Pedosphere 7(1): 25--30, 1997
ISSN 1002-0160/CN 32-1315/P
©1997 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Water-soluble rare earth elements in some soils of China
ZHU Jian-Guo1, ZHANG Ya-Li1, SUN Jun2, S. YAMASAKI3 and A. TSUMURA3
1 LMCP, Institute of Soil Scienec, Academia Sinica, Nanjing 210008 (China)
2 25th Laboratory, Institute of Metallurgy, Academia Sinica, Shenyang 110015 (China)
3 National Institute of Agro-Environmental Sczence, Tsukuba 305 (Japan)
      Water-soluble rare earth elements (WSREEs) of four typical soil profiles in China were determined by using a high-resolution inductively coupled plasma mass spectrometer. Results showed that the contents of WSREEs decreased from upper layer to lower layer of soils in the southern part of China with a high rainfall and low pH but increased for soils in the northern part of China with a low rainfall and relatively higher pH. Contents of WSREEs in soils were lower than 100 μg kg-1 in most cases, and varied greatly with both different soils and different layers of the same profile. The highest content was 2816.3 μg kg-1 but the lowest was 17.6 μg kg-1 only. The content of individual rare earth lement (REE) in the soil solution also varied greatly with the highest one ranging from 8.4 to 1373 μg kg-1 for Ce and the lowest one from 0.05 to 4.48 μg kg-1 for Lu. The sum of WSREEs in the first soil layers ranged from 121.5 to 345.6 μg kg-1. Great variations existed among ratios of REEs extracted with water to the total REEs of soils, ranging from 0.02×10-3 to 13.2×10-3. But as the upper layer was considered, the ratio showed only a small difference, ranging from 0.79×10-3 to 1.69×10-3.
Key Words:  rare earth element, soil profiles, ICP-MS
Citation: Zhu, J. G., Zhang, Y. L., Sun, J., Yamasaki, S. and Tsumura, A. 1997. Water-soluble rare earth elements in some soils of China. Pedosphere. 7(1): 25-30.
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