Effect of complexation with humic substances on diffusion of metal ions in water

Furukawa, Kenji; Takahashi, Yoshio

doi:10.1016/j.chemosphere.2008.07.017

Cited by 29 publications

(19 citation statements)

References 27 publications

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“…The diffusion coefficients, the ionic radii and the ionic potentials (I p ) of M n+ and M-EDTA (Z-4)+ complexes were summerized in Table 1. The results were compared with the D w measuremed by diffusion cell method and the limiting molar ionic conductivites using the Nernst-Einstein equation 1,10,14,16 . The diffusion coefficient was obtained by fitting the experimental data as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Diffusion coefficient of RNs in water (D w ) is one of the most important parameters to predict the diffusion behavior of RNs in backfill material and the surrounding rock. The diffusion cell method is often used in determining the diffusion coefficient of RNs in water 1,10 and in minerals 6,11 . EDTA can alter diffusion of RNs by complexaion reaction or by the modification of the properties of minerals.…”

Section: Introductionmentioning

confidence: 99%

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Study of the diffusion of metals and metals-EDTA complexes in water by capillary method

et al. 2021

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EDTA can complex with radionuclides (RNs) to form negatively charged complexes, making it difficult for clay minerals to retard the diffusion of RNs waste. The diffusion coefficient of RNs in water (Dw) is an important parameter for the safety assessment of the repository. In this study, the effectsof EDTA on the diffusion of metal ions (Cu2+, Sm3+, Nd3+, Lu3+ and Zn2+) were investigated by a capillary method. The experimental results showed that [Cu-EDTA]2-, [Sm-EDTA]-and [La-EDTA]-have higher Dw thanthe Mn+. Whereas, [Nd-EDTA]-and [Zn-EDTA]2- have lower Dw than Nd3+ and Zn2+ cations. The Dw is consistent with the literatures, indicating the validity of the capillary method to determine the diffusion coefficients. According to Stokes-Einstein relation, the ionic radius and ionic potential of the ion are in disproportional to the Dw value. Cu-, Sm-and La-EDTA complexes have smaller molecular size than the uncomplexed metal ions, indicating that the Mn+ ions might be associated with many water molecules to form hydrated ions with larger ionic radius. Whereas the [Nd-EDTA]-and [Zn-EDTA]2- have larger molecular size than Nd3+ and Zn2+ cations.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the diffusion of metals and metals-EDTA complexes in water by capillary method

et al. 2021

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“…5(b), rather than solely colloidal, double-layer (charge neutralization) effects [51]. The increased binding of higher valence cations to HA has been identified by other workers [19,52], and utilized in metal ion extraction [53].…”

Section: Cation Effects On Ha Dissolution and S1 Precipitation Behaviormentioning

confidence: 88%

Water-based fractionation of a commercial humic acid. Solid-state and colloidal characterization of the solubility fractions

Swiech

Hamerton

Zeng³

et al. 2017

Journal of Colloid and Interface Science

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Using this simple approach, the HA has been shown to contain non-covalently bonded species with different polarity and water solubility. The soluble and insoluble fractions have very different chemical structures, as revealed particularly by their solid-state properties (C NMR and IR spectroscopy, and TGA); in particular, S1 and S2 are characterized by higher carbonyl and aromatic contents, compared with I1 and I2. As shown by solution SAXS measurements and AFM, the soluble fractions behave as hydrophilic colloidal aggregates of at least 50nm diameter.

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“…The results confirm that Schubert's method can be used not only for stoichiometrically defined ligands but also for complexes of polyfunctional and stoichiometrically undefined ligands, such humic ligands are. Finding the relative order of metal-humic complexes stabilities can help in estimation of the fate transport and distribution of heavy metals through different compartments of the environment [16][17][18].…”

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confidence: 99%

Comparative study of binding strengths of heavy metals with humic acid

Kostić

Andjelković

Nikolić

et al. 2013

Hem Ind

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The complexation of humic acid with certain heavy metal ions (Co(II), Ni(II), Cu(II), Zn(II) and Pb(II)) was investigated. The stability constants of humate complexes were determined by a method based on the distribution of metal ions between solution and resin in the presence and the absence of ligand, known as Schubert's ion exchange method. Experiments were performed at 25 °C, pH 4.0 and ionic strength of 0.01 mol dm-3. It was found that the 1:1 complexes were formed between metal ions and humic acid. Obtained results of the stability constants, log β mn , of complexes formed between the metal ions and humic acid follow the order Co(II) < Ni(II) < Cu(II) > Zn(II), which is the same as in the Irving-Williams series for the binding strength of divalent metal ion complexes. The stability constant of complex between Pb(II) ions and humic acid is greater than the stability constants of other investigated metal-humate complexes. The investigation of interaction between heavy metal ions and humics is important for the prediction of the distribution and control of the migration of heavy metals in natural environment.

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Effect of complexation with humic substances on diffusion of metal ions in water

Cited by 29 publications

References 27 publications

Study of the diffusion of metals and metals-EDTA complexes in water by capillary method

Study of the diffusion of metals and metals-EDTA complexes in water by capillary method

Water-based fractionation of a commercial humic acid. Solid-state and colloidal characterization of the solubility fractions

Comparative study of binding strengths of heavy metals with humic acid

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