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| Untersuchte Arbeit: Seite: 29, Zeilen: 19-32 |
Quelle: Li et al 2001 Seite(n): 663, Zeilen: left col. 9-15-right col. 1-17 |
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| The REEs in generally used as fertilizers can increase crop production (Guo, 1988). Since the early 1980s the amount of REEs used in agriculture increased, reaching a few thousand tons each year and was applied over more than three million hectare up to 1998 in China (Guo, 1999). The fate of REEs used in agriculture has become a growing concern after large quantities of REEs accumulated in soil (Wang, 1991). It is very important, how REEs will be fixed and released and how the fixing and releasing rates will be used to study the bioavailability of REEs. It is generally accepted that metal concentrations in soil solution are most likely controlled by adsorption–desorption in soils. Therefore, the study on adsorption and desorption of REEs is very important. A lot of studies on the effect of soil mineral constituents and environmental conditions on the isotherm adsorption and desorption of exogenous REEs in soils have been done during past 10 years (Ran and Liu, 1993b; Chang and Zhu, 1996; Zhang et al. 1996). However, there are few reports that examined desorption, and even lesser reports that have measured desorption kinetics of REEs (cited from Li et al., 2001).
Chang J, Zhu W M (1996) Adsorption-desorption of rare earth elements on soils. Chin. J. Soil Sci. Vol. 2: 84 – 87 Guo B S (1988) Rare Earth Elements in Agriculture, Agriculture Science and Technology Press, Beijing Guo B S (1999) Recent research advance of rare earth in the field of biology. Chinese Rare Earths, Vol. 20 (1): 64 – 68 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 Ran Y, Liu Z (1993a) Adsorption and desorption of rare earth elements on soils and synthetic oxides. Acta Sci. Circumstantiae Vol. 3: 288 – 293 Ran Y, Liu Z (1993b) Chemical speciation of exogenous REEs in main types of soil of China. Journal of the Chinese Rare Earth Society, Vol. 14 (2): 31 – 35 Wang X R (1991) The perspective and review of environmental chemistry of rare earth elements. Environ. Chem. Vol. 10 (6): 73–74 Zhang L G, Zhu W M, Zhang J Z, Chen Z Y (1996) Determination of RE adsorption, desorption and diffusion by isotopic tracer. J. Chinese Rare Earth Soc. Vol. 14 (3): 249 – 253 |
One important application of REEs in China is in agriculture. The REEs in generally used as chemical fertilizer can increase the crop production (Guo, 1988). Since early 1980s the amount of REEs used in agriculture has increased, reaching a few thousand tons each year and was applied over more than three million hectare up to 1998 in China (Guo, 1999). The fate of REEs used in agriculture has become a growing concern after large quantities of REEs accumulated in soil (Wang, 1991). It is very important, how REEs will be fixed and released and how the fixing and releasing rates will be used to study the bioavailability of REEs. It is generally accepted that metal concentrations in soil solution are most likely controlled by adsorption-desorption in soils. Therefore, the study on adsorption and desorption of REEs are very important.
A lot of studies on the effect of soil mineral constituents and environmental conditions on the isotherm adsorption and desorption of exogenous REEs in soils have been done during past 10 years (Ran and Liu, 1993; Chang and Zhu, 1996; Zhang et al., 1996). However, there are few reports that examined desorption, and even lesser reports that have measured desorption kinetics of REEs. Chang, J., Zhu, W.M., 1996. Study on adsorption and desorption of rare earth in soils. Chinese J. Soil Sci. 27 (2), 84-87. Guo, B.S., 1988. Rare Earth Elements in Agriculture. Agriculture Science and Technology Press, Beijing. Guo, B.S., 1999. Recent research advance of rare earth in the field of biology. Chinese Rare Earths 20 (1), 64-68. Ran, Y., Liu, Z., 1993. Adsorption and desorption of rare earth elements on soils and synthetic oxides. Acta Sci. Circumstantiae 13 (3), 288-294. Wang, X.R., 1991. The perspective and review of environmental chemistry of rare earth elements. Environ. Chem. 10 (6), 73-74. Zhang, L.G., Zhu, W.M., Zhang, J.Z., Chen, Z.Y., 1996. Determination of RE adsorption, desorption and diffusion by isotopic tracer. J. Chinese Rare Earth Soc. 14 (3), 249-253. |
Though the source is named 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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