The Grainger challenge is a scientific competition to find an economical way to removearsenic from contaminated water. This competition is being funded by the United States National Academy of Engineering and the Grainger Foundation and is meant to help provide safe drinking water to developing countries such as Bangladesh. Water purification is the removal of contaminants from raw water to produce drinking water that is pure enough for human consumption. ... General Name, Symbol, Number arsenic, As, 33 Chemical series metalloids Group, Period, Block 15, 4, p Appearance metallic gray Atomic mass 74. ... Water pollution Pollution is the release of chemical, physical, biological or radioactive contaminants to the environment. ... Drinking water Drinking water is water that is intended to be drunk by humans. ...
External links
Grainger challenge page at the National Academy of Engineering
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