engleski

Development of a new potentiometric sensor for detection of anionic surfactants

Surfactants are chemical compounds with the ability to decrease the surface tension of a solvent. In the year 2012 the value of world production of surfactants amounted to 27.040 million, an increase of 6.18 % is expected by the year 2017. Standard method for the determination of anionic surfactants (ASs) is MBAS method. Because of the many shortcomings of MBAS method, there is a constant need to develop sensors that are cheaper and easier to use, and potentiometric sensors in this area are widely applied. A novel potentiometric sensor based on new complex ion pair dimethyldioctadecylammonium-tetraphenylborate (DDA-TPB) is developed. New sensor is sensitive, accurate, selective, rapid, simple and inexpensive. Sensor exhibited a Nernstian response for sodium dodecyl sulfate (NaDDS, 59.0 mV/decade) and sodium dodecylbenzene sulfonate (NaDBS, 59.1 mV/decade) over the range of 3•10^-7 to 8•10^-3 M for NaDDS and 4•10^ -7 to 2•10^-3 M for NaDBS. Different pH values, ionic strengths and commonly used nonionic surfactants, organic anions and inorganic anions did not have a significant influence on the sensor performances or the accuracy of ASs determination).

anionic surfactants; potentiometric sensor

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