Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre?
Correct answer: B. 42
- A. 22
- B. 42
- C. 332
- D. 1050
Explanation
The historical water-supply limit listed for DDT in many chemical-engineering environmental tables is about 42 micrograms per litre. This is a table-value question, and current regulatory limits may differ considerably.
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