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- W2063486880 abstract "A novel potentiometric membrane sensor for potassium ion based on the use of rifamycin as a neutral ionophore is described. The sensing membrane is formulated with 2 wt.% rifamycin-SV, 69 wt.% dibutylsebacate plasticizer and 29 wt.% PVC. Linear and stable potential response with near-Nernstian slope of 56.7 ± 0.2 mV decade−1 are obtained over the concentration range 1 × 10−1−3 × 10−5 M K+. The detection limit is 0.3 μg ml−1 K+, the response time is 10–30 s and the working pH range is 4–11. Responses of the sensor toward alkali and alkaline earth metal ions are in the order K+ > Rb+ > Cs+ > Na+ > NH4+ > Ba2+ > Mg2+ > Ca2+ > Sr2+ > Li+. The selectivity coefficient data reveal negligible interference from transition metal ions. Direct potentiometric determination of K+ in the presence of 10–50-fold excess of alkali and alkaline earth metals gives results with an average recovery of 99.1%, and a mean standard deviation of 1.2%. The data agree fairly well with those obtained by flame photometry." @default.
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- W2063486880 date "1997-06-01" @default.
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- W2063486880 title "A novel potassium ion membrane sensor based on rifamycin neutral ionophore" @default.
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- W2063486880 doi "https://doi.org/10.1016/s0039-9140(96)02199-6" @default.
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