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- W2066224439 abstract "Potentiometric detection employing coated-wire electrodes was applied to the determination of organic acids in liquid chromatography (LC). Poly(vinyl chloride)-based liquid membranes, incorporating lipophilic macrocyclic hexaamines as neutral ionophores were used as electrode coatings. The selectivity and sensitivity of the macrocycle-based electrodes were found to be superior to an electrode based on a lipophilic anion exchanger (a quaternary ammonium salt). Sensitive detection was obtained for the di- and tricarboxylic acids tartaric, malonic, malic, citric, fumaric, succinic, pyruvic, 2-oxoglutaric and maleic acids after separation in reversed-phase LC. Detection limits (signal/4σnoise=3) of 6 pmol for malonic acid and 2 pmol for maleic acid were attained. The detection was explained using a molecular recognition model. The hexaamine-based potentiometric electrodes had a 1-s response time at 1 ml min−1 flow-rates. They were stable for at least 4 months, with an intra-electrode variation of 3.2% (n=5)." @default.
- W2066224439 created "2016-06-24" @default.
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- W2066224439 date "2001-04-01" @default.
- W2066224439 modified "2023-09-27" @default.
- W2066224439 title "Potentiometric detection of organic acids in liquid chromatography using polymeric liquid membrane electrodes incorporating macrocyclic hexaamines" @default.
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- W2066224439 doi "https://doi.org/10.1016/s0021-9673(01)00644-6" @default.
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