Read e-book online Environmental health : emerging issues and practice PDF

By Jacques Oosthuizen

ISBN-10: 9533078545

ISBN-13: 9789533078540

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Considering that heavy metals are natural constituents of the Earth's crust, they are present in varying concentrations in all ecosystems and human activities have drastically changedthe biogeochemical cycles and balance of some of these heavy metals. , 1983), etc. Relatively, volatile heavy metals and those that become attached to airborne particles can be widely dispersed on very large scales. org/hms/). The toxicity of these metals has also been documented throughout history: Greek and Roman physicians diagnosed symptoms of acute lead poisoning long before toxicology became a science (Nriagu, (1996).

Mercury has been widely used in consumer products because it is an excellent conductor of electricity and is highly malleable. Products containing mercury include thermometers, dental fillings, fluorescent lamps and other electrical equipment, and some batteries. Mercury is used in several types of instruments common to electric utilities, municipalities and households, such as switches, barometers, meters, temperature gauges, pressure gauges and sprinkler system contacts. It has been used as an ingredient in some pesticides and biocides, certain pharmaceuticals, and cosmetics such as skin lightening creams.

Although dissolved metals are primarily transported in overland flow, some underground transport is possible (Nriagu, 1996). Metals that are introduced to the unsaturated zone and the saturated zone will most likely not be transported a long distance. Dissolved metals that are carried below the land surface will readily sorb to soil particles or lithic material in the unsaturated zone and the saturated zone (Nriagu, 1996). Metals introduced into the atmosphere may be carried to the land surface by precipitation and dry fallout.

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Environmental health : emerging issues and practice by Jacques Oosthuizen

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