Table 3.
Estimated daily intake of toxic metals (ug/day) in saltpetre samples.
| Sampling site | Lead ± SD | Arsenic ± SD |
|---|---|---|
| ABU | 0.202 ± 0.027 | 0.243 ± 0.077 |
| ASA | 0.199 ± 0.035 | 0.288 ± 0.064 |
| ASY | 0.250 ± 0.025 | 0.273 ± 0.077 |
| AYI | 0.172 ± 0.000 | 0.246 ± 0.019 |
| BAN | 0.246 ± 0.000 | 0.191 ± 0.034 |
| CEN | 0.229 ± 0.029 | 0.397 ± 0.147 |
| KNU | 0.282 ± 0.061 | 0.432 ± 0.136 |
| KWA | 0.252 ± 0.088 | 0.496 ± 0.119 |
| SAN | – | 0.280 ± 0.128 |
| TAN | 0.189 ± 0.000 | 0.1567 ± 0.039 |
* Cadmium and mercury were below detection limit in almost all the saltpetre samples and are therefore not indicated in this table.