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- Title
Potentiometric Surfactant Sensor Based on 1,3-Dihexadecyl-1 H -benzo[ d ]imidazol-3-ium for Anionic Surfactants in Detergents and Household Care Products.
- Authors
Sakač, Nikola; Madunić-Čačić, Dubravka; Marković, Dean; Hok, Lucija; Vianello, Robert; Šarkanj, Bojan; Đurin, Bojan; Hajdek, Krunoslav; Smoljan, Božo; Milardović, Stjepan; Matasović, Brunislav; Jozanović, Marija
- Abstract
A 1,3-dihexadecyl-1H-benzo[d]imidazol-3-ium-tetraphenylborate (DHBI-TPB) ion-pair implemented in DHBI-TPB surfactant sensor was used for the potentiometric quantification of anionic surfactants in detergents and commercial household care products. The DHBI-TPB ion-pair was characterized by FTIR spectroscopy and computational analysis which revealed a crucial contribution of the C–H∙∙∙π contacts for the optimal complex formation. The DHBI-TPB sensor potentiometric response showed excellent analytical properties and Nernstian slope for SDS (60.1 mV/decade) with LOD 3.2 × 10−7 M; and DBS (58.4 mV/decade) with LOD 6.1 × 10−7 M was obtained. The sensor possesses exceptional resistance to different organic and inorganic interferences in broad pH (2–10) range. DMIC used as a titrant demonstrated superior analytical performances for potentiometric titrations of SDS, compared to other tested cationic surfactants (DMIC > CTAB > CPC > Hyamine 1622). The combination of DHBI-TPB sensor and DMIC was successfully employed to perform titrations of the highly soluble alkane sulfonate homologues. Nonionic surfactants (increased concentration and number of EO groups) had a negative impact on anionic surfactant titration curves and a signal change. The DHBI-TPB sensor was effectively employed for the determination of technical grade anionic surfactants presenting the recoveries from 99.5 to 101.3%. The sensor was applied on twelve powered samples as well as liquid-gel and handwashing home care detergents containing anionic surfactants. The obtained results showed good agreement compared to the outcomes measured by ISE surfactant sensor and a two-phase titration method. The developed DHBI-TPB surfactant sensor could be used for quality control in industry and has great potential in environmental monitoring.
- Subjects
POTENTIOMETRY; HOME furnishings; ANIONIC surfactants; CATIONIC surfactants; SURFACE active agents; NONIONIC surfactants; DETERGENTS; FOURIER transform infrared spectroscopy
- Publication
Molecules, 2021, Vol 26, Issue 12, p3627
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules26123627