Rice finding 2587
Source evidence and comparison details for the Rice profile.
Dehusked field-collected rice grain (brown) · Dimethylarsinic acid (DMA) · 20 rice samples (field composites per site; commercial packs).
Selected finding and reference
20 rice samples (field composites per site; commercial packs). Basis: dry weight.
Values below LOD assigned 1/2 LOD by the source for statistics (Section 2.5); medians/min reported as printed
HMI baseline position
Low · HMI dry-grain DMA reference · 3 sampling families. Median as reported: 17 µg/kg. HMI median 55; Q1 31; Q3 84 µg/kg. 3 families. Not a safety grade.
Low is below Q1; Moderate includes Q1 through Q3; High is above Q3. Reporting bounds must give the same category throughout.
This finding’s sampling family contributes to the fixed reference.
Sensitivity to weighting
Equal subgroup weight within each family: Low. The position is unchanged under this alternative. This check does not address all sampling, rounding or analytical uncertainty.
Sensitivity to source selection
- Without FDA rice survey (2013): Low.
- Without Carey et al. (2020): Low.
- Without Signes-Pastor et al. 2016: Low.
These checks show dependence on each sampling family; they are not confidence intervals.
Collection period
2014
No year-by-year sample register is reconstructed from this summary.
Geographic scope
all field samples
All samples in the study.
Sampling, analysis and reporting limits
Freeze-dried, ball-milled; 1% HNO3 microwave extraction with H2O2 oxidation, IC-ICP-MS (Thermo AS7 column, iCAP Q) for As species; HNO3/H2O2 microwave digestion and ICP-MS for Cd.
Values below LOD assigned 1/2 LOD by the source for statistics (Section 2.5); medians/min reported as printed
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 |
|---|---|---|
| median | DMA ... 0.017, 0.003–0.073 mg/kg | mg/kg x 1000 |
Section 3.5, p.358-359.
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 dry-grain DMA reference · 3 sampling families. Dry-weight grain, µg/kg dry weight. Distribution of subgroup median concentration values.
| Reference (µg/kg) | Q1 | Median | Q3 |
|---|---|---|---|
| Primary HMI reference | 31 | 55 | 84 |
| Alternative weighting | 31 | 55 | 84 |
46 reference units; 3 sampling families. Counts describe evidence units, not independent studies or certainty.
| Contributing family | Reference units | Weight |
|---|---|---|
| FDA rice survey (2013) | 8 | 33% |
| Carey et al. (2020) | 29 | 33% |
| Signes-Pastor et al. 2016 | 9 | 33% |
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
Reference version and interpretation
Frozen evidence selection: 2026-10-22. Method: hmi-pooled-reference-v2.
hmi-pooled-reference-v2:rice-dry-DMA:6cd4368d3cb7
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.