Abstract
The suitability of a xanthone derivative, 1-hydroxy-3-methyl-9 H-xanthen-9-one (HMX) as a neutral ionophore for the preparation of a polyvinylchloride (PVC) membrane electrode for aluminum(III) ions was investigated. The prepared electrode exhibits a Nernstian response for Al 3+ ions over a wide concentration range (1.0 × 10 −6 to 1.6 × 10 −1 M) with a limit of detection 6.0 × 10 −7 M. It has a relatively fast response time and can be used for at least three months without any considerable divergence in potentials. The proposed membrane electrode revealed very good selectivity for Al 3+ ions over a wide variety of other cations and could be used at a working pH range of 3.0–8.5. It was used as an indicator electrode in potentiometric titration of aluminum ions with EDTA and in the determination of Al 3+ in different real samples.
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