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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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