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• W2080482098 abstract "This study presents the results of ultrafiltration experiments (0.20 μm–300,000 Da–5000 Da–1000 Da) performed on natural rich-organic waters (30–40 mg l−1 of dissolved organic carbon) sampled in wetland area of Cameroon (Nsimi-Zoetele site). A very strong decrease in all cation concentrations (major and trace elements) except Si was observed after filtration. Speciation calculations using data available in the literature for metal–humic substance complexation observations suggest that ultrafiltration performed on this water source at a pH of 4.74 induces a very strong retention of cations only weakly bound to humic substances in the aqueous solution [Viers, J., Dupre, B., Polve, M., Schott, J., Dandurand, J.L., Braun, J.J., 1997. Chemical weathering in the drainage basin of a tropical watershed (Nsimi-Zoetele site, Cameroon): comparison between organic-poor and organic-rich waters. Chem. Geol., 140, 181–206]. To minimize this artifact, ultrafiltration must be performed at low pH (=3) or with the addition of high concentrations of a complexing metal (e.g., Lanthanum). The goal of these ultrafiltration experiments is to anticipate the affinity of several major and trace elements to form organo-metallic complexes with humic substances. Experiments using Sr and Ba isotopes at fixed ratios were entered in order to determine the exchangeable fraction of base cation. Natural Sr isotopic ratio (87Sr/86Sr) in different filtrates and retentates as well as isotopic ratios of Ba and Sr (86Sr/84Sr and 138Ba/135Ba) in spiked and filtered samples appear to remain constant. These results suggest that there is only one source of Sr in these natural waters and that it is present in an exchangeable form (i.e., free ion and/or complexed with organic matter). By analogy, we suppose that elements such as Ca or Mg are not present in organic or mineral colloids but in an exchangeable position. This is in agreement with the hypothesis of the filtration artifact. In the filtration experiment, performed at pH 3, more than 95% of Al, Ga, Fe, U, Th, Y and REEs, ≅50% of Cr and V, 25% of Cu, 10% of Co, and ≤5% of Ca, Mg, Na, K, Mn, Ba, Rb and Sr are complexed with organic material. According to the data gathered in this study and the results of speciation calculations, the order and the overall constants (log K) for the formation of metal–humate complexes are the following: Al, Ga, Fe, Th, U, Y, REEs (more than 7)≫Cr (5.5)≫Co (3)>Rb, Ba, Sr, Mn, Mg (≈2). These data are obtained for both low ionic strength and low metal concentrations. Using the filtration experiment performed with an addition of La, we observe that REEs appear to be complexed with humic substances via two types of site. The first site has a strong affinity for the REEs but is not abundant. So the complexation by this site will be important when the REEs concentration is low. The second type of site is much more abundant but has a much smaller affinity for the complexation of REEs. This site will dominate when the REEs concentration is high. The first site remains unassigned but the second should be related to the carboxylic functional groups." @default.
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• W2080482098 date "1999-07-01" @default.
• W2080482098 modified "2023-10-17" @default.
• W2080482098 title "Major and trace elements associated with colloids in organic-rich river waters: ultrafiltration of natural and spiked solutions" @default.
• W2080482098 cites W157600792 @default.
• W2080482098 cites W1921187991 @default.
• W2080482098 cites W1964112613 @default.
• W2080482098 cites W1964891114 @default.
• W2080482098 cites W1965820269 @default.
• W2080482098 cites W1966939135 @default.
• W2080482098 cites W1970893944 @default.
• W2080482098 cites W1972979147 @default.
• W2080482098 cites W1973785610 @default.
• W2080482098 cites W1974652161 @default.
• W2080482098 cites W1982122406 @default.
• W2080482098 cites W1983490813 @default.
• W2080482098 cites W1992689875 @default.
• W2080482098 cites W1993648066 @default.
• W2080482098 cites W1993679767 @default.
• W2080482098 cites W1996583819 @default.
• W2080482098 cites W1999111468 @default.
• W2080482098 cites W2006335382 @default.
• W2080482098 cites W2006456876 @default.
• W2080482098 cites W2013011235 @default.
• W2080482098 cites W2016912766 @default.
• W2080482098 cites W2025168964 @default.
• W2080482098 cites W2025213474 @default.
• W2080482098 cites W2029530860 @default.
• W2080482098 cites W2033379772 @default.
• W2080482098 cites W2035108492 @default.
• W2080482098 cites W2035304400 @default.
• W2080482098 cites W2040945682 @default.
• W2080482098 cites W2041321476 @default.
• W2080482098 cites W2045366746 @default.
• W2080482098 cites W2045442019 @default.
• W2080482098 cites W2047963517 @default.
• W2080482098 cites W2049946997 @default.
• W2080482098 cites W2050126402 @default.
• W2080482098 cites W2051210938 @default.
• W2080482098 cites W2051656270 @default.
• W2080482098 cites W2056816028 @default.
• W2080482098 cites W2059596938 @default.
• W2080482098 cites W2062251300 @default.
• W2080482098 cites W2062894349 @default.
• W2080482098 cites W2063335143 @default.
• W2080482098 cites W2066715378 @default.
• W2080482098 cites W2078281057 @default.
• W2080482098 cites W2082978327 @default.
• W2080482098 cites W2083888956 @default.
• W2080482098 cites W2086458013 @default.
• W2080482098 cites W2086467359 @default.
• W2080482098 cites W2087366334 @default.
• W2080482098 cites W2091251998 @default.
• W2080482098 cites W2100538742 @default.
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• W2080482098 cites W2152140275 @default.
• W2080482098 cites W2475612847 @default.
• W2080482098 cites W2504548809 @default.
• W2080482098 cites W2565429265 @default.
• W2080482098 cites W2566834820 @default.
• W2080482098 cites W4211011800 @default.
• W2080482098 cites W4246226059 @default.
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• W2080482098 doi "https://doi.org/10.1016/s0009-2541(99)00060-1" @default.
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