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Home Environment

Heavy metal toxicity

March 29, 2020
in Environment
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Why in news?

  • According to National Environmental Engineering Research Institute (NEERI) study, vegetables grown on the Yamuna floodplain have been found to contain high doses of lead.

Findings of the report:

  • Though, in 2015, the NGT had banned the cultivation of edible crops and fodder on the floodplain saying that such vegetables were highly contaminated, the practice has continued.
  • While the safe limit for lead in vegetables has been set at 2.5mg/kg by the FSSAI, the level of the metal detected in vegetable samples collected from the floodplain ranges from 2.8mg/kg to 13.8mg/kg.
  • Except for cabbage, lead levels were found to be above the standard in all vegetables collected from vendors, with the highest level found in spinach (14.1 mg/kg).
  • The heaviest lead contamination was found in coriander collected from east Delhi.
  • Even though only 2% of the Yamuna’s stretch passes through Delhi, it receives around 70% of the Capital’s polluted water.
  • The source of lead could be industries dealing in automobile parts, batteries, paint and polythene.

Effects:

  • Lead overexposure may cause children to be less playful, clumsier, irritable, and sluggish.
  • They experience learning or behavioral problems such as mental retardation and selective deficits in language, cognitive function, balance, behavior, and school performance.
  • In adults, overexposure to lead may cause high blood pressure and damage to the reproductive organs.
  • Low levels of iron in the red blood cells (anemia), peripheral neuropathy, and, in some cases, brain damage (encephalopathy).

 

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Tags: Prelims

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