Potentiometric study of the protonation equilibria of tartaric acid in aqueous sodium perchlorate solutions at 25 °C. Construction of a thermodynamic model

Castaño, Rosario; Etxebarria, Néstor; Madariaga, Juan Manuel

doi:10.1039/dt9940002729

Cited by 12 publications

(1 citation statement)

References 18 publications

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“…MBM has been successfully employed elsewhere to construct the thermodynamic models of several hydrolysis and complexation equilibria, [33][34][35][36] so it has been applied to explain thermodynamic data of mixture of electrolytes. 37 It has been used in this work to evaluate the activity coefficient.…”

Section: Calculations and Resultsmentioning

confidence: 99%

Potentiometric study of the hydrolysis of (CH3)Hg+ in NaClO4: construction of a thermodynamic model

Sanz

Raposo

Madariaga

2000

Appl. Organometal. Chem.

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The hydrolysis of CH 3 Hg was studied potentiometrically in NaClO 4 media in the range 0.1-3.0 mol dm À3 ionic strength at 25°C. Evaluation of data with the non-linear least-squares computer programs BSTAC and STACO led us to propose the formation of CH 3 HgOH and (CH 3 Hg) 2 OH species. The stoichiometric stability constants obtained for the two species at the different ionic strengths were correlated by means of Modified Bromley Methodology (MBM) to obtain the corresponding thermodynamic equilibrium constants, as well as the interaction parameters of the soluble species. This is the first of a series of potentiometric studies on the different equilibria of methylmercury with the majority of ions present in natural waters in order to simulate the behaviour of methylmercury in sea and estuary waters.

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Section: Calculations and Resultsmentioning

confidence: 99%

Potentiometric study of the hydrolysis of (CH3)Hg+ in NaClO4: construction of a thermodynamic model

Sanz

Raposo

Madariaga

2000

Appl. Organometal. Chem.

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Complexation of CH₃Hg⁺ with chloride, sulfate and carbonate in NaClO₄: construction of thermodynamic models

Sanz

Raposo

Diego

et al. 2002

Applied Organom Chemis

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The complexation of CH 3 Hg with major ions present in sea and estuary waters (Cl À , SO 4 2À and CO 3 2À ) was studied potentiometrically in an NaClO 4 medium in the ionic strength range 0.1± 3.0 mol dm À3 at 25°C. The potentiometric data, treated with non-linear least squares computer programs, led us to establish the formation of the species CH 3 HgCl in equilibrium with chloride, CH 3 Hg(SO 4 ) À species with sulfate and no complex with carbonate. The stoichiometric stability constants obtained at the different ionic strengths were correlated by means of the modified Bromley methodology (MBM) to determine the corresponding thermodynamic constants and interaction parameters. This study is the second of a series designed to simulate, using the MBM thermodynamic model, the behaviour of methylmercury in different conditions of sea and estuary waters. In the first study of the series, the hydrolysis equilibria of methylmercury in NaClO 4 ionic media were established.

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A comparison of equations for fitting protonation constants of carboxylic acids in aqueous tetramethylammonium chloride at various ionic strengths

1997

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Potentiometric study of the protonation equilibria of tartaric acid in aqueous sodium perchlorate solutions at 25 °C. Construction of a thermodynamic model

Cited by 12 publications

References 18 publications

Potentiometric study of the hydrolysis of (CH3)Hg+ in NaClO4: construction of a thermodynamic model

Potentiometric study of the hydrolysis of (CH3)Hg+ in NaClO4: construction of a thermodynamic model

Complexation of CH₃Hg⁺ with chloride, sulfate and carbonate in NaClO₄: construction of thermodynamic models

A comparison of equations for fitting protonation constants of carboxylic acids in aqueous tetramethylammonium chloride at various ionic strengths

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Potentiometric study of the protonation equilibria of tartaric acid in aqueous sodium perchlorate solutions at 25 °C. Construction of a thermodynamic model

Cited by 12 publications

References 18 publications

Potentiometric study of the hydrolysis of (CH3)Hg+ in NaClO4: construction of a thermodynamic model

Potentiometric study of the hydrolysis of (CH3)Hg+ in NaClO4: construction of a thermodynamic model

Complexation of CH3Hg+ with chloride, sulfate and carbonate in NaClO4: construction of thermodynamic models

A comparison of equations for fitting protonation constants of carboxylic acids in aqueous tetramethylammonium chloride at various ionic strengths

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Complexation of CH₃Hg⁺ with chloride, sulfate and carbonate in NaClO₄: construction of thermodynamic models