Sunday, September 8, 2019
Toxicological Effects of Arsenic and Fate of Arsenic Term Paper - 1
Toxicological Effects of Arsenic and Fate of Arsenic - Term Paper Example The most common arsenic ores are arsenopyrite, orpiment and realgar. These compounds are byproducts of purification and mining of silver metal (Edward, and Carol, 2011). It occurs in group five of the periodic table just below nitrogen and phosphorus. It is classified chemically as a metalloid, having both properties of a metal and non-metal. Arsenic also occurs in a crystalline metallic form which is a steel gray solid and in dark gray amorphous solid. It exists in one of the three oxidation states; -3, Ã ·3, and +5 (Edward, and Carol, 2011). These compounds can be classified as either inorganic or organic. Inorganic arsenic compounds are those without arsenic-carbon bond while organic arsenic compounds are those with an arsenic-carbon bond (Ecclestone, 2010). Global production of arsenic is estimated to be 75,000 tons annually (NAS 1977; EPA 1980) of which almost 97% is used in the manufacture of arsenic trioxide and others are used to manufacture of special lead and copper alloys. Arsenic is used as homeopathic remedies used to cure patients with digestive problems, food poisoning, insomnia, allergies, anxiety, depression and obsessive-compulsive disorder. Arsenic compounds have been used in the manufacture of medicine since the time of Hippocrates (David, 2008); the production of herbicides, desiccants, wood preservatives, and the development of stimulants for plants and animals. Other smaller amounts are used in the manufacture of glass and textiles (Toropova et al., 2011). Arsenic is in constant change and is oxidized, reduced or metabolized and is used in plant uptake or reduction by organisms and chemical processes. These compounds have been used for a long time for the manufacture of medicines ranging from human medicine, plant medicine and also other aquatic organisms. High concentrations of arsenic in the aquatic environment can slow down the growth of aquatic organisms such as fish and invertebrates. Arsenic is very vital in the aeration process of the water (David, 2008).
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