Comparison of two models for metal-humic interactions

Effect of low-dose ionizing radiation on luminous marine bacteria: radiation hormesis and toxicity

“…Its half-life is 432, 8 Years. It is known to be increasingly accumulated by the environment due to its ability to be bound by organic compounds, to concentrate on the surface of cells and penetrate through the cellular membrane by means of specific cellular proteins, siderophores (Choppin et al, 1971(Choppin et al, , 1997. For example, observations in the waters of the Chernobyl zone contaminated with radioactive fallout demonstrated that aquatic plants accumulate Am-241 in their biomass (Gudkov et al, 2002).…”

In situ uranium stabilization by microbial metabolites

“…The presence of hydroxyl groups, carboxyl density, and linear molecular structure of humics contributes to their strong surface complexation to iron oxides (Gu et al, 1995(Gu et al, , 1996. Humics can form innersphere complexes with metals (Xia et al, 1997) and polyelectrolytes are also capable of electrostatic interactions (Choppin and Labonne-Wall, 1997). The mobility of metal/humic-colloid complexes decreases as a result of humic interactions with the soil particles (Artinger et al, 2002).…”

Complexation of Radionuclides with Humic Substances

“…The models [12][13][14] developed by Kim et al and by Choppin et al are very similar but cannot be compared directly [14]. The dimensional units obtained for the interaction constants are identical, but based on different assumptions for the sites.…”

“…Among them are the "conservative roof" model [11], the charge neutralization model [12], the polyelectrolyte model [13], and other models presented in [10][11]14] with references therein.…”