ANSWER: 50
Explanation:
- As per Indian standard IS10500 for drinking water, the maximum permissible concentration of Cr(VI) in drinking water is 50 microgram per litre.
- The US Environmental Protection Agency (EPA) recommends a still lower permissible concentration of 10 microgram per liter.
- Detection of Cr(VI) at such low levels is not only technically challenging but also expensive and time consuming since it involves collection of water samples from affected areas, transport to laboratory, storage and finally analysis.
- The new BARC portable kit method can be used for limited water samples with errors due to conversion of Cr(III) to Cr(VI) and vice versa during transport and storage.
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