Abstract
A fibre optic potassium ion sensor has been developed based on reflectance measurements of the pH-dependent chromogenic crown ether ‘Takagi reagent’ immobilized on the non-ionic polymeric resin Amberlite XAD2. The sensor response is in the 1.5–100 mM range with a detection limit of 0.25 mM K +. The selectivity factor over sodium is 20. The proposed sensor works with a reproducibility of ± 0.8% at the 5 mM K + level. Advantageous design features include ease of construction, simplicity of use, reversibility, short response time ( $ ̃ 1 min) and an optimum working pH range (7.0–8.0) for biological fluids. This optical sensor was applied successfully to the direct determination of potassium in human serum. Aqueous potassium standards containing 0.13 M NaCl and a buffer of pH 8 were used for calibration.
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