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The first application of a lipophilic polarity-sensitive dye (PSD) to optically sense an anion is reported. A membrane responsive to nitrate has been developed which is composed of plasticized poly(vinyl chloride), an anion “carrier” (tridodecylmethylammonium chloride), and a lipophilic cationic PSD (rhodamine B octadecyl ester perchlorate). On exposure to nitrate, the fluorescence intensity increases,...
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