Effect of anionic surfactants on calcium ion-selective electrodes

Craggs, A.; Moody, G. J.; Thomas, J. D. R.; Birch, Brian J.

doi:10.1039/an9800500426

Cited by 30 publications

(14 citation statements)

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“…Replacement of DOPP with TOP or decan-1-ol as membrane plasticizer favors reducing the interference from anionic surfactants [5,6]. It is known that decan-1-ol exudes from PVC membranes and the respective ISEs dont last.…”

Section: Choice Of the Membrane Formulationsmentioning

confidence: 97%

“…The biggest changes of the ISE potentials were registered for electrodes with membranes based on alkylphosphoric acids as charged ionophores with dioctylphenylphosphonate (DOPP) as plasticizer. Replacement of DOPP with trioctylphosphate or decan-1-ol allowed reducing the effect of the surfactant [6,7]. It was also shown that interferences from lipid biochemicals like cholic acid, cholesterol, lecithin, and vitamin D 2 can be decreased by use of tri(2-ethylhexyl)phosphate (TOP) as plasticizer [8].…”

Section: Introductionmentioning

confidence: 96%

“…sodium dodecylsulfate (NaDS). Significant shifts of the electrode potentials to less positive values upon addition of even 2 10 À5 M NaDS were reported [5], as well as shifts to more positive values [6]. The biggest changes of the ISE potentials were registered for electrodes with membranes based on alkylphosphoric acids as charged ionophores with dioctylphenylphosphonate (DOPP) as plasticizer.…”

Section: Introductionmentioning

confidence: 98%

“…Therefore monitoring surfactants and water hardness in parallel is needed during some industrial processes. Studies performed in the early days of the ISE research [4][5][6] revealed a number of peculiar effects when ISEs, in particular -Ca-ISEs contact with solutions containing anionic surfactants, e.g. sodium dodecylsulfate (NaDS).…”

Section: Introductionmentioning

confidence: 99%

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Calcium‐Selective Electrodes for Measurements in the Presence of Anionic Surfactants

et al. 2011

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Calcium selective electrodes with various membrane formulations were studied in solutions containing CaCl 2 and sodium dodecylsulfate (NaDS). It is shown that electrodes based on neutral ionophores ETH 1001 and ETH 129 cannot be used as Ca 2 + ion sensors in these solutions because of strong anion interference from DS À anion. Among other formulations, that based on calcium bis(tetramethylbutylphenyl)phosphate in tri(2-ethylhexyl)phosphate appear the most promising. The interpretation of the ISE response in solutions under study relied on a novel approach which considers three forms of calcium: Ca 2 + free ions, Ca in Ca(DS) 2 precipitate, and Ca 2 + bound by the DS À micelles. Data needed for the respective calculations were obtained by DS À selective electrode based on tetradecylammonium, and Na + selective glass electrode.

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Section: Choice Of the Membrane Formulationsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Calcium‐Selective Electrodes for Measurements in the Presence of Anionic Surfactants

et al. 2011

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“…It was reported that poly(ethylene oxide)-based nonionic surfactants can interfere with the potentiometric response of poly(vinyl chloride) (PVC) membrane-based cation-selective membranes, resulting in significant errors in the measurement of alkali and alkaline earth metal cations. 3,[6][7][8][9] However, the effects of nonionic surfactants on the EMF responses of ISEs based on various polymer matrices other than PVC have not been documented yet.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surfactants on the Electrochemical Performance of Cation-Selective Membrane Electrodes

Oh¹,

Sig²,

Nam³

2003

Bulletin of the Korean Chemical Society

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We examined the effect of polyether-type nonionic surfactants (Brij 35, Triton X-100, Tween 20 and Tween 80) on the potentiometric properties of sodium-, potassium-and calcium-selective membranes which are prepared with widely used ionophores and four kinds of polymer matrices [poly(vinyl chloride) (PVC), polyurethane (PU), PVC/PU blend, and silicone rubber (SR)]. It was found that the PVC-based membranes, which provide the best performance among all other matrix-based membranes in the absence of nonionic surfactants, exhibited larger change in their potentiometric properties when nonionic surfactants are added to the sample solution. On the other hand, the sodium-selective SR-based membrane with calix[4]arene, potassium-selective PVC/PU-or SR-based membrane with valinomycin, and the calcium-selective SR-based membrane with ETH 1001 provide almost identical analytical performance in the presence and absence of Tween 20 or Tween 80 surfactants. The origin of nonionic surfactants effect was also investigated by interpreting the experimental results obtained with various matrices and ionophores. The results suggest that the nonionic surfactant extracted into the membrane phase unselectively form complexes with the primary and interfering ions, resulting in increased background potential and lower binding ability for the ionophore. Such effects should result in deteriorated detection limits, reduced response slopes and lower selectivity for the primary ions.

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