caa a22 4500 378927035 CHVBK 20180305123620.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/ract.92.9.559.54996 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.9.559.54996 Modeling of the complex formation of metal ions with humic acids [Elektronische Daten] [Osamu Tochiyama, Yuichi Niibori, Kouichi Tanaka, Takumi Kubota, Hirofumi Yoshino, Akira Kirishima, Budi Setiawan] Based on the conceptual model of cation-humic interactions considering the heterogeneous composition and polyelectrolyte nature of humic acids, the description of the interaction by the expression, log Kapp= log K - m log [M]+ a log α - b log [Na+], is proposed, where Kapp=[M··(zR)]/([M][R]), [M··(zR)] is the concentration of the cation bound to the humic acid, [M] is the concentration of the free cation with charge z, and [R] is the concentration of the free anionic sites of the humic acid, [R]=(CR-z[M··(zR)])α (CR is a total concentration of proton exchanging sites and α is a degree of dissociation). log K, m, a and b are the constant parameters depending on the cation and the humic acid. The expression is successfully applied to the experimental results on the complex formation (or protonation) of humate and polyacrylate (a homogeneous polymeric weak acid) with H+, NpO2+, Eu3+, Ca2+, Fe2+ and Fe3+ obtained under the condition where hydrolysis of cations and saturation of the reacting sites can be neglected. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Tochiyama Osamu aut Niibori Yuichi aut Tanaka Kouichi aut Kubota Takumi aut Yoshino Hirofumi aut Kirishima Akira aut Setiawan Budi aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 559-565 0033-8230 92:9-11/2004<559 2004 92 ract https://doi.org/10.1524/ract.92.9.559.54996 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.9.559.54996 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tochiyama Osamu aut NATIONALLICENCE 700 1- Niibori Yuichi aut NATIONALLICENCE 700 1- Tanaka Kouichi aut NATIONALLICENCE 700 1- Kubota Takumi aut NATIONALLICENCE 700 1- Yoshino Hirofumi aut NATIONALLICENCE 700 1- Kirishima Akira aut NATIONALLICENCE 700 1- Setiawan Budi aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 559-565 0033-8230 92:9-11/2004<559 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter