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High fluoride content found in Khordha, Nayagarh groundwater

  • Posted By
    10Pointer
  • Categories
    Environment
  • Published
    13th Nov, 2020

Context

A study has found the high fluoride concentration in groundwater in parts of Khordha and Nayagarh districts in Odisha. This can be a serious threat to human health.

Key highlights

  • The high fluoride concentrations have also been recorded in groundwater near geothermal regions in Telangana, Rajasthan and Gujarat.
  • The region in Eastern Ghats comprises deformed metamorphic and igneous rocks, containing fluoride-bearing minerals.

Permissible limit

  • Bureau of Indian Standard permissible limit of fluoride is 1 mg / l. and some samples had more than 3.5 milligrams per litre (mg / l), much above the permissible limit.

What are the reasons behind the accumulation?

  • The accumulation of fluoride in water is not due to evapotranspiration or due to calcite precipitation. Fertilizers are sources of fluoride contamination.

How it can be treated?

  • Defluoridation using coagulation precipitation
  • Membrane-based techniques

Why it is useful fluoride?

  • Adding fluoride to the water supply reduces the incidence of tooth decay.
  • Fluoride protects teeth from decay by demineralization and remineralization.

Harmful impacts of high concentration

  • Dental fluorosis, Skeletal fluorosis, Neurological problems, cardiovascular problems,Fluoride poisoning. Acute, high-level exposure to fluoride can lead to:abdominal pain, excessive saliva, nausea and vomiting, seizures and muscle spasms