Rice finding 1833
Source evidence and comparison details for the Rice profile.
White rice, prepared to a ready-to-eat state · Inorganic arsenic (iAs) · Sample count unreported.
Selected finding and reference
Sample count unreported. Basis: as prepared, ready-to-eat (as consumed).
Upper-bound mean with non-detects set to LOR (nd=LOR); proportion of rice composites with detectable iAs not stated in main report
HMI baseline position
Moderate · HMI cooked-rice iAs reference · 3 sampling families. Mean as reported: 30 µg/kg. HMI median 28.5; Q1 28; Q3 41.6 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 is an external comparison; the finding does not set the reference.
Sensitivity to weighting
Equal subgroup weight within each family: Moderate. The position is unchanged under this alternative. This check does not address all sampling, rounding or analytical uncertainty.
Sensitivity to source selection
- Without FDA Total Diet Study, FY2018–FY2020: High.
- Without WHO GEMS/Food: Limited data.
- Without Baxter et al. 2015: Moderate.
These checks show dependence on each sampling family; they are not confidence intervals.
Collection period
2013–2014
No year-by-year sample register is reconstructed from this summary.
Geographic scope
White rice (25th ATDS food 'rice')
All samples in the study.
Sampling, analysis and reporting limits
ICP-MS after acid digestion (Cd, Pb, Hg, As); iAs by HPLC-ICP-MS after freeze drying and enzymatic digestion (Symbio Laboratories, NATA accredited except iAs and organic Hg methods, pending at the time).
Upper-bound mean with non-detects set to LOR (nd=LOR); proportion of rice composites with detectable iAs not stated in main report
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 | It was detected in three foods with mean concentrations (nd=LOR) in mussels of 0.28 mg/kg, white rice of 0.03 mg/kg and sushi rolls (nori) of 0.01 mg/kg. | mg/kg x 1000 |
Inorganic arsenic, Analytical Results, p.36; Table 1 (iAs analysed in rice), p.18; Table 2 (iAs LOR 0.01 mg/kg, HPLC-ICP-MS), p.19.
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 cooked-rice iAs reference · 3 sampling families. Cooked rice as prepared, µg/kg as eaten. Distribution of sample or subgroup median concentration values.
| Reference (µg/kg) | Q1 | Median | Q3 |
|---|---|---|---|
| Primary HMI reference | 28 | 28.5 | 41.6 |
| Alternative weighting | 28 | 28.5 | 41.6 |
15 reference units; 3 sampling families. Counts describe evidence units, not independent studies or certainty.
| Contributing family | Reference units | Weight |
|---|---|---|
| FDA Total Diet Study, FY2018–FY2020 | 1 | 33% |
| WHO GEMS/Food | 13 | 33% |
| Baxter et al. 2015 | 1 | 33% |
Methods
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, FDA Total Diet Study cooked composites 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-cooked-iAs:6d709469f065
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.