Importance of ligand speciation in environmental research: A case study

Mika Sillanpää (Corresponding Author), Marjatta Orama, Jaakko Rämö, Aimo Oikari

Research output: Contribution to journalArticleScientificpeer-review

63 Citations (Scopus)

Abstract

The speciations of EDTA and DTPA in process, waste and river waters are modelled and simulated, specifically to the mode of occurrence in the pulp and paper mill effluents and subsequently in receiving waters. Due to relatively short residence times in bleaching process and waste water treatment and slow exchange kinetics, it is expected that the thermodynamic equilibrium is not necessarily reached. Therefore, the initial speciation plays a key role. As such, the simulations have been extended to the process waters of the pulp and paper industry taking into account estimated average conditions. The results reveal that the main species are; Mn and Ca complexes of EDTA and DTPA in pulp mill process waters; Fe(III) and Mn complexes of EDTA and DTPA in waste waters; Fe(III) and Zn complexes of EDTA and DTPA in receiving waters. It is also shown how the increasing concentration of complexing agents effects the speciation. Alkaline earth metal chelation plays a significant role in the speciation of EDTA and DTPA when there is a noticeable molar excess of complexing agents compared with transition metals.
Original languageEnglish
Pages (from-to)23-31
Number of pages9
JournalScience of the Total Environment
Volume267
Issue number1-3
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

Fingerprint

Pentetic Acid
DTPA
environmental research
Ethylenediaminetetraacetic acid
EDTA
Edetic Acid
ligand
Ligands
Water
Paper and pulp mills
Wastewater
mill
Alkaline Earth Metals
alkaline earth metal
Alkaline earth metals
chelation
pulp and paper industry
Paper and pulp industry
transition element
Bleaching

Cite this

Sillanpää, Mika ; Orama, Marjatta ; Rämö, Jaakko ; Oikari, Aimo. / Importance of ligand speciation in environmental research : A case study. In: Science of the Total Environment. 2001 ; Vol. 267, No. 1-3. pp. 23-31.
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Importance of ligand speciation in environmental research : A case study. / Sillanpää, Mika (Corresponding Author); Orama, Marjatta; Rämö, Jaakko; Oikari, Aimo.

In: Science of the Total Environment, Vol. 267, No. 1-3, 2001, p. 23-31.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Importance of ligand speciation in environmental research

T2 - A case study

AU - Sillanpää, Mika

AU - Orama, Marjatta

AU - Rämö, Jaakko

AU - Oikari, Aimo

PY - 2001

Y1 - 2001

N2 - The speciations of EDTA and DTPA in process, waste and river waters are modelled and simulated, specifically to the mode of occurrence in the pulp and paper mill effluents and subsequently in receiving waters. Due to relatively short residence times in bleaching process and waste water treatment and slow exchange kinetics, it is expected that the thermodynamic equilibrium is not necessarily reached. Therefore, the initial speciation plays a key role. As such, the simulations have been extended to the process waters of the pulp and paper industry taking into account estimated average conditions. The results reveal that the main species are; Mn and Ca complexes of EDTA and DTPA in pulp mill process waters; Fe(III) and Mn complexes of EDTA and DTPA in waste waters; Fe(III) and Zn complexes of EDTA and DTPA in receiving waters. It is also shown how the increasing concentration of complexing agents effects the speciation. Alkaline earth metal chelation plays a significant role in the speciation of EDTA and DTPA when there is a noticeable molar excess of complexing agents compared with transition metals.

AB - The speciations of EDTA and DTPA in process, waste and river waters are modelled and simulated, specifically to the mode of occurrence in the pulp and paper mill effluents and subsequently in receiving waters. Due to relatively short residence times in bleaching process and waste water treatment and slow exchange kinetics, it is expected that the thermodynamic equilibrium is not necessarily reached. Therefore, the initial speciation plays a key role. As such, the simulations have been extended to the process waters of the pulp and paper industry taking into account estimated average conditions. The results reveal that the main species are; Mn and Ca complexes of EDTA and DTPA in pulp mill process waters; Fe(III) and Mn complexes of EDTA and DTPA in waste waters; Fe(III) and Zn complexes of EDTA and DTPA in receiving waters. It is also shown how the increasing concentration of complexing agents effects the speciation. Alkaline earth metal chelation plays a significant role in the speciation of EDTA and DTPA when there is a noticeable molar excess of complexing agents compared with transition metals.

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JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

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