A liquid cephalexin hydrochloride-sensors relied upon the ion pair of cephalexin hydrochloride(CEX) with phosphotungstic acid(PTA) are set up .The electrode shows a Nernstian slope 29.10 and 27.20 mV/decade for terminals relied upon NPOE and DOPH as a plasticizers in PVC lattice ,separately. Concentration extend were from 1.0×10-5 to 1.0×10-2 M for the two cathodes, the constraint of discovery were 6.5×10-6 and 4.0×10-6 M, separately. Relationship coefficient were 0.9994 and 0.9995 ,individually. Life time were 35 and 33 days ,separately ,additionally impact of PH were read for the two terminals. The new electrodes show great insight of cephalexin hydrochloride starting at various inorganic particles. The properties of the electrodes license it to exist utilized emphatically to assessment cephalexin hydrochloride stylish its medication plans.
Key words: ion selective electrode, liquid membrane, PVC sensor, phosphotungstic acid, cephalexin hydrochloride.