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Europium(III) Complexed by HPSEC Size-Fractions of a Vertisol Humic Acid: Small Differences Evidenced by Time-Resolved Luminescence Spectroscopy

Abstract : The size fractionation of a humic acid (HA) by high performance size exclusion chromatography (HPSEC) was used as a proxy for the filtration effect during HA transport through a porous medium with minimum specific chemical interactions. The modification of the Eu(III)-HA complexes' formation with the different size-fractions, as compared to the bulk HA, was studied in time-resolved luminescence spectroscopy (TRLS). Clear modifications in Eu(III)-HA complexes' structures were shown and related to the molecular characteristics of the separated size-fractions. The properties of most of size-fractions did not induce a major alteration of the affinity towards Eu(III). Only the most hydrophilic fractions eluted in the tail of the chromatographic peak, representing about 11% of total fractions-weight, gave some significantly different parameters. Using a simplistic complexation model, it was found that the available complexation sites decreased with the size reduction of humic fractions.
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https://hal-cea.archives-ouvertes.fr/cea-00563824
Contributor : Pascal Reiller <>
Submitted on : Wednesday, December 16, 2020 - 9:45:53 AM
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Pascal E. Reiller, Julien Brevet, Antonio Nebbioso, Alessandro Piccolo. Europium(III) Complexed by HPSEC Size-Fractions of a Vertisol Humic Acid: Small Differences Evidenced by Time-Resolved Luminescence Spectroscopy. Spectrochimica acta. Part A: Molecular spectroscopy, Elsevier, 2011, 78 (3), pp.1173-1179. ⟨10.1016/j.saa.2010.12.075⟩. ⟨cea-00563824⟩

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