title: On the use of spectroscopic techniques for interaction studies, part I: complexation between europium and small organic ligands.
abstract: In the framework of environmental studies, it is important to understand the interaction of humic substances with cations (heavy metals, radionuclides) and to determine their complexation constants in order to evaluate their potential impact on their fate. For this purpose, two techniques have been used: electrospray ionization mass spectrometry, a newly used technique in speciation studies, and time-resolved laser-induced fluorescence spectrometry, a well-known technique for such studies. As a first step, for simplification purposes and to compare both techniques, simple molecules having functional groups present in humic substances have been selected, such as acetic, glycolic, and 4-hydroxyphenylacetic acids. Both techniques have been used to obtain stoichiometries and complexation constants between these simple molecules and europium (III).
authors.affiliation: DEN/DPC/SECR/LSRM, CEA-Saclay, 91191 Gif-sur-Yvette, France.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Plancque
authors.forename: Yoann
authors.initials: Y
authors.lastname: Maurice
authors.forename: Valérie
authors.initials: V
authors.lastname: Moulin
authors.forename: Pierre
authors.initials: P
authors.lastname: Toulhoat
authors.forename: Christophe
authors.initials: C
authors.lastname: Moulin
mesh_terms: D005063:Europium / Q000032:analysis* / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis*; D008024:Ligands; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012989:Soil Pollutants / Q000032:analysis*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D006812:Humic Substances; D008024:Ligands; D009930:Organic Chemicals; D012989:Soil Pollutants; D005063:Europium