Ionic liquid salt bridge based on tributyl(2-methoxyethyl)phosphonium bis(pentafluoroethanesulfonyl)amide for stable liquid junction potentials in highly diluted aqueous electrolyte solutions.
A moderately hydrophobic ionic liquid, tributyl(2-methoxyethyl)phosphonium bis(pentafluoroethanesulfonyl)amide ([TBMOEP(+)][C(2)C(2)N(-)]), shows a very stable liquid junction potential upon contact with an aqueous solution whose ionic strength is as low as 1 μ mol dm(-3). The stability with the maximum excursion of the potential within ± 0.5 mV for 30 min is very promising for accurate determination of pH and other single ion activities potentiometrically.
Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.
Hideaki
H
Sakaida
Yuki
Y
Kitazumi
Takashi
T
Kakiuchi
D000577:Amides / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D004573:Electrolytes; D006863:Hydrogen-Ion Concentration; D007454:Iodides / Q000737:chemistry; D007477:Ions; D009943:Organophosphorus Compounds / Q000737:chemistry*; D011199:Potentiometry / Q000379:methods; D012492:Salts / Q000737:chemistry; D013449:Sulfonamides / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors
D000577:Amides; D004573:Electrolytes; D007454:Iodides; D007477:Ions; D009943:Organophosphorus Compounds; D012492:Salts; D013449:Sulfonamides