A NEW SEPIOLITE CLAY/TiO2/MULTIWALL CARBON NANOTUBE MODIFIED CARBON PASTE SENSOR FOR THE ADSORPTIVE STRIPPING SQUARE WAVE VOLTAMMETRIC ANALYSIS OF VANILLIN IN LOCAL FOOD SAMPLES

Erden S., YAZAN Z.

REVUE ROUMAINE DE CHIMIE, cilt.63, sa.11, ss.977-986, 2018 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 63 Sayı: 11
  • Basım Tarihi: 2018
  • Dergi Adı: REVUE ROUMAINE DE CHIMIE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.977-986
  • Anahtar Kelimeler: vanillin, sepiolite clay, TiO2 nanoparticles, multiwall carbon nanotube, carbon paste electrode, ELECTROCHEMICAL SENSOR, GRAPHENE OXIDE, ELECTROCATALYTIC OXIDATION, MODIFIED ELECTRODES, COMPOSITE, PERFORMANCE, BEHAVIOR
  • Ankara Üniversitesi Adresli: Evet

Özet

A new composite electrode comprising sepiolite clay/TiO2/multiwall carbon nanotube and carbon paste (SC/TiO2/ MWCNT/CPE) was developed and used for the voltammetric quantitative analysis of vanillin (VAN) in processed food. Adsorptive stripping square wave voltammetric (AdsSWV) method was employed. The effects of pH, ratios of electrode ingredients, accumulation potential and accumulation time were investigated. The electrode exhibited a good linear working range of 3.0x10(-7) - 9.0x10(-5) molL(-1) and a detection limit of 2.3x10(-8) molL(-1) for VAN compared to the other modified electrodes. The sensitivity and selectivity in the presence of glucose, ascorbic acid, citric acid, Na+, Ca2+, Mg2+, Al3+, K+, Fe2+, Cu2+, Zn2+, pb(2+) Cl-, and NO3- were found to be satisfactory. The electrode system developed has a lifetime not shorter than 2 months and proved to be practical for the analysis of real samples. The percent repeatability and reproducibility of voltammetric currents are 2.55% and 2.94% respectively at a VAN concentration of 1.0x10(-5) molL(-1).