Application of 1-ethyl-3-(2,5-dihydro-4-(3,5-dimethyl-1H-pyrazol-4-yl)-5-oxo-1H-pyrazol -3-yl)thiourea as sensing material for construction of Tm3+-PVC membrane sensor

作者：Zamani Hassan Ali^*; Feizyzadeh Babak; Faridbod Farnoush; Ganjali Mohammad Reza

来源：Materials Science and Engineering: C , 2011, 31(7): 1379-1382.

DOI：10.1016/j.msec.2011.05.004

• Sensor
• PVC membrane
• Potentiometry
• Ion-selective electrode

A thulium(III) membrane sensor was made using 2% sodium tetraphenyl borate (NaTPB), 65% dibutylphthalate (DBP), 30% poly(vinyl chloride) (PVC) and 3% 1-ethyl-3-(2,5-dihydro-4-(3,5-dimethyl-1H-pyrazol-4-yl)5-oxo-1H-pyrazol-3-yl)thiourea (ET) as an ionophore. Conductometric study shows selectivity of the Et toward Tm3+ ions. Nemstian response of 19.6 +/- 0.4 mV per decade of thulium concentration was observed. and the electrode worked well in concentration range of 1.0 x 10(-6) to 1.0 x 10(-2) mol L-1 with a lower detection limit (LDL) of 7.2x 10(-7) mol L-1, in a pH range of 4.3-10.4. The selectivity of the sensor over alkaline, alkaline earth, transition and heavy metal ions was also found to be in a satisfactory range. To check the analytical applicability of the proposed Tm3+ sensor, it was successfully used as an indicator electrode in analysis of thulium in certified reference materials.

• 出版日期2011-10-10