Toxic substances

Standards (WHO, 2006)

Arsenic

0.01 mg/L

Cadmium

0.003 mg/L

Chromium

0.05 mg/L

Copper

2 mg/L

Iron

0.3 mg/L

Mercury

0.006 mg/L

Nickel

0.07 mg/L

Lead

0.01 mg/L