Redox interactions of Pu(V) in solutions containing different humic substances

Arsenic and fluoride contaminated groundwaters: A review of current technologies for contaminants removal

“…This indicates that the presence of organic matter may greatly influence redox as well as complexation speciation of As. Similar reports about humic substances have been published elsewhere (Blinova et al, 2007;Perminova et al, 2007;Zhilin et al, 2004). The presence of amine groups in organic matter play significant role due to their protonation at definite pH values (Saada et al, 2003;Sorkina et al, 2014).…”

Influence of humic acid on plutonium sorption to gibbsite: Determination of Pu-humic acid complexation constants and ternary sorption studies

“…Commonly found coating the surface of inorganic material, NOM can change surface characteristics and affect mineral colloid stability and mobility [1]. The presence of dissolved NOM has been shown to result in the formation of stable Pu-NOM solution complexes and the reduction of Pu(V) to Pu(IV) [2][3][4][5][6][7]. A few studies suggest that the distribution coefficients for Pu sorption to sediments and aquifer materials decrease in the presence of NOM [3,[8][9][10][11][12].…”

Humic acid model substances with pronounced redox functionality for the study of environmentally relevant interaction processes of metal ions in the presence of humic acid

“…Studies with regard to the reduction of Fe(III) Deiana et al, 1995), Cr(VI) Szulczewski et al, 2001), Hg(II) (Allard and Arsenie, 1991;Rocha et al, 2003), and As(V) (Palmer et al, 2006) as well as concerning the reduction of actinide ions such as Pu(VI) and Np(VI) (Choppin, 1999;Nash et al, 1981), Pu(V) (André and Choppin, 2000;Blinova et al, 2007), Pu(VI), (V) and (IV) (Marquardt et al, 2004) and Np(V) (Schmeide and Bernhard, 2009;Zeh et al, 1999) were published. The reduction of U(VI) by natural organic matter was not clearly observed (Artinger et al, 2002;Choppin, 1999;Gu and Chen, 2003;Nash et al, 1981).…”