Two Novelties in Ion‐pair Formation‐based Potentiometric Titrations of Anionic Surfactants

Mikýsek, Tomáš; Stočes, Matěj; Vytřas, Karel

doi:10.1002/elan.201600231

Cited by 4 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The titration of ionic surfactants is based on the reaction of two oppositely charged large lipophilic ions resulting in the formation of a sparingly soluble ion-associate that becomes extractable into the membrane. Mikysek et al reported on a low resistive (10 Ω) coated-wire ion-selective electrode for the potentiometric detection of anionic surfactants . The electrode was prepared by dipping an Al conductor into a homogenized mixture of the graphite powder, PVC, and NPOE in THF.…”

Section: Analytical Applications and Methodologiesmentioning

confidence: 99%

“…Mikysek et al reported on a low resistive (10 Ω) coated-wire ion-selective electrode for the potentiometric detection of anionic surfactants. 185 The electrode was prepared by dipping an Al conductor into a homogenized mixture of the graphite powder, PVC, and NPOE in THF. In this work, didecyldimethylammonium chloride was used as a cationic titrant to provide titration curves with a larger potential jump than ones obtained with conventionally used titrants.…”

Section: Analytical Chemistrymentioning

confidence: 99%

See 1 more Smart Citation

Potentiometric Sensing

2018

View full text Add to dashboard Cite

Section: Analytical Applications and Methodologiesmentioning

confidence: 99%

Section: Analytical Chemistrymentioning

confidence: 99%

Potentiometric Sensing

2018

View full text Add to dashboard Cite

“…Ion pairing of cationic surfactants with anionic ones is generally known and practically used for their titration with potentiometric indication, which enables us to determine their total contents [ 21 ]. Here, a two-stage accumulation performed ex-situ was used to modify the CPE surface with a double layer of mutually paired surfactants.…”

Section: Resultsmentioning

confidence: 99%

Carbon Paste Electrodes Surface-Modified with Surfactants: Principles of Surface Interactions at the Interface between Two Immiscible Liquid Phases

Švancara,

Sýs

2023

Sensors

View full text Add to dashboard Cite

Carbon paste electrodes ex-situ modified with different surfactants were studied using cyclic voltammetry with two model redox couples, namely hexaammineruthenium (II)/(III) and hexacyanoferrate (II)/(III), in 0.1 mol L−1 acetate buffer (pH 4), 0.1 mol L−1 phosphate buffer (pH 7), and 0.1 mol L−1 ammonia buffer (pH 9) at a scan rate ranging from 50 to 500 mV s−1. Distinct effects of pH, ionic strength, and the composition of supporting media, as well as of the amount of surfactant and its accumulation at the electrode surface, could be observed and found reflected in changes of double-layer capacitance and electrode kinetics. It has been proved that, at the two-phase interface, the presence of surfactants results in elctrostatic interactions that dominate in the transfer of model substances, possibly accompanied also by the effect of erosion at the carbon paste surface. The individual findings depend on the configurations investigated, which are also illustrated on numerous schemes of the actual microstructure at the respective electrode surface. Finally, principal observations and results are highlighted and discussed with respect to the future development and possible applications of sensors based on surfactant-modified composited electrodes.

show abstract

“…Equations ( 1) and ( 2) represent the DAC 2+ /Na + -exchange reaction and the expression for the exchange coefficient, respectively. These equations are analogous to the well-known extraction equilibria and extraction constants utilized in conventional titrations based on ion pair formation [27,28].…”

Section: Complexometric Potentiometric Titration and Response Mechanismmentioning

confidence: 97%

Ionophore-Based Nanosphere Emulsion Incorporating Ion-Exchanger for Picogram Potentiometric Determination of HCV Drug (Daclatasvir) in Pharmaceutical Formulations and Body Fluids

et al. 2023

View full text Add to dashboard Cite

Daclatasvir dihydrochloride (DAC) is a drug used to treat hepatitis C virus (HCV) infection. In this study, an ionophore-based nanosphere emulsion was made of tricresyl phosphate (TCP) as the oil phase that is dispersed in water using Pluronic F-127 as an emulsifying agent. The nanospheres, consisting of the oil phase TCP, were doped with sodium tetraphenyl borate (Na-TPB) as a cation-exchanger and dibenzo-18-Crown-6 (DB18C6) as an ionophore (chelating agent) for DAC. The nanosphere emulsion was employed as a titrant in the complexometric titration of DAC (the analyte), and the DAC-selective electrode (ISE) was used as an indicator electrode to detect the endpoint. In the sample solution, DAC2+ ions diffused into the emulsified nanospheres, replaced Na+ from the ion exchanger (Na-TPB), and bonded to the ionophore (DB18C6). The DAC-selective nanospheres were successfully utilized to determine DAC in various samples, including standard solutions, commercial tablets (Daclavirocyrl®), serum, and urine. The method exhibited a linear dynamic range of 81.18 µg/mL to 81.18 pg/mL (10−4 to 10−10 M), achieved high recovery values ranging from 99.4% to 106.5%, and displayed excellent selectivity over similar interfering species (sofosbuvir and ledipasvir). The proposed method offers a new approach to determine the drug species (neutral, anionic, and cationic) without the requirement of water-soluble ligands or pH control.

show abstract

Two Novelties in Ion‐pair Formation‐based Potentiometric Titrations of Anionic Surfactants

Cited by 4 publications

References 23 publications

Potentiometric Sensing

Potentiometric Sensing

Carbon Paste Electrodes Surface-Modified with Surfactants: Principles of Surface Interactions at the Interface between Two Immiscible Liquid Phases

Ionophore-Based Nanosphere Emulsion Incorporating Ion-Exchanger for Picogram Potentiometric Determination of HCV Drug (Daclatasvir) in Pharmaceutical Formulations and Body Fluids

Contact Info

Product

Resources

About