Rice finding 1500
Source evidence and comparison details for the Rice profile.
Rice grain unspecified (market rice, crushed to powder before digestion) · Lead (Pb) · 3912 rice samples.
Selected finding and reference
3912 rice samples. Basis: unspecified (no drying or moisture correction stated).
Source substitutes LOD/2 for results below LOD (section 2.4); LOD values are not reported. Statistics include those substituted values; minima (and medians/percentiles where the detection rate is below 50%) equal the substitution value, not a measurement.
HMI baseline position
Limited data: Held: urban median Pb printed as 0.160 mg/kg, which exceeds the urban mean (0.026), the urban 95th percentile (0.025) and, for Pb, nearly the urban max; the printed value is impossible and is probably a typesetting error (rural and overall medians are 0.015 Cr / 0.025 Pb). Missing evidence never means low contamination.
Held: urban median Pb printed as 0.160 mg/kg, which exceeds the urban mean (0.026), the urban 95th percentile (0.025) and, for Pb, nearly the urban max; the printed value is impossible and is probably a typesetting error (rural and overall medians are 0.015 Cr / 0.025 Pb).
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
2020–2022
No year-by-year sample register is reconstructed from this summary.
Geographic scope
Urban
Sampling site within one study.
Sampling, analysis and reporting limits
ICP-MS after microwave digestion of 0.3 g powder in 7 mL HNO3 (section 2.2); no arsenic speciation step described.
Source substitutes LOD/2 for results below LOD (section 2.4); LOD values are not reported. Statistics include those substituted values; minima (and medians/percentiles where the detection rate is below 50%) equal the substitution value, not a measurement.
Held: urban median Pb printed as 0.160 mg/kg, which exceeds the urban mean (0.026), the urban 95th percentile (0.025) and, for Pb, nearly the urban max; the printed value is impossible and is probably a typesetting error (rural and overall medians are 0.015 Cr / 0.025 Pb).
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 | Median 0.160 | mg/kg x 1000 |
Table 3 (levels of heavy metals in rice in urban and rural areas of Henan, mg/kg), Urban rows, column Pb; page 5.
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.