Arsenik : förekomst, miljö och hälsoeffekter

Detta är en Kandidat-uppsats från Lunds universitet/Geologiska institutionen

Sammanfattning: Arsenic is present everywhere in the world. It is found in the bedrock and is discharged by industries. Differents forms of arsenic varies in toxicity, the inorganic form is much more toxic then the organic form. The inorganic form is most common in drinking water and groundwater, meanwhile the inorganic form can occasionally be found in reasonable large quantities in fish and seafood. Today millions of people are affected by arsenic. Hu-mans get pigment changes that can lead to skin cancer (arsenic is the only chemical carcinogenic substans that may give skin cancer through intake) and cause other different forms of cancer, for example in the lungs, bladder and liver. Non- carcinogenic effects are diabetes, cardiovascular diseases and damage in the hematopoiesis in the bone marrow. Arsenic is present in ores. In gold, copper and lead ore there can be up to 3 % arsenic. The form of arsenic is depending on oxidation, and is especially affecting the arsenic in the groundwater. Arsenic is bonded to ferric hydroxide, and if the pH is rises, the arsenic will occur in a free form. Arsenic used to be a part in wood preservat-ion, and even if the industrial arsenic has been reduced in recent years, it is still out there in the environment. In a close future this will have to be deposited, and taken care of. But the rate of arsenic as an air pollution has dropped both in Sweden and Europe the last 30 years.

  HÄR KAN DU HÄMTA UPPSATSEN I FULLTEXT. (följ länken till nästa sida)