Electrochemical analysis of response behavior of silver selective electrode based on triazine derivatives

The study concerned with the development and construction of three potentiometric sensors selective for Ag + depends on incorporation of some insecticides compounds derivatives of triazine; such as (Diniconazole (DC) (I), Ametryn (AM) (II), Prometryn( PM) (III)) in the membrane and forming relative complexes by conditioning these sensors in Ag + solution. These sensors showed very good sensitivity and selectivity toward Ag (I) with good Nernstian slopes 56.7±0.2, 48.7±0.1, 55.0±0.8 mV/decade with lower limit of detections 5.75.0X10 -6 , 5.3.0X10 -6 , 3.5.0X10 -6 M in pH range 3.5-7, 4.5-8, 4-8 over the concentration range 10 -5 -10 -2 M respectively, all the factors which affected on the sensitivity and selectivity of these sensors were studied, such as the percentage of ionophore in the membrane, the effect of solvent mediator, the concentration of internal solution, PVC derivatives and pH media. The comparison between the three sensors are evaluated, from the results obtained, it was found that the more selective one is the sensor (I) which has the Nernstian slope 56.7 mV/decade, the lowest detection limits 5.75x10 -6 M and fast response time less than 10 sec. All the proposed sensors are used for detection and determination of silver ion in its solution by direct potentiometric measurement technique with 0.1 M NaCl and gave a sharp inflection points.