Abstract:In this research, new graphite paste electrodes modified with silicon dioxide (SiO2) nano particle are constructed and used for the determination of Viagra drug (Sildenafil citrate, SILC). The electrodes are constructed by preparing ion-pair for (SILC) with phosphotungstic acid (PTA) or phosphomolybdic (PMA) acid using dibutyl phthalate (DBP) as a plasticizer. These electrodes show good sensitivity towards SILC with linear range of (1.0´10-7-1.0´10-2) M, correlation coefficient, (0.9990) and the life time (120… Show more
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