Ionophore-Based Potentiometric Sensors for the Flow-Injection Determination of Promethazine Hydrochloride in Pharmaceutical Formulations and Human Urine oleh Suad Mustafa Al-Araji, Suham Towfiq Ameen, Marina Mokhtar, Norariza Ahmad, Afidah Abdul Rahim, Rohana Adnan, Ahmed Khudhair Hassan, Sulaiman Ab Ghani, Bahruddin Saad