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In this research, a new modified carbon paste electrode (CPE) including multi-walled carbon nanotube (MWCNT) and nanosilica (NS) and 4-Hydroxy Salophen (HS) as a suitable ionophore was constructed and applicated as Tm 3+ -ion selective sensor. This electrode shows a Nernstian response (19.20.1 mV/decade) over concentration range of 1.0×10 −8 to 1.0×10 −3 mol L -1 . The electrode detection limits was found to be 9.0×10 −9 mol L -1 at a pH range of 3.1–7.8. The sensor has a response time of ~14 s. This electrode displays very good selectivity with respect to different interfering ions, including alkali, alkaline earth, transition and heavy metal ions. The created sensor was satisfactory applied to determine Tm 3+ ions in presence of metal ions mixture and used as an indicator electrode in the potentiometric titration of Tm 3+ ions with EDTA.

Fabrication of a New Modified Tm3+- Carbon Paste Sensor Using Multi-Walled Carbon Nanotubes (MWCNTs) and Nanosilica Based on 4-Hydroxy Salophen