding’s sampling family contributes to the fixed reference.
Sensitivity to weighting
Equal subgroup weight within each family: Limited data. The position remains unresolved under this alternative. This check does not address all sampling, rounding or analytical uncertainty.
Sensitivity to source selection
- Without Myat Soe et al. (2023): Limited data.
- Without Alrashdi et al. (2024): Limited data.
- Without WHO GEMS/Food: Limited data.
- Without Mari et al. 2016: Moderate.
- Without Authors 2016: Moderate.
- Without Bazie et al. 2022: Moderate.
- Without Gama et al. 2025: Moderate.
- Without Ibrahim et al. 2024: Moderate.
- Without Lockwood et al. 2023: Limited data.
- Without Yan et al. (2025): Moderate.
These checks show dependence on each sampling family; they are not confidence intervals.
Collection period
Collection date unreported
No year-by-year sample register is reconstructed from this summary.
Geographic scope
Ran Kahawanu
Rice variety or type within one study.
Sampling, analysis and reporting limits
10-20 grains ground, HNO3/HCl overnight digest, solution ICP-MS (Agilent 7700s) with Rh internal standard, 8-point calibration 0.6-600 µg/kg; LA-ICP-MS imaging (unquantified).
authors state all samples were above the limits of detection
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 |
|---|---|---|
| sample_value | 15 ± 3 | none |
Original SD: 3 μg kg−1.
Table 2, row 'Ran Kahawanu', column Pb; p.2895.
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.
Open the primary publication · HMI source record
Reference and scope
HMI uncooked-grain Pb reference · 10 sampling families. Uncooked grain as analysed (native or unstated moisture), µg/kg. Distribution of subgroup median concentration values.
| Reference (µg/kg) | Q1 | Median | Q3 |
|---|---|---|---|
| Primary HMI reference | 10–15.5 (bounded) | 25 | 54.5–64.5 (bounded) |
| Alternative weighting | 10–15.5 (bounded) | 25 | 54.5–64.5 (bounded) |
82 reference units; 10 sampling families. Counts describe evidence units, not independent studies or certainty.
| Contributing family | Reference units | Weight |
|---|---|---|
| Myat Soe et al. (2023) | 5 | 10% |
| Alrashdi et al. (2024) | 6 | 10% |
| WHO GEMS/Food | 41 | 10% |
| Mari et al. 2016 | 3 | 10% |
| Authors 2016 | 3 | 10% |
| Bazie et al. 2022 | 5 | 10% |
| Gama et al. 2025 | 1 | 10% |
| Ibrahim et al. 2024 | 1 | 10% |
| Lockwood et al. 2023 | 11 | 10% |
| Yan et al. (2025) | 6 | 10% |
Methods
HMI calculates a pooled distribution of subgroup medians across the admitted sampling families. HMI pools subgroup medians from every compatible rice sampling family in the evidence ledger for this analyte, material and basis: published subgroup medians, medians HMI calculates from printed per-sample values and WHO GEMS/Food region-by-year medians (random sampling only). Each family has equal total weight; subgroups have equal weight within a family. Non-detects stay as zero-to-limit intervals, so quartiles carry lower and upper bounds. Means, ranges and maxima never enter as observations. Dry-weight, native-moisture and cooked results are kept in separate references; no moisture conversion is assumed.
Inverse weighted empirical CDF; midpoint at exact cumulative-weight boundaries. At least four reference units and a definitely positive Q1–Q3 spread are required. This is a display eligibility rule, not statistical validation.
Limitations
An evidence-library reference, not a probability sample of the world rice market. Sampling families differ in frame (retail, farm, contaminated sites, monitoring) and period; GEMS/Food regions are reporting regions, not growing origins. Many submissions are non-detects with differing limits, which widens the bounds. A position is descriptive concentration, not a safety or compliance judgment.
Admitted source families
- Myat Soe et al. (2023)
- Alrashdi et al. (2024)
- WHO GEMS/Food
- Mari et al. 2016
- Authors 2016
- Bazie et al. 2022
- Gama et al. 2025
- Ibrahim et al. 2024
- Lockwood et al. 2023
- Yan et al. (2025)
Reference version and interpretation
Frozen evidence selection: 2026-10-22. Method: hmi-pooled-reference-v2.
hmi-pooled-reference-v2:rice-native-Pb:4a9266cf68b5
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.