Q.

What is the permitted concentration of manganese in drinking water?

A. 30 g/l
B. 40 g/l
C. 50 g/l
D. 60 g/l
Answer» C. 50 g/l
Explanation: the permitted concentration of manganese in drinking water is 50g/l. the manganese greensand process has been used in the united states since the 1950s.
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