Table 2 Metal ion reference values
Normala | Optimalb | Acceptablec | Problematicc | Potentially Toxicb | |
|---|---|---|---|---|---|
Unilateral | |||||
• Co | <1.5 μg/L | <4.0 μg/L | 4–10 μg/L | 10–20 μg/L | >20 μg/L |
• Cr | <1.5 μg/L | <4.6 μg/L | 4.6–10 μg/L | 10–20 μg/L | >20 μg/L |
Bilateral | |||||
• Co | <1.5 μg/L | <5.0 μg/L | 5–10 μg/L | 10–20 μg/L | >20 μg/L |
• Cr | <1.5 μg/L | <7.4 μg/L | 7.4–10 μg/L | 10–20 μg/L | >20 μg/L |