Potentiometric Method for Determining Biologically Non-Degradable Antimicrobial Substances
Russian Journal of Inorganic Chemistry(2023)
摘要
Ion selective electrodes (ISEs) based on polymer plasticized membranes have been developed for the determination of benzalkonium chloride (alkyldimethylbenzylammonium), the active component being cesium bis-octodecyl-2-sulfonio- closo -decaborate Cs[B 10 H 9 S(C 18 H 37 ) 2 ] (sensor A). For the determination of norfloxacin hydrochloride, the active component is potassium tris-octodecyl-1-ammonio- closo -decaborate K[B 10 H 9 N(C 18 H 37 ) 3 ] (sensor B). It has been shown that the electrodes have a reversible potentiometric response with respect to the analyzed cations in the presence of a number of other inorganic and organic cations. The influence of the concentration of the electrode-active substance on the electrochemical characteristics of the manufactured sensor has been studied. The optimal composition of the ion-sensitive membrane has been found. It has been determined that the developed sensors provide a wide range of detectable concentrations (for sensor A, 2 × 10 –7 –1 × 10 –2 ; for sensor B, 1 × 10 –7 –1 × 10 –2 ) and a low detection limit (for sensor A, 1 × 10 –7 M; for sensor B, 8 × 10 –8 M). New ISEs can be recommended for direct potentiometric detection of free ions in water bodies and water extracts of soils.
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关键词
benzalkonium chloride,norfloxacin,ion-selective electrode,polymer membrane,closo-decaborate anion
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