An optimal composition for magnesium liquid membrane sensor based on the reaction of magnesiumions with the macro cyclic reagent 1,4,7 - triazacyclononane - 1,4,7 - tris - methylenemethylphosphinic acid. The characteristics slope ( 30.5 mV), the limit of detection ( 6.2 x 10-7 M), thecoefficient of selectivity toward some metal ions, response time ( 15 s ), lifetime ( 180 days ),the effectof pH on the sensor potential and the basic analytical parameters were studied. The sensor was used toestimate the concentration magnesium ions concentration in pharmaceutical preparations. The obtainedresults by the developed sensor were statistically analyzed and compared with those of other differentreported methods.
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