Influence of natural and anthropogenic ligands on metal transport during infiltration of river water to groundwater
Article Abstract:
Fe(III)-EDTA, one of the main species of the anthropogenic ligand EDTA, can remobilize adsorbed metals at pH values above 7 during infiltration from river to groundwater. This fraction of EDTA decreases from the river with 35% to 11% in groundwater within a residence time of about eight days. This was gleaned from an investigation of the behavior of the dissolved metals and the natural ligands for Cu and Zn during infiltration of river water to the adjacent aquifer at the Glatt River in Switzerland. The presence of natural ligands for Cu and Zn that bind a large amount of these metals strongly affect the speciation of EDTA.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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Speciation of EDTA in natural waters: exchange kinetics of Fe-EDTA in river water
Article Abstract:
The exchange kinetics of iron-ethylenediaminetetraacetate (Fe-EDTA) complexes with zinc (Zn) and calcium (Ca) under natural river water-like conditions was examined to characterize the time-dependent speciation of EDTA. Results revealed that the exchange of Fe-EDTA with Zn occurred very slowly and that the dissociation of Fe-EDTA was the rate-limiting step in the exchange reaction. The exchange reaction between Zn and Ca-EDTA, however, was much faster. Fe-EDTA complexes cannot form readily under river wateer conditions.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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Determination of the reaction quantum yield for the photochemical degradation of Fe(III)-EDTA: implications for the environmental fate of EDTA in surface waters
Article Abstract:
The photochemical reaction quantum yield between Fe(III) and ethylenediaminetetraacetic acid (EDTA) in surface waters was studied with respect to the water acidity, temperature and wavelength. The photochemical degradation rate of the Fe(III)-EDTA complex was computed using measured absorption spectra of the splution. Results indicate that the reaction quantum yield of the Fe(III)-EDTA complex is dependent on the wavelength but independent of the acidity.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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