Issue Date: February 13, 2006
Naked-Eye Sensors Detect Anions
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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