Abstract
A new aluminium (III) polymeric membrane electrode containing (E)-N′-(4-(dimetlylamino)benzylidene)-1H-benzo[d]midazobe-2-hydrazide (L) as a carrier has been prepared. The influence of membrane ingredients including ionophore, PVC, plasticizers and anionic excluders (NaTPB and KTpClPB) on the electrode response has been investigated. The best performance was obtained with a membrane composition of carrier L:DBP:PVC ratio of 1.00:65.99:33.01 (%, w/w). The sensor exhibited a Nernstian response for Al3+ ion ranging from 1.0×10−7 to 1.0×10−1M with a detection limit of 5.6×10−8M and a slope of 20.7mV/decade. It showed a relatively fast response time (10s), suitable reproducibility and stability, and good selectivity towards Al3+ ion. The prepared electrode was used as an indicator electrode in potentiometric titration of Al3+ with EDTA and in the determination of Al3+ ion in waste water and vermicelli.
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