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- W2357363119 abstract "The kinetic characteristics of aluminum release in variable charge soils under H+and organic acids were studied by using the flow-stirred method.The results showed that the concentration of aluminum released under pH 3.5 simulated acid rain was about 15～40 μmol/L in red and yellow soils.The initial fast reaction of aluminum release could be described to exchangeable and organic complexing Al, while the following slow reaction to dissolution of readily weatherable Al-bearing minerals.During 0～300 min, the concentration of effluent Al was about 1～5 μmol/L and effluent pH value was above 4.5 in latosolic red soil and latosol.Buffering reaction to H+could be cation exchange, specific adsorption of to release OH-for neutralizing H+in the solution, and surface protonation of soil minerals.While the effluent pH was lower than about 4.5, dissolution of Al-bearing minerals in soils was dominant mechanism of Al release.The concentration of aluminum released under pH 3.5 solution of different organic acids was 20～75 μmol/L and 70～150 μmol/L in latosol and in red soil at initial stage, and then decreased to 10～20 μmol/L and 20～30 μmol/L, respectively.The mechanism of aluminum release was apparent that organic ligand could be adsorbed and promoted dissolution of Al-bearing minerals.Secondly, the surface protonation of minerals can be covered by the adsorption of organic ligands by the soil, resulting in the decrease of solution pH value and then the increase of acidic dissolution of aluminum.Thirdly, the formation of Al-ligands complexion may increase the amount of Al release.The capability of organic acids in dissolving aluminum was in the sequence of citric acid tartaric acid malic acid, which may be dependent on complexion power of Al-ligands." @default.
- W2357363119 created "2016-06-24" @default.
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- W2357363119 date "2006-01-01" @default.
- W2357363119 modified "2023-09-27" @default.
- W2357363119 title "Kinetics of aluminum release in variable charge soils under H~+ and organic acids" @default.
- W2357363119 hasPublicationYear "2006" @default.
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