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Introduction to Arsenic

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  1. 1. Anup Ghimire Rock Face Limited
  2. 2.  Natural inorganic silver grey or white brittle odourless and tasteless metal.  GroupV element in periodic table  20th position for its abundance in the earth’s crust, 14th in sea water and 12th in human body.
  3. 3.  Mining, glass processing and landfill leaching  Semiconductor applications, solar cells and opto- electronic devices  Soil sterilizers, glassware production, polymerisation of unsaturated compounds
  4. 4.  Distributed in air, soil and water.  Foods such as meat, fish, poultry, grain and cereals.  Arsenic occurs in groundwater as oxidised forms (As (III)) and reduced forms (As (V)).
  5. 5.  Arsenic sulfide, arsenic rich pyrite and arsenic rich iron oxyhydrides  Agrochemicals, wood preservatives, industrial waste disposal, mining and mineral processing, acid mine drainage and burning of fossil fuels.
  6. 6.  Acute Health Effects: vomiting, abdominal pain and diarrhoea.  Long term exposure: pigmentation changes, skin lesions, hard patches on the palms and soles of the feet (hyperkeratosis), developmental effects, neurotoxicity, diabetes and cardiovascular diseases
  7. 7.  Precipitation  Sedimentation  Coagulation  Conventional Filtration  Oxidation  Adsorption  Membrane Filtration