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• W1995744862 abstract "Laboratory adsorption experiments were conducted to examine the role of particle composition in the scavenging and fractionation of 234Th and 233Pa on nanoparticles in seawater. Nanoparticles with known chemical composition and size were used, including SiO2, CaCO3, Fe2O3, Al2O3 and TiO2, representing biogenic opal, carbonate, metal oxides, and lithogenic particles, respectively. The results indicated that nanoparticles with the same size but different chemical compositions had different affinities for 234Th and 233Pa, giving rise to different partition coefficient (Kd) values. Compared to 234Th, log Kd values of 233Pa had a higher variability on different nanoparticles, ranging from 3.10 to 5.39. In general, the log Kd values for 234Th on CaCO3, Fe2O3, and Al2O3 were higher than those for 233Pa, while the opposite was true on SiO2 and TiO2 nanoparticles, resulting in a significant fractionation between 234Th and 233Pa during their adsorption on nanoparticle surfaces. Among the selected nanoparticles, Fe2O3 had the highest fractionation factor between 234Th and 233Pa (FTh/Pa) while SiO2 had the lowest, following the order of Fe2O3 > CaCO3 > Al2O3 > TiO2 > SiO2. In addition to the effect of chemical composition, the concentration of nanoparticles or micro-particles also significantly affected the partitioning of 234Th or 233Pa between dissolved and particulate phases, showing a strong particle concentration effect with a general decrease in log Kd values with increasing particle concentration. Interestingly, results from adsorption experiments with binary nanoparticles, containing both SiO2 and CaCO3, clearly demonstrated an increase in log Kd values of 233Pa with increasing SiO2/CaCO3 ratios of the adsorbent, but a decrease in the fractionation factor between 234Th and 233Pa. However, the enhanced adsorption of 233Pa on SiO2 nanoparticles or the increased log Kd value of 233Pa occurred only when the abundance of SiO2 reached 60% (in wt.) or higher. Thorium, on the other hand, was less sensitive to particle composition during its adsorption on nanoparticles in seawater. Thus, it seems that the Th/Pa ratios of oceanic particles could be largely controlled by the relative abundance of biogenic silica. Further studies are needed to examine the role of natural organic matter, which affects surface properties and chemical speciation of trace elements, in regulating the adsorption of radionuclides on nanoparticles." @default.
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• W1995744862 date "2014-05-01" @default.
• W1995744862 modified "2023-09-23" @default.
• W1995744862 title "Adsorption and fractionation of thorium and protactinium on nanoparticles in seawater" @default.
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• W1995744862 doi "https://doi.org/10.1016/j.marchem.2014.03.004" @default.
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