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Chemical extraction analysis reveals high lithium cation selectivity using a phenolic cryptand chromoionophore at neutral pH, suggesting utility for optical metal sensing.
Chloroform solutions of the chromoionophore 4c, which has been synthesised by a simple procedure from diaza-15-crown-5 2a, extract lithium cations from aqueous solutions in the pH range 7–8 with very high selectivity as compared with the extraction of sodium, potassium, magnesium and calcium; the related reagent 5 shows moderate selectivity for sodium.
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Sholl et al. (1992) studied this question.
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