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Quality -> Chemical composition -> Micro components -> Arsenic



General characteristics    

Arsenic is in Va group of Periodic table of the elements and belongs in group of semi-metals. Arsenic is grey metal, which makes compounds with many elements like chlorine, oxygen and sulphur forming inorganic arsenic compounds and with hydrogen and carbon forming organic arsenic compounds. Arsenic is finding in nature in shape of sulphide, arsenide and sulpha-arsenide, oxide and arsenate. Arsenic also is finding in copper, lead, zinc, iron, manganese, uranium and gold ores. It used in pyrotechnics, glass industry, ceramics, paints, poison, in medicine, until in last time is using for transistor and laser production.

Origin in water
  

Arsenic is not soluble in water, nut some compounds like arsenite is soluble. Arsenic content is bigger in underground waters then in surface waters, because of natural processes (arsenic presence in geological material) or industrial activity (industrial waste, pesticide and melting processes). There are many regions where arsenic is present in sources of drinking water, mostly in underground waters, in raised concentrations.   Medical aspect   Still is question, does the arsenic essential nutritive material for people, because there are evidences about essential characteristics for people (four kinds of cheese).

Positive effect


It is using in small doses to speed growth.

Negative effect


It is famous by arsenic toxicities. After resorption, arsenic stores in liver, spleen, kidneys and especially in keratin tissues. Organs on which we follow arsenic effects on people are skin, lungs, genital organs, bladder and organ of eyesight. Chronic poising of population, which use drinking waters pollute with arsenic, manifest with skin hyper pigmentation, hyperkeratosis and polyneuritis. These effects bring to insensibility, retch, pain in digestive part of intestine, stopping of blood cells production, accidence of capillaries, abnormal work of heart, nerves, liver and kidneys. Contact of skin and arsenic can bring to burn, itches and skin rash.

Maximal allowable concentrations
  

According to recommendations of EU (Directive 98/83/EC) and according to our rules for drinking water (Sl. list SRJ 42/98), limitary value for arsenic is 10 mg/1.


 






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