Construction of new liquid-selective membranes for the piezometric determination of strontium (II) and barium ions (H)

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.