engleski

The application of nanomaterials in construction of electrochemical sensors

MWCNT was used as a conducting substrate at construction of an all solid contact anionic surfactant sensor which used 1, 3-didecyl-2-methylimidazolium-tetraphenylborate (DMI-TPB) ion pair as the sensing element implemented in PVC membrane. SEM was used for morphological characterization of the sensor. The detection limits for DS and DBS were 1, 2 · 10-7 and 2, 6 ·10-7 M, respectively. The sensor revealed a stable potentiometric response in a pH range between 3 and 13 with a signal drift of 1, 9 mV/hour, and exhibited outstanding selectivity performances for DS toward the majority of organic and inorganic anions most frequently employed in commercial formulations based on surfactants. The new sensor was applied for the end-point location at potentiometric anionic surfactant titrations. The sensor was tested at determination of ASs in commercial detergent products and the results were compared with those obtained with the standard two-phase titration method exhibiting the satisfactory mutual agreement.

surfactant sensor, MWCNT, anionic surfactant, potentiometric titration

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