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1-Hydroxy-3,6,8-pyrenetrisulfonate (HPTS), covalently immobilized on cellulose attached to a plastic strip, has been used as a fluorescent optical pH sensor for the neutral pH region. At near neutral pH, HPTS fluoresces green, i.e., from its conjugate base form, exclusively and independent of whether it was excited in its conjugate base form or acidic (phenol) form, or both. However, the fluorescence...
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