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Nanomaterials

Nanomaterials

Nanoparticle sensors detect arsenic in drinking water

29 Mar 2021 Tami Freeman
Arsenic sensor
In clean water (left), the gold nanoparticles are in a dispersed state and are red in colour; when salt is added, they remain dispersed. In arsenic-contaminated water (right), the addition of salt causes the nanoparticles to aggregate and change colour to blue. (Courtesy: Muhammad Abbas)
“About 785 million people are living without access to safe and clean drinking water; 140 million

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Tami Freeman is an online editor for Physics World
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