engleski

New carbon-based surfactant sensor for the determination of anionic surfactants in real samples

Surfactants are widely used in the detergent industry, household and personal care products, textile industry, pharmaceutical industry, biotechnology etc. The estimation is that the surfactant market by the year 2020 will be worth 42, 120 million USD. Usually, anionic surfactants (ASs) are determined by MBAS method which has many disadvantages. The effect of ASs on environment is ambiguous: they have toxic effect on living organisms in water and they can improve the removal of pollutants (inorganic and organic) from the environment, therefore, their determination in low concentrations is very important. A new carbon-based surfactant sensor with dimethyldioctadecylammonium-tetraphenylborate (DDA-TPB) as ionophore exhibited low detection limit of 3, 2·10-7 M for sodium dodecyl sulfate (NaDDS) and 2, 5·10-7 M for sodium dodecylbenzenesulfonate (NaDBS) with the Nernstian response for NaDDS (55.3 mV/decade) and NaDBS (58.5 mV/decade). Comparing to the other surfactant sensors, new carbon-based surfactant sensor showed faster dynamic response, lower noise and smaller drift, longer life and higher potential jump in equivalence point. The new carbon-based sensor exhibited excellent selectivity performance for DS over all of the anions investigated except for DBS, that expectedly exhibited strong interference. It was successfully used as an end-point detector by potentiometric titration of different commercial products and effluents.

anionic surfactants ; carbon-based sensor ; potentiometric determination ; real samples

nije evidentirano