Heavy Metals And Its Effects

3249 WordsNov 10, 201413 Pages
1. Introduction Heavy metals and their salts (Cu, Zn, Hg, Pb, Co, Ni,) are widespread industrial pollutants. In the waters they come from natural sources (rocks, the surface layers of soil and groundwater), the wastewater of many industrial enterprises and rain (polluted with smoke emissions). Heavy metals, as trace elements, are constantly encountered in natural waters and aquatic bodies depending on the geochemical conditions. Heavy metals are quite stable and cannot be destroyed. Entering the ponds, they are included in the cycling of matter and subjected to various transformations. Inorganic compounds are rapidly solubilized in water and transferred into poorly soluble hydroxides, carbonates, sulfides and phosphates. Later, these insoluble products settle down and contaminate the bottom sediments. Under the influence of living organisms (bacteria, fungi and others) mercury, tin, and arsenic undergo methylation, becoming more toxic alkyl compound. Moreover, metals can be accumulated in various organisms and incorporated in the food chain and cause poisoning. This project focuses on the elimination of cobalt (II) metal ions from contaminated waters. Even though Co (II) appears to be one of the essential elements to human body at low concentrations, when cobalt is too concentrated; it may damage human body and may cause diseases such as asthma and pneumonia1. Cobalt pollution may be caused by many alloys (super alloys in gas turbine of aircraft engines, corrosion resistant
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