engleski

Potentiometric Surfactant Sensor for Anionic Surfactants Based on 1,3-dioctadecyl-1H-imidazol-3-ium tetraphenylborate

As anionic surfactants are used in detergents for cleaning and washing, they pose an environmental and health hazard. A novel potentiometric sensor for anionic surfactants based on the 1, 3- dioctadecyl-1H-imidazol-3-ium tetraphenylborate (DOI-TPB) ionophore is presented. The newly developed approach to DOI-TPB synthesis is faster and simpler than currently used strategies and fol-lows the green chemistry principles. DOI-TPB ionophore was characterized by computational and in-strumental techniques (NMR, LC-MS, FTIR, elemental analysis), and used to produce a PVC- based DOI-TPB sensor. The sensor showed linear response to dodecylbenzenesulfonate and dodecyl sulfate in concentration ranges of 6.3 x 10-7 – 3.2 x 10-4 M and 5.9 x 10-7 – 4.1 x 10-3 M, for DBS and SDS, re-spectively. The sensor shows Nernstian slope (59.3 mV/decade and 58.3 mV/decade for DBS and SDS, respectively), and low detection limits (7.1 x 10-7 M and 6.8 x 10-7 M for DBS and SDS, respectively). DOI-TPB sensor was successfully tested on real samples of commercial detergents and the results were in agreement with the referent methods. Computational analysis underlined the importance of long al-kyl chains in DOI+ and their C–H∙∙∙π interactions with TPB– for the ionophore formation in solution, thereby providing guidelines for the future design of efficient potentiometric sensors.

anionic surfactants ; computational analysis ; green chemistry ; quaternary ammonium compounds ; synthetic ionophore ; potentiometric sensor

nije evidentirano