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We report a new type of remote optical sensor of metal ions in solution based on fluorescence lifetime quenching due to dipole-dipole energy transfer across a polymer-water interface. Ion selectivity is provided by spectral overlap between the sensor fluorescence and metal ion absorption. The sensor is demonstrated in the detection of cobalt ions in water at levels down to 17 mu g.
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Birch et al. (1995) studied this question.
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