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Quantitative Analysis of Holmium Ion by a Ho 3+ Ion‐Selective Sensor Based on a Symmetric Thio‐Schiff's Base
Author(s) -
Zamani Hassan Ali,
Fatemeh Rahimi,
Fatemeh NaghaviReyabbi,
Ali Arvinfar,
Alihossien Imani,
Mohammad Reza Ganjali,
Farnoush Faridbod,
Masoud SalavatiNiasari
Publication year - 2011
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201180274
Subject(s) - chemistry , potentiometric titration , holmium , alkali metal , schiff base , inorganic chemistry , ion , thio , electrode , detection limit , metal ions in aqueous solution , potentiometric sensor , titration , ion selective electrode , selectivity , polymer chemistry , chromatography , medicinal chemistry , organic chemistry , laser , physics , optics , catalysis
A poly(vinyl chloride) (PVC) membrane sensor for holmium ions was fabricated based on N ‐[( Z )‐1‐(2‐thienyl)‐ methylidene]‐ N ‐[4‐(4‐{[( Z )‐1‐(2‐thienyl)methylidene]amino} phenoxy)phenyl] amine (TPA) as a new ion carrier, acetophenon (AP) as plasticizing solvent mediator and sodium tetraphenyl borate (NaTPB) as an anion excluder. The electrode shows a good selectivity towards Ho 3+ ions respect to other inorganic cations, including alkali, alkaline earth, transition and heavy metal ions. The constructed sensor displays a Nernstian behavior (19.5±0.3 mV/decade) over the concentration range of 1 . 0×10 −6 to 1 . 0×10 −2 mol·L −1 with the detection limit of the electrode being 4 . 6×10 −7 mol·L −1 and very short response time ( ca . 5 s). It has a useful working pH range of 3.2–9.8 for at least 8 weeks. The electrode was successfully applied as an indicator electrode for the potentiometric titration of a Ho 3+ solution with EDTA and holmium determination in some alloys. The proposed sensor accuracy was studied by the determination of Ho 3+ in mixtures of three different ions.