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TECHFIND - SENSORS
Arsenic Testing with Nanoparticles
Researchers at a U.S. southern university have developed a new approach for a rapid, easy, and highly sensitive arsenic test. Current techniques for analyzing arsenic concentrations in drinking water are time consuming and require a series of enrichment steps. The new method involves attaching special organic molecules to the surface of gold nanoparticles, which then act as "ligands" for arsenic, meaning they form a complex with it. The gold particles clump together, with the number of aggregates based on the arsenic concentration in the water. The color of the gold nanoparticles in a liquid depends on their size, with the arsenic-free gold nanoparticles appearing red and arsenic-induced aggregation causing the color to change to blue. The method can detect arsenic in drinking water down to concentrations of three parts per trillion.
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Researchers at a U.S. southern university have developed a new approach for a rapid, easy, and highly sensitive arsenic test. Current techniques for analyzing arsenic concentrations in drinking water are time consuming and require a series of enrichment steps. The new method involves attaching special organic molecules to the surface of gold nanoparticles, which then act as "ligands" for arsenic, meaning they form a complex with it. The gold particles clump together, with the number of aggregates based on the arsenic concentration in the water. The color of the gold nanoparticles in a liquid depends on their size, with the arsenic-free gold nanoparticles appearing red and arsenic-induced aggregation causing the color to change to blue. The method can detect arsenic in drinking water down to concentrations of three parts per trillion.
