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Abundance of rare earth elements in rice paddy soils from three regions of Sri Lanka

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Abstract

Very few studies deal with the rare earth element (REE) content within paddy soil systems. This paper presents, for the first time, the distribution of REEs in paddy soils from three different regions in Sri Lanka. Seventy samples from the Kalutara and Kandy regions located in the Wet Zone and Anuradhapura region in the Dry Zone were selected for this study. ICP-MS measurements were performed on the soil samples to determine their respective REE concentrations. The sum content of all the REEs (ΣREE) in these three regions were 182, 186 and 132 μg/g, respectively. The mean concentrations for the 70 soil samples in µg/g were 35(La), 77 (Ce), 7.6 (Pr), 27.6 (Nd), 4.8 (Sm), 0.87 (Eu), 4.1 (Gd), 0.54 (Tb), 2.91 (Dy), 0.56 (Ho), 1.57 (Er), 0.21(Tm), 1.44 (Tb), and 0.23 (Lu). The chondrite-normalized REE patterns of the paddy soils from the three study areas were similar, which may be a reflection of comparable parent materials. Kalutara soils, which are richer in organic matter and kaolinite, showed a higher lighter REE content and lower heavy REE content with a more pronounced negative Eu anomaly with respect to the other regions. Whilst this may be a result of subtle differences in soil parent materials, it could also reflect secondary processes related to clay mineral and organic matter adsorption of REEs in paddy soils

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Acknowledgements

R.C. wishes to thank the Deutscher Akademischer Austausch Dienst (DAAD), Germany, for the award of a grant (2003). C.B.D. gratefully acknowledges a fellowship from the Alexander von Humboldt Stiftung, Germany. He also thanks Dr. U. Siewers and Mr. H. Lorenz of BGR, Hannover, for making the ICP-MS facilities available. Very special thanks are due to Drs. Fiona Fordyce and Chris Johnson of the British Geological Survey for providing us with the soil samples and important information of their earlier studies. Grateful thanks are also due to Dr. Barry Smith of the BGS for his comments and also for providing useful information on REE and health.

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Correspondence to Rohana Chandrajith.

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Chandrajith, R., Dissanayake, C.B. & Tobschall, H.J. Abundance of rare earth elements in rice paddy soils from three regions of Sri Lanka. Paddy Water Environ 2, 163–169 (2004). https://doi.org/10.1007/s10333-004-0055-2

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