Table 3 Excessive heavy metals in locally grown rice.
From: Assessment of environmental impacts of heavy metal pollution in rice in Nanning, China
Testing project | Number of samples (copies) | Number of detections (copies) | Detection rate (%) | Maximum detectable value (mg/kg) | Average value (mg/kg) | Aetection limit(mg/kg) | Exceedance (copies) | Exceedance rate (%) | Exceeding the standard (mg/kg) | Pi |
|---|---|---|---|---|---|---|---|---|---|---|
Lead | 605 | 303 | 50 | 1.77 | 0.073 ± 0.187 | < 0.0040 | 16 | 2.64 | 0.2 | 0.37 |
Cadmium | 605 | 577 | 95 | 1.28 | 0.124 ± 0.137 | < 0.030 | 89 | 14.71 | 0.2 | 0.62 |
Total mercury | 605 | 604 | 99 | 0.038 | 0.008 ± 0.006 | < 0.0005 | 4 | 0.66 | 0.02 | 0.4 |
Zinc | 605 | 59 | 98 | 41.8 | 15.71 ± 3.494 | < 0.0050 | – | – | – | – |
Inorganic arsenic | 605 | 591 | 97 | 0.5 | 0.168 ± 0.087 | < 0.0500 | 34 | 5.62 | 0.2 | 0.84 |
Selenium | 605 | 560 | 92 | 0.6 | 0.060 ± 0.004 | < 0.0040 | – | – | – | – |
