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Heavy Metals Contaminating India’s Rivers

Posted on : 20 Jan 2020

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  • According to the Report, samples taken from two-thirds of water quality stations on major rivers revealed the presence of a heavy metal (or in some cases more than one) beyond limits specified by the Bureau of Indian Standards.
  • The Central Water Commission (CWC) has collected a total of 442 surface water samples, of which 287 were found to be polluted by heavy metals.
  • The exercise was limited to surface water and did not cover groundwater contamination.
  • The most common heavy metal found was iron, and above safe limits in 156 samples.
  • Lead, nickel, chromium, cadmium and copper were the other metals.
  • The CWC study covered 67 rivers in 20 river basins, and across three seasons.
  • According to the report, Arsenic and zinc are the two toxic metals whose concentration was always obtained within the limits throughout the study period.
  • For other metals, contamination levels changes with the season.
  • For instance, iron contamination was persistent through most of the Ganga during monsoon but dipped significantly during the non-monsoon periods.

Article Related Questions

  1. Consider the following statements
    1.The exercise was limited to surface water and did not cover groundwater contamination.
    2.The most common heavy metal found was iron.
    3.Arsenic and zinc are the two toxic metals whose concentration was always obtained within the limits.
    Which of the following statement is/are correct?

  2. 1.1 only

    2.2 and 3 only

    3.1 and 3 only

    4.1, 2 and 3

    Right Ans : 1, 2 and 3

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