title: Fabrication of a highly selective cadmium (II) sensor based on 1,13-bis(8-quinolyl)-1,4,7,10,13-pentaoxatridecane as a supramolecular ionophore.
abstract: A new cadmium (II) ion selective sensor based on 1,13-bis(8-quinolyl)-1,4,7,10,13-pentaoxatridecane (kryptofix5) as a supramolecular carrier has been developed. The membrane solutions containing polyvinyl chloride (PVC), plasticizer, sodium tetraphenylborate (NaTPB) as a lipophilic ionic additive and kryptofix5 as an ionophore were directly coated on the surface of graphite rods. The best composition of the coated membrane (w/w%) was found to be: 30.0% PVC, 61.0% dioctyl sebacate (DOS), 6.0% NaTPB and 3.0% kryptofix5. The sensor indicates a good linear response for Cd(2+) cation over a wide concentration range from 1.0×10(-5) to 1.0×10(-1) M with a Nernstian slope of 29.8±0.1 mV/decade and the detection limit is 8.4×10(-6) M. The response time of the sensor is 15s and it can be used for 7 weeks without significant drift in potential. The sensor operates in the wide pH range of 1.0-6.0. This sensor reveals a very good selectivity toward Cd(2+) ion over a wide range of alkali, transition and heavy metal cations. The sensor was used as an indicator electrode for potentiometric titration of Cd(2+) using sodium fluoride and ethylenediaminetetraacetic acid (EDTA) solutions with a sharp potential change that occurred at the end point. In addition, the proposed sensor was successfully used for determination of Cd(2+) cation in real water samples.
authors.affiliation: Department of Chemistry, khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran. Electronic address: arezooghaemi@yahoo.com.
authors.forename: Arezoo
authors.initials: A
authors.lastname: Ghaemi
authors.affiliation: Department of Chemistry, khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran.
authors.forename: Haman
authors.initials: H
authors.lastname: Tavakkoli
authors.affiliation: Department of Chemistry, khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran.
authors.forename: Tayebeh
authors.initials: T
authors.lastname: Mombeni
mesh_terms: D000473:Alkanes / Q000138:chemical synthesis* / Q000737:chemistry*; D002104:Cadmium / Q000032:analysis*; D002138:Calibration; D002412:Cations; D006863:Hydrogen-Ion Concentration; D007476:Ionophores / Q000138:chemical synthesis* / Q000737:chemistry*; D008567:Membranes, Artificial; D011092:Polyethylene Glycols / Q000138:chemical synthesis* / Q000737:chemistry*; D011199:Potentiometry; D011804:Quinolines / Q000138:chemical synthesis* / Q000737:chemistry*; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: C000593036:1,13-bis(8-quinolyl)-1,4,7,10,13-pentaoxatridecane; D000473:Alkanes; D002412:Cations; D007476:Ionophores; D008567:Membranes, Artificial; D011804:Quinolines; D014874:Water Pollutants, Chemical; D002104:Cadmium; D011092:Polyethylene Glycols; C094074:tridecane
keywords: Cd(2+) ion-selective sensor; Coated graphite electrode; Kryptofix5; Potentiometry