Abstract
The first potassium optode based on a protic chromoionophore immobilized in a hydrogel matrix is presented. The highly selective protic chromoionophore consists of a cryptohemispherand moiety and a trinitroanilino chromophore part. The acidifying power of potassium ions over sodium ions is 0.6 pH units. This correlates with the findings in solution. In contrast to several crown and aza-crown based chromophores the highly pre-organized moiety allows ion detection even in aqueous environment. The detection limit for potassium ions at ¶pH 7.7 is 5 μM.
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Received: 30 June 1999 / Revised: 29 February 2000 / Accepted: 4 March 2000
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Krause, C., Werner, T., Huber, C. et al. Hydrophilic sensor membrane based on cation-selective protic chromoionophore. Fresenius J Anal Chem 367, 426–428 (2000). https://doi.org/10.1007/s002160000390
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DOI: https://doi.org/10.1007/s002160000390