Abstract
The performance of a newly synthesized carbosilane dendrimer bearing four triethylene glycol ether (TEG) units, Si(CH2CH2CH2Si(Me)2CH2CH2CH2(OCH2CH2)3Me)4 (1), as ionophores in ion-selective electrodes has been investigated. Optimization of the plasticized polyvinyl chloride membrane composition has produced electrodes that exhibit a Nernstian response for potassium ions. The best general characteristics exhibited by the electrodes were found when the membrane composition ratio of DPE:1:NaTPB:PVC 60:3:2:35 (wt%) was used. The response of the electrode was linear with a Nernstian slope of 58.3 mV/decade over the K+ ion concentration range of 1.9 × 10–7 to 1.0 × 10–1 M with a detection limit of 3.1 × 10–7 M. The response time to achieve a 95% steady potential for the K+ concentration ranging from 1.0 × 10–1 to 1.0 × 10–8 M was less than 10 s, and it was found that the electrode is suitable for use within a pH range of 5.5–8.5. The selectivity coefficients (log KKP o+,tMn+), which were determined by the fixed interference method, showed good selectivity for K+ against most of the interfering cations. The influence of this selective ion-binding behavior using electrospray ionization time-of-flight (ESI-TOF) mass spectrometric studies is discussed.
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Chandra, S., Buschbeck, R. & Lang, H. Triethylene Glycol Ether End-grafted Carbosilane Dendrimer: A Potential Ionophore for Potassium Ion Recognition. ANAL. SCI. 22, 1327–1332 (2006). https://doi.org/10.2116/analsci.22.1327
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DOI: https://doi.org/10.2116/analsci.22.1327