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Abstract: Arsenic contamination in ground water has been reported as natural calamity in the 21st century. It is the twentieth most abundant materials found in earth crust. More than 25 countries are facing its deleterious affect on humans by its ground water contamination which also leads to serious medical symptoms.


The methods utilized in preparations of ceria nanoparticles and its coating on nanotubes is also reviewed.
History of arsenic in field of chemistry, medicine and technology has been completely overshadowed by its role as poison in various homicides. In today's world extension of its similar role has been widely discussed due to world wide ground water contamination and many times referred as 21st century calamity. High concentration of arsenic has been reported from almost 21 countries and among them Bangladesh and West bengal region of India are considered to be the most affected area and significant amount of population are at risk (1). Arsenic is the 20th most abundant material found in earth crust and its concentration in most of rocks ranges between 0.5 to 2.5 mg/kg. Mobilization of arsenic is contributed by various natural phenomenon which include natural weathering reaction, biochemical mobilization, geochemical and volcanic emission etc. but, at many places excessive mining also contributes for the same. Arsenic exist in various oxidation state in natural environment which includes -3,,0.+3. and +5. Figure 1 indicates the Eh-pH diagram of arsenic at 25C.
Long term exposure to arsenic contaminated drinking water have many med ...
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