The New Lead (II) Ion Selective Electrode Based On Free Plasticizer Film of pTHFA Photopolymer

This research has succeeded in developing a Lead (II) –Ion-selective electrode (Pb 2+ -ISE) sensor based on poly-tetrahydro furfuryl acrylate (pTHFA) films free plasticizers utilizing photo-polymer technique. The Pb 2+ -ISE has a performance that includes a linear range of 0.1–10 −5 M, Nernstian number 26.5–29.8 mV/dec and LOD 3.24–3.98 ( × 10 −6 ) M, where the optimum composition between KTpClPB lipophilic salt with leads (IV) ionophore is 1:1 mole ratio. The Pb 2+ -ISE sensor also shows a relatively good selectivity value (Log K pot a,b ) against several interfering ions including K + −6.5 ± 0.3, Na + −6.2 ± 0.1, NH 4 + −6.7 ± 0.1, Mg 2+ −12.7 ± 0.2, Cu 2+ −4.2 ± 0.5 and Cd 2+ −6.1 ± 0.2, where the response of the Pb 2+ -ISE sensor is stable at pH 3–8. In this study, the Pb 2+ -ISE sensor shows validation test results that are comparable to measurements using atomic absorption spectroscopy (AAS) devices using artificial solutions and real sample. The results of testing with artificial solutions successively produced Pb 2+ concentrations of 9.5 ± 0.3, 52.5 ± 1.7, and 100.8 ± 2.5 ppm, while for real samples the Cisadane river was 0.0025 ± 0.45 ppm and the refueling station was 18.15 ± 16.74 mg/kg soil sample.