| http://www.w3.org/ns/prov#value | - rding to the invention.Theinvention concerns a method for the determination of an ion in an aqueous liquid, in particular a body fluid such as blood, plasma, serum or urine, in which the ion passes into a phase which is immiscible with the aqueous liquid and as a result a pHindicator which is present there undergoes a colour change which is used for the determination of the ion.
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