Pitzer ion activities in mixed electrolytes for calibration of ion-selective electrodes used in clinical chemistry

Bastkowski, Frank; Spitzer, Petra; Eberhardt, R.; Adel, Beatrice; Wunderli, Samuel; Berdat, Daniel; Andres, Hanspeter; Brunschwig, Olivier; Máriássy, Michal; Fehér, Roger; Demuth, Caspar; Gonzaga, Fabiano Barbieri; Borges, Paulo Paschoal; Silva, Wiler Batista da; Vospĕlová, Alena; Vičarová, Martina; Srithongtim, Sirinapha

doi:10.1007/s00769-013-1016-5

Cited by 5 publications

(5 citation statements)

References 17 publications

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“…Therefore, either using an appropriate model for calculation of ionic activity coefficient through mean activity coefficient of electrolyte [7] or inevitably one may ignoring activity coefficient, i γ , and performing calibration against concentration [18]. Using directly concentration instead activity is widely used in biological and clinical applications.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…Shvedene et al [6] made a new ISE sensitive to ionic liquid so that solubility of some ionic liquids in water was measured accurately. In the clinical applications, ISEs have facilitated many studies that invoking measurement of ionic concentration in aqueous solutions which are involved in water treatment [7]. In the case of drinking water, determining ions is crucial for assessment of water quality.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Solubility of gypsum in aqueous NaCl + K 2 SO 4 solution using calcium ion selective electrode-investigation of ionic interactions

Haghtalab

Badizad

2016

Fluid Phase Equilibria

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solubility of gypsum in aqueous NaCl + K 2 SO 4 solution using calcium ion selective electrode-investigation of ionic interactions

Haghtalab

Badizad

2016

Fluid Phase Equilibria

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“…To date, the Pitzer equations are the only sensible way to model seawater properly and some major Pitzer-based efforts have been 153,154 and continue 156 to be made, strengthened no doubt by the suggestion that "Pitzer ion activities" in mixed electrolyte solutions can be used to calibrate ion selective electrodes. 239 Unfortunately, the task of ensuring internal consistency between Pitzer parameters is enormous and the usual limitations on Pitzer equations apply, as described above. It seems to us that, without any reasonable alternative at present, using the Pitzer equations to model seawater is an admirable goal.…”

Section: ■ Appendixmentioning

confidence: 99%

“…Any such predictions must be made from equilibrium constants characterized only at infinite dilution and/or in some other electrolyte medium. To date, the Pitzer equations are the only sensible way to model seawater properly and some major Pitzer-based efforts have been , and continue to be made, strengthened no doubt by the suggestion that “Pitzer ion activities” in mixed electrolyte solutions can be used to calibrate ion selective electrodes . Unfortunately, the task of ensuring internal consistency between Pitzer parameters is enormous and the usual limitations on Pitzer equations apply, as described above.…”

mentioning

confidence: 99%

Thermodynamic Modeling of Aqueous Electrolyte Systems: Current Status

May

Rowland

2017

J. Chem. Eng. Data

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The current status of thermodynamic modeling in aqueous chemistry is reviewed. A number of recent developments hold considerable promise, but these need to be weighed against ongoing difficulties with existing theoretical modeling frameworks. Some key issues are identified and discussed. These include long-standing difficulties in choosing the right program code, in comparing alternatives objectively, in implementing models as published, and in wasting effort on numerous proposed “modifications” and/or “improvements”. There needs to be greater awareness of the major limitations that such assorted variations in modeling functions imply for practical thermodynamic modeling purposes. They typically lack proper substantiation, fail to distinguish between cause and effect, and are presented in ways that all-too-often cannot be falsified. Numerical correlations in particular permit overoptimistic assertions based only on “satisfactory” fits, neglecting the dictum that regression analyses can be used to discredit hypotheses but not to prove them. The risks of “model tuning” should always be acknowledged and minimized. Recognition of the uncertainties in data that have not been confirmed by independent measurement needs to be redoubled. Modeling frameworks incapable of explicit trace activity coefficient prediction should no longer be regarded as credible. The current modeling paradigm evidently has to be reassessed, hopefully to find better ways forward, including new protocols which command sufficient support to warrant IUPAC endorsement.

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“…As a consequence, chemical laboratories require suitable certified reference materials (CRMs) for calibration [2,3], method development [4], validation [5], and quality control [6,7]. In volumetric analyses, which are among the most widely used analytical techniques for determining the concentration of solutions [8][9][10][11], primary standards or CRMs are needed to standardize the reagent solution-the titrant-for stoichiometrically reacting with the analyte in an unknown solution-the solution being titrated-to accurately determine the analyte's concentration.…”

Section: Introductionmentioning

confidence: 99%

Metrological evaluation of the certification of primary reference materials characterized by high-precision constant-current coulometry for the reliability of the titration analyses

Borges

Silva

2014

J Appl Electrochem

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The use of pure materials in chemical analysis is currently in high demand due to the need to provide reliable measurement results. In the Electrochemistry Laboratory of the National Institute of Metrology from Brazil (Inmetro) is located the primary system of coulometry, which is considered the standard of the measurement for the amount of substance. The main function of this primary system is to certify primary reference materials to ensure reliability and metrological traceability for titration analyses. Some important certified reference materials (CRMs), homogeneous, stable, and characterized with an accurate property value have been developed. This work aims to present the stages for certifying the primary reference materials in a metrological approach: potassium hydrogen phthalate for acid-base titration, potassium chloride for precipitation titration, and potassium dichromate for redox titration. In addition, the key comparisons that were necessary to demonstrate the national traceability structure's equivalence for these CRMs' international recognition will be shown.

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Pitzer ion activities in mixed electrolytes for calibration of ion-selective electrodes used in clinical chemistry

Cited by 5 publications

References 17 publications

Solubility of gypsum in aqueous NaCl + K 2 SO 4 solution using calcium ion selective electrode-investigation of ionic interactions

Solubility of gypsum in aqueous NaCl + K 2 SO 4 solution using calcium ion selective electrode-investigation of ionic interactions

Thermodynamic Modeling of Aqueous Electrolyte Systems: Current Status

Metrological evaluation of the certification of primary reference materials characterized by high-precision constant-current coulometry for the reliability of the titration analyses

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