A new thulium(III) membrane sensor composed of 2% sodium tetraphenyl borate (NaTPB), 63% dibutylphthalate (DBP), 5% 1-butyl-3-(2,5-dihydro-4-(3,5-dimethyl-1H-pyrazol-4-yl)-5-oxo-1H-pyrazol-3-yl)thiourea (BT), and 30% poly(vinyl chloride) (PVC) has been developed. It demonstrates a Nernstian
response of 19.6 ± 0.5 mV/decade of thulium concentration. The sensor has a lower detection limit of 68 × 10–7 mol L–1 and it has a linear potential response versus concentration in 1.0 × 10–6 to 1.0 × 10–2
mol L–1 range. The sensor works well in pH range of 3.8–9.2 and reveals a satisfactory selectivity pattern as compared to most of alkali, alkaline earth, some transition and heavy metal ions.
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