Accounting for natural organic matter in aqueous chemical equilibrium models: a review of the theories and applications

Dudal, Yves; Gérard, Frédéric

doi:10.1016/j.earscirev.2004.01.002

Cited by 116 publications

(70 citation statements)

References 105 publications

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“…Tipping, 1998;Kinniburgh et al, 1999;Dudal and Gérard, 2004;Lenoble et al, 2008). In this study, to calculate Fe(II) speciation, and particularly its interactions with the dissolved organic matter, the WinHumicV (Gustafsson, 1999) model has been used.…”

Section: Fe(ii) Speciation Modellingmentioning

confidence: 99%

Strong chemical evidence for high Fe(II)-colloids and low As-bearing colloids (200nm–10kDa) contents in groundwater and flooded paddy fields in Bangladesh: A size fractionation approach

Garnier

Hurel

Garnier

et al. 2011

Applied Geochemistry

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Section: Fe(ii) Speciation Modellingmentioning

confidence: 99%

Strong chemical evidence for high Fe(II)-colloids and low As-bearing colloids (200nm–10kDa) contents in groundwater and flooded paddy fields in Bangladesh: A size fractionation approach

Garnier

Hurel

Garnier

et al. 2011

Applied Geochemistry

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“…Accordingly, more research is needed to investigate the metal-binding properties of hydrophobic and hydrophilic acids from different sources and for a greater number of metals. As pointed out by Dudal and Gérard (2004), improvement of the capacity of chemical equilibrium models to deal with non-humic substances, including hydrophilic acids, constitutes an important research direction.…”

Section: Metals In Natural Waters Generally Exist In Different Physicmentioning

confidence: 99%

Acid–base and copper-binding properties of three organic matter fractions isolated from a forest floor soil solution

Schaik

Kleja

Gustafsson

2010

Geochimica et Cosmochimica Acta

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ABSTRACT.Vast amounts of knowledge about the proton-and metal-binding properties of dissolved organic matter (DOM) in natural waters have been obtained in studies on isolated humic and fulvic (hydrophobic) acids. Although macromolecular hydrophilic acids normally make up about one-third of DOM, their proton-and metal-binding properties are poorly known. Here we investigated the acid-base and Cu-binding properties of the hydrophobic (fulvic) acid fraction and two hydrophilic fractions isolated from a soil solution. Proton titrations revealed a higher total charge for the hydrophilic acid fractions than for the hydrophobic acid fraction. The most hydrophilic fraction appeared to be dominated by weak acid sites, as evidenced by increased slope of the curve of surface charge versus pH at pH values above 6. The titration curves were poorly predicted by both Stockholm Humic Model (SHM) and NICA-Donnan model calculations using generic parameter values, but could be modelled accurately after optimisation of the proton-binding parameters (pH ≤ 9). Cu-binding isotherms for the three fractions were determined at pH values of 4, 6 and 9. With the optimised proton-binding parameters, the SHM model predictions for Cu binding improved, whereas the NICA-Donnan predictions deteriorated. After optimisation of Cu-binding parameters, both models described the experimental data satisfactorily. Iron(III) and aluminium competed strongly with Cu for binding sites at both pH 4 and pH 6. The SHM model predicted this competition reasonably well, but the NICA-Donnan model underestimated the effects significantly at pH 6. Overall, the Cu-binding behaviour of the two hydrophilic acid fractions was very similar to that of the hydrophobic acid fraction, despite the differences observed in 3 proton-binding characteristics. These results show that for modelling purposes, it is essential to include the hydrophilic acid fraction in the pool of 'active' humic substances.

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“…Role of natural organic matter NOM consists of a mixture of organic compounds with different structures and functional groups. These groups include aromatic and phenolic moieties, carboxylic and heteroaliphatic hydroxyl functional groups, and free radicals (Dudal & Ge´rard 2004). NOM contain redoxactive functional groups, such as quinones, and have the ability to form NOM-metal complexes (Haack & Warren 2003).…”

Section: Transport and Redox Reactionsmentioning

confidence: 99%

“…The term humic substances refers to a category of naturally occurring organic materials found in soils, sediments, and natural waters. Humic acids contain acidic groups such as carboxyl and phenolic OH functional groups (Dudal & Ge´rard 2004) and, therefore, provide organic macromolecules with an important role in the transport, bioavailability, and solubility of heavy metals (Halim et al 2003). Humic acids were applied to a cadmium-contaminated soil at various dosages, and the uptake of cadmium into Nicotiana tabacum SR-1 was determined in relation to the amounts of total and bioavailable cadmium in the soil (Evangelou et al 2004).…”

Section: Bioavailability and Phytoremediationmentioning

confidence: 99%

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Hullebusch

Lens

Tabak

2005

Rev Environ Sci Biotechnol

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The biotransformation of metals is an exciting, developing strategy to treat metal contamination, especially in environments that are not accessible to other remediation technologies. However, our ability to benefit from these strategies hinges on our ability to monitor these transformations in the environment. That's why remediation of contaminated sediments and soil requires detailed in situ characterization of the speciation of the toxic substances and their transformations with respect to time and spatial distribution. The present paper gives an overview of the literature regarding research performed in the laboratory as well as in the field.

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Accounting for natural organic matter in aqueous chemical equilibrium models: a review of the theories and applications

Cited by 116 publications

References 105 publications

Strong chemical evidence for high Fe(II)-colloids and low As-bearing colloids (200nm–10kDa) contents in groundwater and flooded paddy fields in Bangladesh: A size fractionation approach

Strong chemical evidence for high Fe(II)-colloids and low As-bearing colloids (200nm–10kDa) contents in groundwater and flooded paddy fields in Bangladesh: A size fractionation approach

Acid–base and copper-binding properties of three organic matter fractions isolated from a forest floor soil solution

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

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