Table 4 Excessive heavy metals in locally grown rice.
From: Assessment of environmental impacts of heavy metal pollution in rice in Nanning, China
Surveillance project | Maximum detectable value (mg/kg) | Detection limit (mg/kg) | Exceedance (copies) | Exceedance rate (%) | Over standard (mg/kg) | Pi value |
|---|---|---|---|---|---|---|
Lead | 1.77 | < 0.0040 | 16 | 2.64 | 0.2 | 0.37 |
Cadmium | 1.28 | < 0.0030 | 89 | 14.71 | 0.2 | 0.62 |
Total mercury | 0.038 | < 0.0005 | 4 | 0.66 | 0.02 | 0.4 |
Zinc | – | < 0.0050 | – | – | – | – |
Inorganic arsenic | 0.5 | < 0.0050 | 34 | 5.62 | 0.2 | 0.84 |
Selenium | – | < 0.0040 | – | – | – | – |
