The maximum permissible total dissolved solids content in water for domestic purposes should not exceed
- A300 ppm
- B400 ppm
- C500 ppmCorrect
- D1000 mm
Solution
Concept
Maximum permissible total dissolved solids in water
Formula
NONE
Step-by-step solution
1. Total dissolved solids (TDS) measure inorganic salts and organic matter dissolved in water. 2. According to standard drinking water guidelines, the desirable upper limit for TDS is 500 ppm. 3. Exceeding 500 ppm can impart undesirable taste and cause gastrointestinal distress. Answer: C
Explanation
Total dissolved solids measure the concentration of dissolved inorganic salts and organic matter present in water. Standard drinking water quality guidelines specify a maximum permissible limit of 500 ppm or mg/L for domestic consumption. Exceeding this threshold can impart an undesirable taste and lead to gastrointestinal distress.
Why the other options are wrong
A) 300 ppm is below the acceptable upper limit of 500 ppm for total dissolved solids in drinking water. B) 400 ppm is below the maximum acceptable limit of 500 ppm. D) 1000 mm uses incorrect units of measurement and represents the permissible limit of 1000 ppm in the absence of an alternate source.
Shortcut
Maximum permissible TDS limit for drinking water is 500 ppm.
Common mistake
Confusing the standard desirable limit for total dissolved solids (500 ppm) with lower optimal values or higher cause-for-rejection limits.
Correct answer: C) 500 ppm