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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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