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A sample of water taken from an underground lake was analyzed and found to contain fluoride, lead, nitrate, and iron at concentrations of 1000 ppb, 40 ppb, 100 ppm, and 0.2 ppm, respectively. This water is unfit for drinking because of the elevated level of:

1. Nitrate
2. Iron
3. Fluoride
4. Lead

Correct answer: Nitrate

Solution

Nitrate levels above 10 ppm can pose serious health risks, particularly for infants, as they can interfere with oxygen transport in the blood. The concentration of 100 ppm in this sample significantly exceeds safe drinking water standards, making it the primary concern.

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