Isolation and purification treatments change the metal-binding properties of humic acids: Effect of HF/HCl treatment

Wander G. Botero, Michael Pineau, Noémie Janot, Noémie Janot, Rute F. Domingos, José Mariano, Luciana S. Rocha, Jan E. Groenenberg, Marc F. Benedetti

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

Environmental contextStudying the mechanism of binding between metals and natural organic matter is fundamental to understanding the transport and availability of these contaminants in the environment. The influence of sample treatment on the purification of organic matter showed significant differences in the interaction with metals. The results will contribute to improved modelling of metal binding to organic matter in soils, thereby providing a basis for a more realistic risk assessment. AbstractWe studied the changes in metal binding characteristics of extracted humic acids induced by HF/HCl treatment followed by dialysis, i.e. the last step of the International Humic Substances Society (IHSS) extraction protocol. We performed metal binding experiments with both the alkaline-extracted material (AE) and the fully purified (FP) humic acid using the electrochemical stripping technique (AGNES) and modelled the results using the NICA-Donnan model. The results showed an increase of free Zn, Cd and Pb concentrations of ∼1 order of magnitude for the AE compared with the FP. These differences may be mostly explained by the different carbon content (51.3% FP and 36.5% AE) associated with an AE/FP carboxyl ratio of 0.5. Simulations using the NICA-Donnan model showed that halving the amount of carboxylic groups (Qmax,1) for the FP reduced this difference to 0.25 log units for Cd and Zn and to 0.15 log unit for Pb. There is a clear need for further research on the differences between purified v. less-disturbed natural organic material, which will contribute to improved modelling of metal binding to organic matter in soils, hence providing a basis for a more realistic risk assessment.
Original languageEnglish
Pages (from-to)417-424
JournalEnvironmental Chemistry
Volume14
Issue number7
DOIs
Publication statusPublished - 1 Jan 2017

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Humic Substances
metal binding
humic acid
Purification
purification
Metals
Biological materials
organic matter
risk assessment
Risk assessment
Soils
humic substance
Dialysis
modeling
soil
effect
material
Carbon
Availability
Impurities

Keywords

  • Alkaline-Extracted material
  • humic acid.

Cite this

Botero, W. G., Pineau, M., Janot, N., Janot, N., Domingos, R. F., Mariano, J., ... Benedetti, M. F. (2017). Isolation and purification treatments change the metal-binding properties of humic acids: Effect of HF/HCl treatment. Environmental Chemistry, 14(7), 417-424. https://doi.org/10.1071/EN17129
Botero, Wander G. ; Pineau, Michael ; Janot, Noémie ; Janot, Noémie ; Domingos, Rute F. ; Mariano, José ; Rocha, Luciana S. ; Groenenberg, Jan E. ; Benedetti, Marc F. / Isolation and purification treatments change the metal-binding properties of humic acids: Effect of HF/HCl treatment. In: Environmental Chemistry. 2017 ; Vol. 14, No. 7. pp. 417-424.
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abstract = "Environmental contextStudying the mechanism of binding between metals and natural organic matter is fundamental to understanding the transport and availability of these contaminants in the environment. The influence of sample treatment on the purification of organic matter showed significant differences in the interaction with metals. The results will contribute to improved modelling of metal binding to organic matter in soils, thereby providing a basis for a more realistic risk assessment. AbstractWe studied the changes in metal binding characteristics of extracted humic acids induced by HF/HCl treatment followed by dialysis, i.e. the last step of the International Humic Substances Society (IHSS) extraction protocol. We performed metal binding experiments with both the alkaline-extracted material (AE) and the fully purified (FP) humic acid using the electrochemical stripping technique (AGNES) and modelled the results using the NICA-Donnan model. The results showed an increase of free Zn, Cd and Pb concentrations of ∼1 order of magnitude for the AE compared with the FP. These differences may be mostly explained by the different carbon content (51.3{\%} FP and 36.5{\%} AE) associated with an AE/FP carboxyl ratio of 0.5. Simulations using the NICA-Donnan model showed that halving the amount of carboxylic groups (Qmax,1) for the FP reduced this difference to 0.25 log units for Cd and Zn and to 0.15 log unit for Pb. There is a clear need for further research on the differences between purified v. less-disturbed natural organic material, which will contribute to improved modelling of metal binding to organic matter in soils, hence providing a basis for a more realistic risk assessment.",
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Botero, WG, Pineau, M, Janot, N, Janot, N, Domingos, RF, Mariano, J, Rocha, LS, Groenenberg, JE & Benedetti, MF 2017, 'Isolation and purification treatments change the metal-binding properties of humic acids: Effect of HF/HCl treatment', Environmental Chemistry, vol. 14, no. 7, pp. 417-424. https://doi.org/10.1071/EN17129

Isolation and purification treatments change the metal-binding properties of humic acids: Effect of HF/HCl treatment. / Botero, Wander G.; Pineau, Michael; Janot, Noémie; Janot, Noémie; Domingos, Rute F.; Mariano, José; Rocha, Luciana S.; Groenenberg, Jan E.; Benedetti, Marc F.

In: Environmental Chemistry, Vol. 14, No. 7, 01.01.2017, p. 417-424.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Isolation and purification treatments change the metal-binding properties of humic acids: Effect of HF/HCl treatment

AU - Botero, Wander G.

AU - Pineau, Michael

AU - Janot, Noémie

AU - Janot, Noémie

AU - Domingos, Rute F.

AU - Mariano, José

AU - Rocha, Luciana S.

AU - Groenenberg, Jan E.

AU - Benedetti, Marc F.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Environmental contextStudying the mechanism of binding between metals and natural organic matter is fundamental to understanding the transport and availability of these contaminants in the environment. The influence of sample treatment on the purification of organic matter showed significant differences in the interaction with metals. The results will contribute to improved modelling of metal binding to organic matter in soils, thereby providing a basis for a more realistic risk assessment. AbstractWe studied the changes in metal binding characteristics of extracted humic acids induced by HF/HCl treatment followed by dialysis, i.e. the last step of the International Humic Substances Society (IHSS) extraction protocol. We performed metal binding experiments with both the alkaline-extracted material (AE) and the fully purified (FP) humic acid using the electrochemical stripping technique (AGNES) and modelled the results using the NICA-Donnan model. The results showed an increase of free Zn, Cd and Pb concentrations of ∼1 order of magnitude for the AE compared with the FP. These differences may be mostly explained by the different carbon content (51.3% FP and 36.5% AE) associated with an AE/FP carboxyl ratio of 0.5. Simulations using the NICA-Donnan model showed that halving the amount of carboxylic groups (Qmax,1) for the FP reduced this difference to 0.25 log units for Cd and Zn and to 0.15 log unit for Pb. There is a clear need for further research on the differences between purified v. less-disturbed natural organic material, which will contribute to improved modelling of metal binding to organic matter in soils, hence providing a basis for a more realistic risk assessment.

AB - Environmental contextStudying the mechanism of binding between metals and natural organic matter is fundamental to understanding the transport and availability of these contaminants in the environment. The influence of sample treatment on the purification of organic matter showed significant differences in the interaction with metals. The results will contribute to improved modelling of metal binding to organic matter in soils, thereby providing a basis for a more realistic risk assessment. AbstractWe studied the changes in metal binding characteristics of extracted humic acids induced by HF/HCl treatment followed by dialysis, i.e. the last step of the International Humic Substances Society (IHSS) extraction protocol. We performed metal binding experiments with both the alkaline-extracted material (AE) and the fully purified (FP) humic acid using the electrochemical stripping technique (AGNES) and modelled the results using the NICA-Donnan model. The results showed an increase of free Zn, Cd and Pb concentrations of ∼1 order of magnitude for the AE compared with the FP. These differences may be mostly explained by the different carbon content (51.3% FP and 36.5% AE) associated with an AE/FP carboxyl ratio of 0.5. Simulations using the NICA-Donnan model showed that halving the amount of carboxylic groups (Qmax,1) for the FP reduced this difference to 0.25 log units for Cd and Zn and to 0.15 log unit for Pb. There is a clear need for further research on the differences between purified v. less-disturbed natural organic material, which will contribute to improved modelling of metal binding to organic matter in soils, hence providing a basis for a more realistic risk assessment.

KW - Alkaline-Extracted material

KW - humic acid.

U2 - 10.1071/EN17129

DO - 10.1071/EN17129

M3 - Article

VL - 14

SP - 417

EP - 424

JO - Environmental Chemistry

JF - Environmental Chemistry

SN - 1448-2517

IS - 7

ER -