Review Article
Sensing Heavy Metals Using Mesoporous-Based Optical Chemical Sensors
Table 1
Standards and guidelines for heavy metals in drinking water set by WHO, EPA, and EU legislation [
3–
5].
| Metal | WHO (mg/L) | EPA (mg/L) | EU (mg/L) |
| Hg | 0.006 | 0.002 | 0.001 | Cu | 2 | 1.3 | 2 | Zn | — | 5 | — | Pb | 0.010 | 0.015 | 0.01 | Cr | 0.05 | 0.1 | 0.05 |
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