engleski

INFLUENCE OF NONIONIC SURFACTANTS ON RESPONSE PROPERTIES OF 2-METHYL-1,3- DIOCTADECYL-1H-BENZO[d]IMIDAZOL-3-IUM – BASED SURFACTANT SENSOR

Surfactants, lower the surface tension. There are four main types: anionic (AS), cationic (CS), amphoteric and nonionic (NS). All surfactants consists of a hydrophilic part and hydrophobic part. In commercial cleaning agent formulations, AS are used in combination with NS to enhance the cleaning properties by removing the grease, reducing the foaming and providing the resistance to hard water. The use of NS in combination with AS has a negative impact on detection of AS by potentiometric surfactant sensor based on 2-methyl-1, 3-dioctadecyl-1Hbenzo[d]imidazol-3-ium. The AS dodecyl sulfate (4×10−3 M) was mixed with i) ethoxylated nonionic surfactants (EONSs) with different number of EO groups at fixed concentration ; ii) with EONS containing 10 EO groups at various concentrations ; and titrated with CS cetylpyridinium (4×10−3 M). Increased number of EO groups and incresed concetration of EONS resulted in negative changes in shape, inflexion and signal change of the potentiometric titration curves, making the AS quantification less reliable or even impossible.

Nonionic surfactants, anionic surfactants, sensor, potentiometry

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