Volume 84 Issue 7 | pp. 83-85
Issue Date: February 13, 2006

Naked-Eye Sensors Detect Anions

Thiourea-based colorimetric sensors recognize biologically important anions in aqueous solution
Department: Science & Technology

All chemists are familiar with the litmus test. Like other acid-base indicators, litmus changes color when the pH of a solution changes. The indicator is an example of a "naked-eye" colorimetric ion sensor. In the presence of hydroxonium ions (H3O+), litmus is red, whereas in alkaline solution it is blue.

Chemists at Trinity College Dublin (TCD) have now developed a family of naked-eye colorimetric anion sensors, which, they say, could potentially be used . . .

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