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Characterization of aquatic colloids by a combination of LIBD and ICP-MS following the size fractionation
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M. Bouby
Published/Copyright:
September 25, 2009
Summary
Humic colloids in deep groundwater are characterized in order to ascertain how heavy metal ions of chemical homologue to actinides are associated in different size fractions. The colloid size fractionation is made by two different methods: flow field flow fractionation (FFFF) and size exclusion chromatography (SEC), which is followed by analysis of chemical composition using UV spectroscopy for organic components and ICP-MS for inorganic components. Relative number density of humic colloids following the size fractionation is determined by laser-induced breakdown detection (LIBD). For the appraisal of colloid size change upon metal ion complexation, purified Aldrich humic acid is loaded with the Eu3+ ion on increasing the concentration and the size change is then determined by LIBD. Humic colloids are interacted with radioactive tracers, 155Eu(III) and 228Th(IV), to appreciate their sorption behaviour onto different colloid size fractions and thus to compare with natural humic colloid-borne elements of M(III) and M(IV).
Whereas the organic component of humic colloids is found in the size range about 3 nm, the inorganic components of actinides homologues, M(III) and M(IV), are observed in the fractionated size range from 10 nm to 35 nm. This observation leads us to presume that the inorganic composites, composed of heavy metal elements, are peptised by humic/fulvic acid. The laboratory traced elements, 155Eu(III) and 228Th(IV), are quantitatively sorbed only onto the organic component. This fact infers the complexation of traced metal ions with humic components of colloids without visible interaction with the inorganic components. Once purified humic acid is complexed with Eu(III) in an excess amount, the size increases over 200 nm and the resulting products undergo flocculation or precipitation. The results of the present experiment indicate that the natural humic colloid-borne heavy metal ions appear in different chemical states as compared to the same but laboratory traced metal ions. As a result, the laboratory simulation entails a better understanding of the underlying molecular level chemical reactions, which are important to the assessment of the colloid-borne actinide migration.
Received: 2001-10-19
Accepted: 2002-4-11
Published Online: 2009-9-25
Published in Print: 2002-9-1
© Oldenbourg Wissenschaftsverlag, München
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Articles in the same Issue
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- Investigation on uranyl interaction with bioactive ligands. Synthesis and structural studies of the uranyl complexes with glycine and N-(2-mercaptopropionyl)glycine
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- XAS study of technetium(IV) polymer formation in mixed sulphate/chloride media
- Complexation of uranium(VI) with malonate at variable temperatures
- The hydrolysis of uranium(VI)
- Corrosion and dissolution studies of UO2 containing α-emitters
- The effects of alpha-radiolysis on UO2 dissolution determined from electrochemical experiments with 238Pu-doped UO2
- Radiolytic formation of Tc(IV) oxide colloids
- Radiation-chemical effects in the near-field of a final disposal site: role of bromine on the radiolytic processes in NaCl-solutions
- The reduction of U(VI) on corroded iron under anoxic conditions
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- Structure alteration of C-S-H (calcium silicate hydrated phases) caused by sorption of caesium
- The effect of α-isosaccharinic acid on the stability of and Th(IV) uptake by hardened cement paste
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- Precipitation of technetium by subsurface sulfate-reducing bacteria
- Spectroscopic studies on the interaction of U(VI) with Bacillus sphaericus
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