caa a22 4500 378881930 CHVBK 20180305123434.0 cr unu---uuuuu 161128e20030301xx s 000 0 eng 10.1524/ract.91.3.135.19980 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.3.135.19980 Influence of humic acid size on actinide complexation [Elektronische Daten] [Jean-Marc Monsallier, Gregory R. Choppin] The complexation of Am(III) and Eu(III) with humic acid of different molecular sizes was measured and the data for the ≥300kD and ≥10kD sized HA at pcH 4.0 and 6.0 was analyzed by the Charge Neutralization Model (CNM) and the Polyelectrolyte Model (PM). For the PM, solvent extraction was used to obtain the stability constants of 241Am at tracer concentration. For the CNM, ultrafiltration was used to determine the loading capacity and the stability constants for Eu(III) at macro concentrations. There was a difference of 1-2orders of magnitude in the stability constants from the two models. The 5D0-7F0 excitation spectra of Eu(III) as a function of loading of HA was found to have a shift in wavenumbers of the peak maximum, indicating that the coordination environment of Eu(III) varied with pH, presumably due to variation in the number of functional groups of the humate bound to the metal ion. © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Monsallier Jean-Marc aut Choppin Gregory R. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/3/2003(2003-03-01), 135-140 0033-8230 91:3/2003<135 2003 91 ract https://doi.org/10.1524/ract.91.3.135.19980 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.3.135.19980 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Monsallier Jean-Marc aut NATIONALLICENCE 700 1- Choppin Gregory R. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/3/2003(2003-03-01), 135-140 0033-8230 91:3/2003<135 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter