Presence of nitrates in water in excess of 50 ppm causes________________?
Correct answer: A. Methemoglobinemia
- A. Methemoglobinemia
- B. Gastroenteritis
- C. Asphyxiation
- D. Tooth decay
Explanation
Excess nitrate is reduced to nitrite in the body, where it converts haemoglobin into methemoglobin and reduces oxygen-carrying capacity. This produces methemoglobinemia, especially in infants.
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