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

Sanz, Jon; Raposo, J.C.; Madariaga, Juan Manuel

doi:10.1002/1099-0739(200009)14:9<499::aid-aoc23>3.0.co;2-q

Cited by 8 publications

(7 citation statements)

References 33 publications

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“…The thermodynamic models proposed here to explain the complexation of methylmercury with chloride, sulfate and carbonate, and that were proposed previously for the hydrolysis of methylmercury, 6 constitute excellent tools to simulate the chemical behaviour of methylmercury in aquatic natural systems.…”

Section: Speciation Of Methylmercury In Natural Watersmentioning

confidence: 86%

“…23 All these calculations are explained in depth elsewhere. 6 Concentration and formation constants are given on a molar scale.…”

Section: Calculationsmentioning

confidence: 99%

“…B Ç MX is expressed by Eqn. (6), where B MX is the interaction parameter proposed by Bromley for each ion pair MX on the To calculate the activity coefficients in the case of uncharged species, as the methylmercuric chloride, the MBM uses the expression in Eqn. (7), where S MX,ionic medium is the salt coefficient on the molar scale (dm 3 mol À1 ) of the neutral species MX.…”

Section: àmentioning

confidence: 99%

“…for the chloride equilibrium and in Eqn. (10) for the sulfate equilibrium, in which B Ç MX are the functions of the corresponding Bromley terms described in Eqn (6)…”

mentioning

confidence: 99%

“…. log I b 11 log b 11 À 2 ) and making use of the nonlinear regression analysis program NLREG35 (with the B Na ,Cl À, B Na ,SO 4 2À and B CH 3 Hg ,ClO 4 À interaction parameters necessary for this fit having already been determined previously6,7 ) the values of the thermodynamic constants, two Bromley interaction parameters and the salts' coefficients necessary to construct the corresponding thermodynamic models were thus determined. Those values are as follows: log b 11 5:50 AE 0:02 for CH 3 Hg Cl À CH 3 HgCl log b 11 2:00 AE 0:02 for CH3 Hg SO…”

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confidence: 99%

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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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Section: Speciation Of Methylmercury In Natural Watersmentioning

confidence: 86%

“…23 All these calculations are explained in depth elsewhere. 6 Concentration and formation constants are given on a molar scale.…”

Section: Calculationsmentioning

confidence: 99%

Section: àmentioning

confidence: 99%

“…for the chloride equilibrium and in Eqn. (10) for the sulfate equilibrium, in which B Ç MX are the functions of the corresponding Bromley terms described in Eqn (6)…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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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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Enhanced adsorption capacity and selectivity toward inorganic and organic mercury ions from aqueous solution by dye‐affinity adsorbents

Saman

Johari

Song

et al. 2018

Env Prog and Sustain Energy

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Adsorption of inorganic mercury [Hg(II)] and organic methylmercury [MeHg(II)] ions onto dye‐affinity agrowaste (dye‐AW) was investigated. The dye‐affinity adsorbents were prepared by the chemical‐thermal reaction between the agrowaste (AW) and dye solutions [i.e., Reactive Red 120 (RR), Reactive Black B (RB), Methylene Blue (MB), and Methyl Orange (MO)] under an alkaline condition. An almost perfect removal of Hg(II) was observed for all adsorbents, while for MeHg(II), the dye‐affinity adsorbents have a higher removal efficiency than a pristine adsorbent. The maximum adsorption capacity (Qe, max) of mercury ions onto the Reactive Red 120‐modified AW (RR‐AW) was 2.60 mmol g−1 for Hg(II) and 0.76 mmol g−1 for MeHg(II). The adsorption rate of Hg(II) was faster than MeHg(II), and both kinetic data followed the pseudo‐second order kinetic model with the diffusion steps controlled by the film diffusion. The regenerated adsorbent showed very encouraging results especially toward Hg(II). The promising results were also obtained by using oilfield produced water (OPW) and natural gas condensate (NGC) samples. These studies finally demonstrated that the agricultural wastes initially loaded with dyes have the potential to be good mercury adsorbents. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S54–S67, 2019

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On‐line separation for the speciation of mercury in natural waters by flow injection‐cold vapour‐atomic absorption spectrometry

Sanz

Raposo

Larreta

et al. 2004

J of Separation Science

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Inorganic mercury and methylmercury are determined in natural waters by injecting the filtered samples onto a low cost commercial flow injection system in which an anion exchange microcolumn is inserted after the injection loop (FIA-IE). If hydrochloric acid is used as the carrier solution, the HgCl4(2-) species (inorganic mercury) will be retained by the anion exchanger while the CH3HgCI species (methylmercury) will flow through the resin with negligible retention. Four anion exchangers and seven elution agents were checked, in a batch mode, to search for the best conditions for optimal separation and elution of both species. Dowex M-41 and L-cysteine were finally selected. Mercury detection was performed by cold vapour-electrothermal atomic adsorption spectrometry (HG-ETAAS). Both systems were coupled to perform the continuous on-line separation/detection of both inorganic mercury and methylmercury species. Separation and detection conditions were optimized by two chemometric approaches: full factorial design and central composite design. A limit of detection of 0.4 microg L(-1) was obtained for both mercury species (RSD< 3.0% for 20 microg L(-1) inorganic and methylmercury solutions). The method was applied to mercury speciation in natural waters of the Nerbioi-lbaizabal estuary (Bilbao, North of Spain) and recoveries of more than 95% were obtained.

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

Cited by 8 publications

References 33 publications

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

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

Enhanced adsorption capacity and selectivity toward inorganic and organic mercury ions from aqueous solution by dye‐affinity adsorbents

On‐line separation for the speciation of mercury in natural waters by flow injection‐cold vapour‐atomic absorption spectrometry

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

Cited by 8 publications

References 33 publications

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

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

Enhanced adsorption capacity and selectivity toward inorganic and organic mercury ions from aqueous solution by dye‐affinity adsorbents

On‐line separation for the speciation of mercury in natural waters by flow injection‐cold vapour‐atomic absorption spectrometry

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Product

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

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