title: Novel screen-printed electrode for the determination of dodecyltrimethylammonium bromide in water samples.
abstract: The construction and electrochemical response characteristics of a screen-printed electrode (SPE) for the determination of dodecyltrimethylammonium bromide (DTAB) are described. The sensor was based on the use of DTA-tetraphenylborate ion association complex as an electroactive material in screen-printed electrode with dioctylsebacate (DOS) as a solvent mediator. In aqueous solution of pH 3, the sensor displayed a stable response for six months with reproducible potential and linear response for surfactant over the concentration range 1.20 × 10(-2) -5.6 × 10(-7) mol L(-1) at 25 °C with Nernstian slope of 55.95 ± 0.58 mV decade(-1) for detection limit of 6.8 x 10(-6) mol L(-1) . The response time was 6-10 s. The selectivity coefficients indicate excellent selectivity for DTAB over many common cations (e.g. Mg(2+), Na(+), K+, Co(2+), Ni(2+), Ca(2+), Cl(-), I(-), SO(4)(-2) and cetylpyridinium chloride (CPC). The sensor was used successfully for the determining of DTAB in pure form and water samples with average recoveries of 99.98, 98.78, and 99.99%.
authors: Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt. ggenidy@hotmail.com
authors: Gehad G
authors: GG
authors: Mohamed
authors: Tamer Awad
authors: TA
authors: Ali
authors: M F
authors: MF
authors: El-Shahat
authors: M A
authors: MA
authors: Migahed
authors: A M
authors: AM
authors: Al-Sabagh
mesh_terms: D002138:Calibration; D004867:Equipment Design; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes / Q000592:standards; D057230:Limit of Detection; D016014:Linear Models; D011199:Potentiometry / Q000295:instrumentation* / Q000592:standards; D000644:Quaternary Ammonium Compounds / Q000032:analysis*; D012015:Reference Standards; D015203:Reproducibility of Results; D012997:Solvents / Q000737:chemistry; D013501:Surface-Active Agents / Q000032:analysis*; D013696:Temperature; D013775:Tetraphenylborate / Q000737:chemistry; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000644:Quaternary Ammonium Compounds; D012997:Solvents; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D014867:Water; D013775:Tetraphenylborate; C022806:dodecyltrimethylammonium