### بناء أغشية انتقائية سائلة جديدة للتقدير المجهادي لأيوني السترونشيوم (II) والباريوم (II)

#### Abstract

Abstract A Strontium (II) and Barium (II) ion-selective electrode was prepared ; depend on the active material Dibenzo-18-crown-6 (DB18C6) with plasticizer substances Di-n-Octyl phenyl phthalate (DOPP) and Polyurethane (PU) & Poly (vinyl chloride) (PVC) used as matrix carrier. The electrodes which depended on the plasticizer substance DOPP were given a good characteristic to determine the concentration of Sr+2 and Ba+2 ion as a good and specific method, where Strontium electrode in PU matrix were given a linear responsive range at a concentration range (1.00x10-2-5.11x10-7) mol/L , the slope value equal (28.76 mV/decade) the detection limit value are (3.31x10-7) at r = 0.9993 , the pH values equal (3.0-9.0) and the life time (21) days. Where Strontium electrode in PVC matrix were given a linear responsive range at a concentration range (1.00x10-2-6.30x10-7) mol/L , the slope value equal (28.45 mV/decade) , the detection limit value are (4.67x10-7) at r = 0.9985 , the pH values equal (3.0-9.0) and the life time (28) days. Where Barium electrode in PU matrix were given a linear responsive range at a concentration range (1.00x10-2-3.10x10-7) mol/L , the slope value equal (28.55 mV/decade) , the detection limit value are (2.39x10-7) at r = 0.9972 , the pH values equal (3.0-7.0) and the life time (21) days. Where Barium electrode in PVC matrix were given a linear responsive range at a concentration range (1.00x10-2-3.02x10-7) mol/L , the slope value equal (28.26 mV/decade) , the detection limit value are (2.51x10-7) at r = 0.9981 , the pH values equal (3.0-7.0) and the life time (29) days. The selectivity coefficient of the electrode was calculated, in the presence of some interference cations , the effect of using different plasticizers substances was also studied.

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