Naslov
Potentiometric Determination Of Nonionic And Cationic Surfactants In Cleaning And Disinfecting Agents By New High Sensitive NS-Sensor

Autori
Madunić-Čačić, Dubravka ; Sakač, Nikola ; Jozanović, Marija

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
2nd European Sample Preparation and 1st Green and Sustainable Analytical Chemistry e-Conferences / Psillakis, Elefteria ; Cordero, Chiara - , 2022, 40-40

Skup
2nd European Sample Preparation and 1st Green and Sustainable Analytical Chemistry

Mjesto i datum
Online, 14.04.2022. - 16.04.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Nonionic surfactants, Potentiometric sensor, Pseudo-cationic complex, COVID-19 pandemic, Disinfecting agent
(nonionic surfactants, potentiometric sensor, pseudo-cationic complex, COVID-19 pandemic, disinfecting agent)

Sažetak
Nonionic surfactants are, after anionics, the second most commonly used surfactants in detergents and personal care products. At the time of the COVID-19 pandemic, it increased further due to the growing demand for cleaning and disinfecting agents. The reason for this is their compatibility with cationic surfactants used in these agents as disinfectant. In this investigation a new sensor for polethoxylated non-ionic surfactants (EONS) determination, based on hexadecyltrioctadecylammonium-tetraphenylborate (HTA-TPB) ion pair has been developed. HTA-TPB ion-pair was originally used as electroactive material in anionic surfactants sensitive potentiometric sensor [1]. Due to its good features, the same ionophore was tested as electroactive material in new PVC-based liquid membrane electrode for nonionic surfactants determination (HTA-TPB NS-sensor). Bis(2- ethylhexyl) phthalate, which has been shown to be good as a plasticizer for NS-sensors [2] was used as a membrane plasticizer for this new sensor. The main application of the sensor was indication of the end-point in potentiometric titration of EONS in the form of barium pseudo-cationic complex using sodium tetraphenylborate (c = 0, 005 mol/L) as titrant. The HTA-TPB NS-sensor was successfully used for the potentiometric titration of Triton X- 100 and several other EONS of varying degrees of ethoxylation (7 to 25 EO groups), and some model solutions and commercial samples. Several samples of cleaning and disinfecting agents available on the market at this time of the COVID-19 pandemic were analyzed. In addition to nonionic, cationic surfactant were also determined [sensor with response on pseudo-cationic surfactant (Ba2+ - ethoxylate) also has a response on cationic surfactant]. The same titrant is used for their titrations [3]. In the first titration performed directly in aqueous solution, the cationic surfactant is determined. In the second titration, which is performed with the addition of barium chloride solution before titration, cationic and nonionic surfactants are are titrated together in one titration, first cationic and then nonionic. Then the nonionic surfactant content should be calculated from the difference in consumptions in these two titrations. The results for non-ionic surfactants were compared with those obtained using standard ion- exchange extraction method. The results for cationic surfactants were compared with results obtaines in two-phase titration [4]. In all cases results showed high correlation with results obtained with method used as a reference one.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Interdisciplinarne tehničke znanosti

POVEZANOST RADA