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  • 1
    Electronic Resource
    Electronic Resource
    New method for determining the concentration of ionic impurities in solvent polymeric membranes (1995)
    Springer
    Microchimica acta 121 (1995), S. 269-279 
    Details
    ISSN: 1436-5073
    Keywords: ionic sites ; PVC ; Tecoflex® ; ion-selective electrodes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new method is proposed for ascertaining the amount of ionic impurities in solvent polymeric membranes of ion-selective electrodes. The method is based on determining the selectivity coefficient for ions of different valences as a function of the concentration of a lipophilized tetraphenylborate salt added to the membrane phase. Thus, the concentration of anionic impurities in commercially available poly(vinyl chloride) and of cationic ones in Tecoflex® (a polyurethane) was obtained as 0.063 ± 0.016 and 0.044 ± 0.006 mmol/kg, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01248256
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