Metal Ion Binding to Humic Substances: Application of the Non-Ideal Competitive Adsorption Model

Benedetti, Marc F.; Milne, C J; Kinniburgh, D.G.; Riemsdijk, W.H. van; Koopal, L.K.

doi:10.1021/es00002a022

Cited by 556 publications

(444 citation statements)

References 23 publications

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“…The amounts of Cu 2+ and Ca 2+ bound are, in both cases, in the range of previously published data for humic acids of different origin (12,14). However, the steeper slope of the Ca 2+ binding isotherm, compared to the one obtained in a previous study (24), indicates that the Gohy-573 HA is more chemically heterogeneous than the purified peat humic acid, because the degree of heterogeneity controls the slope of the binding isotherm (12).…”

Section: Time-resolved Laser Fluorescence Measurementsupporting

confidence: 75%

Combining Spectroscopic and Potentiometric Approaches to Characterize Competitive Binding to Humic Substances

Marang

Reiller

Eidner

et al. 2008

Environ. Sci. Technol.

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In an area that contains high concentrations of natural organic matter, it is expected that it plays an important role on the behavior of rare earth elements (REE), like europium, and of trivalent actinides. Competitive interactions with H + , inorganic species, major cations, e.g., Ca(II) or Mg(II), could influence these metals transport and bioavailability. Competitive experiments between cations, which can bind differently to humic substances and Eu 3+ , will bring an improved understanding of the competitive mechanisms. The aim of this study is to acquire data for Eu(III)/Cu(II) and Eu(III)/Ca(II) competitive binding to a sedimentary originated humic acid (Gorleben, Germany). The NICA-Donnan parameters for Ca 2+ , Cu 2+ , and Eu 3+ obtained from competitive binding experiments using Ca 2+ or Cu 2+ ion selective electrodes were used to model time-resolved laser fluorescence spectroscopy (TRLFS) measurements. Eu 3+ and Cu 2+ are in direct competition for the same type of sites, whereas Ca 2+ has an indirect influence through electrostatic binding.

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Section: Time-resolved Laser Fluorescence Measurementsupporting

confidence: 75%

Combining Spectroscopic and Potentiometric Approaches to Characterize Competitive Binding to Humic Substances

Marang

Reiller

Eidner

et al. 2008

Environ. Sci. Technol.

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“…(4) can be found in literature, see e.g. [5,6]. This is also the case for PAHA, Saito et al [45] used b PAHA = 0.63.…”

Section: Choice Of Model Parametersmentioning

confidence: 84%

“…Proton binding to HS is well studied; it can be used to characterize HS from physical point of view [1,2] and is the basis for a better understanding of the binding behavior of other ions [3]. Adsorption of heavy metal ions is well documented and both the NICA-Donnan model [4][5][6][7][8][9][10] and Model VI [11] are able to describe and predict metal ion binding to HS as a function of pH, salt concentration and concentration of other competing ions. Also complex formation of HS with cationic polyelectrolytes is well studied.…”

Section: Introductionmentioning

confidence: 99%

Predictive model of cationic surfactant binding to humic substances

Ishiguro

Koopal

2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The humic substances (HS) have a high reactivity with other components in the natural environment. An important factor for the reactivity of HS is their negative charge. Cationic surfactants bind strongly to HS by electrostatic and specific interaction. Therefore, a surfactant binding model is developed that takes both the specific and electrostatic interactions explicitly into account. The model is analogous to that of ion binding to HS with the NICA-Donnan model,

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“…Lignin contains two major types of functional groups that have strong interactions with metal ions: carboxylic and phenolic groups [41][42][43]. These two types of sites have often been used to describe the metal ion binding to humic substances, which contain carboxylic and phenolic groups as the main surface functional groups [44][45][46]. Therefore a two-site model was used to fit the titration data.…”

Section: Surface Site Concentrations and Surface Aciditymentioning

confidence: 99%

Adsorption of metal ions on lignin

Guo

Zhang

Shan

2008

Journal of Hazardous Materials

655

242

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This study investigated the adsorption of the heavy metal ions Pb(II), Cu(II), Cd(II), Zn(II), and Ni(II) on a lignin isolated from black liquor, a waste product of the paper industry. Lignin has affinity with metal ions in the following order: Pb(II) > Cu(II) > Cd(II) > Zn(II) > Ni(II). The adsorption kinetic data can be described well with a pseudosecond-order model and the equilibrium data can be fitted well to the Langmuir isotherm. Metal ion adsorption was strongly dependent on pH and ionic strength. Surface complexation modelling was performed to elucidate the adsorption mechanism involved. This shows that lignin surfaces contain two main types of acid sites attributed to carboxylic-and phenolic-type surface groups and the phenolic sites have a higher affinity for metal ions than the carboxylic sites.

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Metal Ion Binding to Humic Substances: Application of the Non-Ideal Competitive Adsorption Model

Cited by 556 publications

References 23 publications

Combining Spectroscopic and Potentiometric Approaches to Characterize Competitive Binding to Humic Substances

Combining Spectroscopic and Potentiometric Approaches to Characterize Competitive Binding to Humic Substances

Predictive model of cationic surfactant binding to humic substances

Adsorption of metal ions on lignin

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