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Laboratory experiments were carried out to examine the role of natural organic matter (NOM) in regulating the adsorption and fractionation of 234Th and 233Pa in seawater on inorganic nanoparticles (20nm), including SiO2, CaCO3, Fe2O3, Al2O3 and TiO2. Model macromolecules and natural colloidal organic matter (COM) tested in the present study included dextran with different molecular weights, acid polysaccharides...
Laboratory adsorption experiments were conducted to examine the role of particle composition in the scavenging and fractionation of 234 Th and 233 Pa on nanoparticles in seawater. Nanoparticles with known chemical composition and size were used, including SiO 2 , CaCO 3 , Fe 2 O 3 , Al 2 O 3 and TiO 2 , representing biogenic opal,...
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