<p>The phenyl-3-methyl-4-benzoyl-5-pyrazolone (HPMBP) synthesized and characterized as ionophore in potentiometric analysis of ion selective electrode method (ISE) with polytetrafluoroethylene (PTFE) as the supporting phase. The pH and concentration of the ionic strength adjuster (ISA) were varied to know at the optimum pH and concentration of the ion-selective electrode (ESI) KNO₃, thus potential Nd³⁺ gives the best performance. Before use the PTFE membrane was immersed

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... a chloroform-HPMBP solution of 1.5-2.0% w/v for 24 h. The pH variation of the buffer solution was adjusted to the pH range of 2-10 using HCl and NaOH solutions, whereas the concentration of KNO₃ varies from 10^-1 to 10^-3 M. The concentration range of Nd³⁺ is between 10^-2 and 10^-7 M. The electrode potential measurement results (E_Nd) obtained the best performance value at pH 4 with KNO₃ concentration of 10^-2 M, sensitivity (S) 18.39 ± 1.2 mV/decade and response time less than 23 s.</p>