Quantitative Monitoring of Thulium Ions by a New Thulium Selective Polymeric Membrane Sensor
A new thulium(III) potentiometric sensor based on a membrane containing 2% sodium tetraphenyl borate (NaTPB), 65% dibutylphthalate (DBP), 33% N-(4-acetyl-3-cyano-5-methlfuran-2-yl)acetamide (ACMA), and 30% poly(vinyl chloride) (PVC) has been fabricated. The sensor exhibits a Nernstian response in the concentration range of 1.0 × 10−6 – 1.0 × 10−2 mol L−1 and a detection limit of 6.5 × 10−7 mol L−1. The electrode works well in the pH range of 3.1–9.5 and gives a satisfactory selectivity pattern as compared to most of the alkali, alkaline earth, some transition and heavy metal ions. The proposed Tm(III) sensor was successfully applied to the determination of Tm3+ ion in certified reference materials.
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Document Type: Research Article
Publication date: 01 January 2012
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