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Colour change test for arsenic

by Lewis Brindley, RSC last modified 11-30-09 08:02 AM Copyright 2009, RSC
Colour change test for arsenic

The colour change can be seen when arsenic is present as opposed to other metal ions (top), and at different arsenic concentrations (bottom) © Angew. Chem. Int. Ed.

US researchers have developed a test to quickly and accurately measure arsenic levels in drinking water down to very low concentrations. The test uses a solution of gold nanoparticles that changes colour in the presence of the toxic metal. It is hoped that the research will simplify the task of mapping out hotspots of arsenic contamination across the world.  More...

http://www.rsc.org/chemistryworld/News/2009/November/30110901.asp

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