The most common heavy metals that form organic compounds that are complex are such as oxygen, sulfur and nitrogen.Classification of heavy metals is done depending on which class it lies. For example class A belong to the hard metals, class be identifies soft metals and lastly we have the intermediate metals. Heavy metals such as Mercury, Lead and cadmium fall under class B which represents soft metals. On the other hand chromium is an intermediate metal. The classification of these metals varies depending on their chemical formula.Through causes that are both anthropogenic and natural, heavy metals find their way into the environment. The major emission causes are human sources such as mining operations. Heavy metals are exposed into the environment in forms that are both inorganic and organic. Anthropogenic sources of emissions occur from both point and non-point sources such as industrial areas such as present and previous sites of mining, smelters and foundries and by-products and traffics combustion.The pollution of the environment by heavy metals is acute in mining locations and it decreases as the distance widens from those mining sites. The heavy metals are often leached into the soil and ground water. Those in sloppy areas find their way into the water bodies through surface runoff. The heavy metals eventually attach themselves to the sediments whilst some leak into the waters underground resulting to their contamination.Underground and surface water sources heavy metal contamination leads to soil pollution. Exposure of the heavy metals to air and rain is via dumping on the surface soil. Pollution of Agricultural soils results to the uptake of the heavy metals by plants resulting to their accumulation in the plant tissues. These consequently happen to those marine animals and domestic animals that feed on the contaminated plants resulting to the accumulation of the heavy metals in their body tissues. Human beings are vulnerable to heavy metal pollution. This is due to their consumption of plants and animals that are contaminated. This subsequently results to biochemical disorders. In conclusion, all biota’s get contaminated along their food chain cycles. Human beings at home get contaminated via utilization of industrial products made from heavy metals. Disinfectants, organo-metallics, anti-fungal agents, creams and toiletries expose an individual to Mercury, whereas artist paints and
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