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| Untersuchte Arbeit: Seite: 32, Zeilen: 2-17 |
Quelle: Li et al 2001 Seite(n): 663, 664, 668, Zeilen: 663:9-14; 664: left col. 9-15; 668:left col. 8-14.26-28 |
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| Li et al. (2001) used low concentration REEs (20, 40 and 80 μg Ce mL-1) as microfertilizer to study the kinetics of Ce(III) adsorption–desorption on four typical soils in China using the batch method with the radioactive nuclide 141Ce. The used soils were fluvo-aquic soil from north of China; Red earth from Jiangxi Province, south of China; Black soil from Heilongjiang Province, northeast of China; and Loess soil from Shaanxi Province, southwest of China. Results indicated that Ce(III) adsorption was rapid and nearly finished in less than 0.5 min. Desorption procedure was about completed in 1–30 min in the tested soils. Ce(III) desorption equilibrium times vary with different soils. The decreasing order of Ce(III) desorption equilibrium time was red earth > fluvo-aquic soil > black soil > loess soil; and the decreasing order of Ce(III) desorption amount is red earth ≫ fluvo-aquic soil > loess soil > black soil. CEC of soil was significantly and negatively correlated to Ce(III) desorption equilibrium times and desorption amounts. The desorption of Ce(III) in the four types soils was controlled by the diffusion processes. The amounts of Ce(III) desorption on different soils in the same time were different. The Elovich equation proved to be the best models for fitting the data of Ce(III) desorption reactions in fluvo-aquic soil and black soil; and the parabolic-diffusion equation was the best model in red earth and loess soil.
Li D C, Huang S B, Wang W H, Peng A (2001) Study on the kinetics of cerium(III) adsorption–desorption on different soils of China. Chemosphere Vol. 44: 663–669 |
[page 663]
Abstract The kinetics of Ce(III) adsorption±desorption on four typical soils in China has been studied by using the batch method with the radioactive nuclide 141Ce. Results indicated that Ce(III) adsorption was rapid and nearly finished in less than 0.5 min. Desorption procedure was about completed in 1±30 min in the tested soils. Ce(III) desorption equilibrium times vary with different soils. The amounts of Ce(III) desorption on different soils in the same time were different. The Elovich equation proved to be the best models for fitting the data of Ce(III) desorption reactions in fluvo-aquic soil and black soil; and the parabolic-diffusion equation was the best model in red earth and loess soil. [page 664] 2. Materials and methods 2.1. Soil samples Four types of soils that are common in China have been chosen as the samples to study the adsorption and desorption of Ce(III). They are fluvo-aquic soil from north of China; Red earth from Jiangxi Province, south of China; Black soil from Heilongjiang Province, northeast of China; and Loess soil from Shaanxi Province, southwest of China.
4. Conclusion [...] The decreasing order of Ce(III) desorption equilibrium time is red earth > fluvo-aquic soil > black soil > loess soil; and the decreasing order of Ce(III) desorption amount is red earth ≫ fluvo-aquic soil >loess soil > black soil. CEC of soil was significantly negative correlated to Ce(III) desorption equilibrium times and desorption amounts. [..] [...] The desorption of Ce(III) in the four types soils was controlled by the diffusion processes. |
Though the source is named right in the beginning it is not made clear that the text has been taken identically from the source. Nothing is marked as a citation. |
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