Abstract
The construction of a salicylate-sensitive tubular potentiometric electrode for flow injection analysis (FIA) is described, in which an ethylene-vinyl acetate (EVA) copolymeric membrane, 40% in vinyl acetate, is applied directly onto a conducting support consisting of a mixture of an epoxy resin and graphite. The tubular salicylate ion-selective electrode is based on tricaprylyl-trimethyl-ammonium (Aliquat™) salicylate as the ion-exchanger, supported on the polymeric matrix without plasticizer solvent. The tubular electrode showed a response of 58.3 mV per concentration decade within the 5.0×10 −3–5.0×10 −1 mol l −1 salicylate range in 0.1 mol l −1 Tris–HCl buffer (pH=7.5). Iodide is the main analytical interferent; the electrode response time was 5 s at 25°C. Determinations of acetylsalicylic acid in tablet samples by the proposed method exhibit relative errors lower than 2%, when compared with a spectrophotometric method. The useful lifetime of the tubular sensor is longer than 3 months.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
