四国西部における未耕作土壌中希土類元素の分布

概要

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Non-cultivated soils derived from various parent materials were collected from the western part of Shikoku Ialand, Japan, The samples were digested with a mixture of nitric, perchloric and sulphuric acids and REEs in the extracts were determined by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Results were as follows. 1) Among 16 REEs analysed, 3 REEs (Yb, Sc and Y) were found in all samples and La, Ce, Nd, Eu, Gd, Dy and Lu were also found in almost all samples. 2) Oddo-Harkins' law is satisfied in distribution pattern of REEs in the soils studied. 3) La, Ce and Nd were higher in the soils derived from acidic rocks than from basic rocks. On the other hand, Sc and Gd were higher in the soils derived from basic rocks. 4) Heavy REE concentrations in solis were not affected by silicate concentrations in parent meterials. 5) In many soils analysed, REE concentrations increased with the depth of the layer, suggesting that REEs are released with the advance of soil formation. 6) Light REEs (La, Ce) often accumulate in surface layer. They might have affinity to organisms. 7) Above mentioned results are useful for the investigation of REEs behavior in the soil-plant-animal system.
日本地球化学会の論文
1991-03-20